Mech Paper II

8/3/2019 Mech Paper II

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A~(DO NOT OPEN THis TEST BOOKLET UNTIL YOU ARE ASKED TO DO SO)T.R.C. : P-RSR-L-ZRB Test Booklet Series

Serial No. [ 37141 1 TEST BOOKLETMECHANICAL ENGINEERING

. Paper-II( Time Allowed: Two Hours ) (Maximum Marks: 200)

INSTRUCTIONS1. IMMEDIATELY AFTER THE'COMMENCEMENT OF THE EXAMINATION, YOU SHOULDCHECK THAT THIS TEST BOOKLET DOES NOT HAVE ANY UNPRINTED OR TORNOR MISSING PAGES OR ITEMS, ETC. IF SO, GET IT REPLACED BY A COMPLETETEST BOOKLET. ...2. E~CODE CLEARLY THE TEST BOOKLET. SERIES A, B, C OR DAS THE CASE MAY

BE IN THE APPROPRIATE PLACE IN THE ANSWER SHEET.3. You have to enter your Roll Number on the Test [ ]Bookle~ in the Box provided alongside. DO NOT

write anything else on the Test Booklet. ..._. --'_4. Thi"s Test Booklet contains 120 items (questions). Each item comprises four responses(answers). You will select the response which you want to mark on the Answer Sheet.In case you feel that there is more than one correct response, mark the response which you

consider the best. In any case, choose ONLY ONE response for each item.5. You have to mark all your responses ONLY on the separate Answer Sheet provided.See directions in the Answer Sheet.6. All items carry equal marks.7. Before you proceed to mark in the Answer -Sheet the response to various items in the TestBooklet, you have to fill in 'some particulars in the Answer Sheet as per instructions sentto you with your Admission Certificate.8. After you have completed filling in all your responses on the Answer Sheet and theexamination has concluded, you should hand over to the Invigilator only tile Answer Sheet.You are permitted to take away with you the Test Book1et.9. . Sheets for rough work are appended in the Test Book1et at the end.10. Penalty for wrong answers:THERE WILL BE PENALTY FOR WRONG ANSWERS MARKED BY A CANDIDATEIN THE OBJECTIVE TYPE QUESTION PAPERS. .

(i) There are four alternatives for the answer to every question. For each question forwhich a wrong answer has been given by the candidate, one-third (033) of the marksassigned to that question will be deducted as penalty.(ii) If a candidate gives more than one answer, itwill be treated as a wrong answer evenif one of the given answers happens to be correct and there will be same penalty asabove to that question. ,(iii) If a question is left blank, i.e., no answer is given by .the candidate, there will be

DO penalty for that question.( DO NOT OPEN THIS TEST BOOKLET UNTIL YOU ARE ASKED TO DO SO)


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1. Total number of instantaneous centers ofrotation for a mechanism having n links IS ;

ntn 1)(a) 2nC b ) 2

(c) nC d } n

2. Consider the following statementspertaining to an example for a cylindricalpair :1c Piston and cylinder of an Ie engine2. Shaft supported by a foot step bearing3. Doctor's injection syringe4. A screw driver operating on a screwWhich of these statements are correct?(a) 1 and 4(b) 2 and 3(c) 1 and 3(d) 3 and 4

3 c The number of degrees of freedom of anepicyclic gear train is .(a) Zero(b) One(c) Two(d) Three

4. The advantages of involute profile overcycloidal are given below, Which of theseis N OT correct '?(a) The interference is inherently absent in

the involute system(b) In the involute system, the pressureangle I S constant from commencement

to end of engagement(c) The straight teeth of the basic rack for

the involute profile admits of simpletools

(d) The profile for the flank and faceis a single curve in the involute system

5. Flywheel absorbs energy during thoseperiods of crank rotation when '(a) The twisting moment i s , greater than

the resisting moment(b) The twisting moment is equal to the

resisting moment(c) The twisting moment is less than the

resisting moment(d) The load on the engine falls

6. Introduction of the flywheel in a rotatingsystem smoothens ;(a) The bending moment on the rotating

shaft(b) The twisting moment on the shaft(e) The bending stress on the shaft(d) The axial force along the shaft

7. A four stroke six cylinder m line enginesymmetrical about centre hne can bebalanced for :(a) Primary inertia forces and couples only(b) Primary and secondary mertia forces

only(c) Secondary inertia forces and couples

only(d) All forces and couples

8. Given below arc four Vee twin engines withdifferent included angles between cylinderaxes. Which one of these engines can becompletely balanced for primary forces b)attaching a single revolving mass oppositeto the crank pin ?(a) VOCI: 45 twin engine(b) Vet: 90 twin engine(c) Vet: 60 twin engine(d) Vee 120~'win engine

9. Large field guns WhICh come to initialposition after tiring in shortest possible umeare:(a) Lnder damped(b) Critically damped(c) Over damped(d) Un-damped

2 (Contd.)


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10. Which of the following type of viscousdamping will give periodic motion to thevibrating body?1. Under damping2. Critical damping3. Over damping(a) 1only(b) 2 only'(c) 3 only'(d) 1 and 2

11: Consider the following statements.Transmissibility of vibrations :

1 , Is more than 1, when ~ < .fi(0.n 2. Is less than 1, when ~ > J2

(On

3. Increases as the damping is increasedWhich of these statements are correct?(a) 1,2 and 3(b) 1 and 2 only(e) 2 and 3 only(d) .1 and 3 only

12. Rayleigh's method of computing the, fundamental natural frequency is based on:(a) . Conservation of energy-(b) Conservation of 1l)-omentum(c) Conservation of masses.. (d) Laws of statics

13. In hydrodynamic journal bearings, if the"clearance ratio is halved then the.Sommerfeld number S and the coefficientof friction J .l will change as :(a) S becomes double and ~ is halved(b) . S becomes four times and J .l is doubled(c) S becomes four times and J . l is halved(d) S becomes double and J . l is also

doubled

14. A rope has been designated as 6x'19. Thenumbers 6 and 19 respectively stand for:. ,(a) Rope diameter and the number of wires(b) . Rope diameter and the number of

strands(c) Number of strands and the number ofwires(d) Number of wires and the number of

strands.15. If there are nl discs on the driving shaft andn, discs on the driven shaft in a multi-plate

clutch, then the number of pairs of contactsurfaces is : .(a) , +~l .(b) nl + }12 - 1(c) nl + n2 - 2(d) nl + T 1 2 + I

16. Consider the following statementspertaining to V belts in powertransmission :1. Standard V belts are available in 7 sizes

of cross section A to G2. Standard V belts are available in 5 sizes

of cross section A to E3. Standard V belts are available in 5 sizes'

of cross section A to E with A havinglargest cross section

4. I' The included angle for the belt groovein usually around 35.

Which or these statements are correct?(a) 1only(b) 2 and 4(c) 3 and 4

. (d) I and 417. An axle is a machine part that is subjected

to :(a) Transverse loads and bending moment(b) Twisting moment only .(c) Twisting moment and axial load(d) Bending moment and axial load

3 . (Contd.)


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18. In a bolt of uniform strength: 22.(a) Nominal diameter of thread is equal tothe diameter of shank of the bolt

(b) Nominal diameter of thread is largerthan the diameter of shank of the bolt

(c) Nominal diameter of thread is Jess thanthe diameter of shank of the bolt

(d) Core diameter of threads is equal to thediameter of shank of the bolt

19. Interference fi t joints are provided for:(a) Assembling bush bearing in housing(b) Mounting heavy duty gears on shafts(c) Mounting pulley on shafts(d) Assembly of flywheels on shaft

20. When a journal rotates in anticlockwise 23.direction at high speed in a bearing havingadequate supply of lubricant, it wi1l be :(a) Pushed to the left ufthe bearing centre

and is likely to have no metal contactwith the bearing

(b) Resting just below the bearing centrewithout making metal to metal contact

(c) Pushed to the right of the bearing centreand make no metal to metal contact

(d) Running concentric with the bearingcentre and make no metal to metal 24.contact

In wire ropes which one of the followingstatements is correct ?(a) Bending stress is directly proportional

to tne wire diameter and inverselyproportional to the sheave diameter

(b) Both fatigue and wear are due to thetensile stress on the wires bearingagainst the sheave

(c) Bending stre s s is inverselyproportional to the wire diameter anddirectly proportional to sheavediameter

(d) Both fatigue and wear are due to shearstress on the wires bearing against thesheave

4

!4 - q ~ 1 4 P .l_ --_ -._ . .... r Pt

C' qD .i-""j()(")[')(')( ~ 1 . -- - - . ---- _. .1

A compound fillet welded joint is loadedby P as shown. The maximum shearingstress occurs at point ~(a) A and D(b) Band D(c) A only(d) C onlyA fillet weld is loaded parallel to its length Iby a load P. [fthe weld leg is h. the averageshear stress on the throat area is :

P(a) hi

p(b) .. _--05 hi2P(c) hi1414 P(d) hi

Bevel gears having equal number of teethand equaJ pitch ang le s connect twoorthogonally intersecting shafts. This systemof gears is known as :(a) Crown gears(b) Hypoid gears(c) Worm gears(d) Mitre gears

25. A solid steel shaft of diameter d and length/ is subjected to twisting moment I. Anothershaft B of brass having same diameter d,but length 1 1 2 is also subjected to the samemoment. If shear modulus of steel is twotimes that of brass. the ratio of the angulartwist of steel to that of brass shaft is :(a) 1: 2(b) 1: 1(c) 2: 1(d) 4 7 1

(Contd.)


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26. A high pressure angle fo r spur gears leads to :(a) Minimum axial thrust(b) Greater backlash(c) More interference(d) Wide base and stronger toothMatch List-I with List-II and select thecorrect answer using the code given belowthe lists: .

30. 'I

27.

List-I ua.ttA. Unwin's formula 1. Bearing'S. Wahl factor 2 . RivetsC. Reynold's equation 3 . GearsD. Lewis form factor 4 . SpringsCode:

A B C D(a) 3 4 2(b) 2 1 4 3(c) 3 4 1 2(d) 2 4 1 3

28. Antifriction bearings are normally used inshafts:1. Running at 20,000 to 40,000 rpm2. Running at speeds up to 6,000 rpm3. Of diameters up to 500 mm4. Of diameter more than 500 mm(a) 1 and 3(b) 2 and 3(c) 2 and 4(d) 1 and 4

29. t Crf-_-., 10kNA ~ I m i 2 mA prismatic bar, as shown in figure issupported between rigid supports. Thesupport reactions will be :(a) RA = . I f kN and RB = 2~ kN(b) R A = 2 3 kN and ~ = I f kN(c) RA = 10 kN and RB = 10 kN(d) R A = 5 kN and ~ =5 kN

/~.,I /~ /550 .....:::=-+---+It x

&)A rectangular strain rosette, shown infigure, gives following readings in astrain measurement task, E) = 1O O O x 10-6,E2 = 800x 10~6 and E3 = 600xl0-6. Thedirection of the major principal strain withrespect to gauge 1 is :(a) 0(b) 15(c) 30(d) 45

31. 1 a piece of material neither expands norcontracts in volume when subjected tostresses, then the Poisson's ratio must be :(a) Zero(b) 025(c) 033Cd) 0 '5

32. r = 400 MPa

rWhat are the normal and shear stresses onthe 450 planes shown ?(a) 01 =-G2=400 MPa and 't = 0(b) 0') = 02 =400 MPa and t=0(c) 0') =0'2; =-400 MPa and 't=0(d) 01 =02 = 't = 200 MPa

5 (Contd.)


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33. Materials which show direction dependentproperties art: called :(a) Homogeneous(b) Viscoelastic(c) Isotropic(d) Anisotropic

.34 . If a rod expands freely due to heating, it willdevelop(a) Bending stress(b) Thermal stress(c) No stress(d) Compressive stress

35, Match t.ist-I with List-II and select thecorrect answer using the code given belowthe lists'

List-I ua.ttA. Subjected to bending 1. Triangle

moment at the endof a cantilever

B . Cantilever carrying 2. Cubicuniformly distributed Parabolaload over the wholelengthC. Cantilever carrying 3. Parabolalinearly varying loadfrom zero at the freeend to maximum atthe supports

D. A beam having load 4. Rectangleat centre and supportedat the: ends

Code:A B

(a) 1 2(b) 4 3(c) I 3(d) 4 2

C 03 422 43

36. A Tvsecticn beam is simply supported andsubjected to a uniform distributed load overits whole span. Maximum longitudinalstress in the beam occurs at :(a) Top fibre of the flange(b) The junction of web and Bange(e) The mid-section of the web(d) The bottom fibre of the web

37. For the two shafts connected in parallel :(a) Torque in each shaft is the same(b) Shear stress in shaft is the same(c) Angle of twist of each shaft is the same(d) Torsional stiffness of each shaft is the

same38. Two equal lengths of steel wires of the same

diameter are made into two springs SI andS 2 of mean diameters 75 mm and 60 mmrespectively The stiffness ratio of 81 to S,1S :

(a) (~ f(b) ( ~ r(c) (~~ f(d) ( ~~ r

39. Solid material chemical bonds are :(a) Ionic. molecular and fusion(b) Covalent. fusion and fission(c) Ionic, covalent and molecular(d) Fission, molecular and ionic

40. Cleavage fracture is a form of ,(a) Brittle fracture(b) Ductile fracture(c) Elastic fracture(d) Viscoelastic fracture

6 (Contd.)


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41. Match List-I with List-Il and select thecorrect answer using the code given belowthe lists:

List-IA. Alpha ironB. ZincC. GlassD. CopperCode:

ABC 0(a) 1 4 3 2(b) 2 4 3 1(c) 1 3 4 2(d) 2 3 4 1

List-II1. FCC2. BCC3. HCP4. Amorphous

42. In a triclinic unit cell :(a) a= J 3 = y =90(b) a=J 3 = 90, Y= 1200(c) a = 1 3 = 90 :;t: Y(d) a* J 3 * y * 90

43. Structure of common glass is :(a) Amorphous(b) Partially crystalline(c) Fully crystalline(d) None ofthe above

44. Liquid + solid (1) on cooling converting intosolid (2) reaction is known as :(a) Eutectoid reaction(b) Eutectic reaction(c) Peritectic reaction(d) Peritectoid reaction

45. Match List-I with List-II and select thecorrect answer using the code given belowthe lists:

List-I List-IlA. System 1. Free energy is a

minimum2. Chemical ele-

ments or chemi-cal compounds

C. Phase equili- 3. Consists of solids,brium liquids or gases or

B. Phase

their combinationD. Components 4. Homogeneous por-

tion of a systemthat has uniformphysical charac-teristics

Code:A B

(a) 2 1(b) 3 1(c) 2 4(d) 3 4

C D4 34 2

32

46. Babbit is an alloy of :(a) Sn, Cu, Sb and Pb(b) Sn and Cu(c) Sn, Cu and Pb(d) sn, Cu and Sb

4 7. Resilience of a material becomes importantwhen it is subjected to :(a) Fatigue(b) Thermal stresses(c) Shock loading(d) Pure static loading

7 (Contd.)


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48. During tensile testing it has been observed 51. The relationship between total freezing timethat for some material the deformation is t, volume of the casting V and its surfacefully recoverable and time-independent, but area A, according to Chvorinov's rule is :does not obey Hook's Jaw. The material is: t=K(-X)a) Elastomer (a)(b) Rubber (b) t = K (0)(c) Polymer

t ~K (fd) Aluminium alloy (c)49, Match List-I with List-Il and select the 1 = K ( Y fcorrect answer using the code given below (d) A

the lists: Where K is a constantusi-s ua.nA. Copper Corrosion 52. Which one of the following statements isB . Nickel 2. Demagneti zation NOT correct for normalizing?C. Manganese 3. Non sparking (a) It is often applied to castings to relieveD. Vanadium 4. Deformation restriction stresses

at high temperature (b) It increases strength of medium carbonCode: steel to some extent

A B C 0 (c) Better surface finish can be obtained(a) I 2 3 4 in machining(b) 4 3 2 1 (d) It increases grain size(c) 3 2 4(d) 4 2 - ; 53. Whiskers' are:

50. Match List-I with List-Il and select the (a) Very thin metallic particlescorrect answer using the code given below (b) Very thin single crystalsthe lists: (c) Very thin polycrystals

List-I usi-tt (d) Fiber particles of aspect ratio lessA. Elasticity I. Deform non elastically than 10without fracture

B. Malleability 2 lln:iergo plastic deforrra- 54. Injection moulding process used to producetion under tensile load thermoplastic matrix composites with fibre

C. Ductility . 3 Un:fergoplastic defonm- reinforcement normally gives;tion under cornpres- (a) Short fibre compositessive load (b) Two layer structure composites

D. Plasticity 4 Return to its original (c) Continuous fibre compositesshape on unloading (d) Single layer compositesCode "

A B C 0 55. Aluminium Bronze is also known as :(a) 2 3 4 (a) Muntz metal(b) 4 2 3 (b) White metal(c) 1 3 2 4 (c) Duraluminiurn(d) 4 3 2 l (d) Imitation gold

8 (Contd.)


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56. Match List-I with List-II and select the 61. Which one of the following is the majorcorrect answer using the code given below alloying element in lnvar ?the lists: (a) Aluminium

List-/ List-Il (b) NickelA. Gun metal 1. Worm wheel (c) VanadiumB. Phosphor bronze 2. Cylinder block (d) CopperC. Gray cast iron 3 . Piston 62. In the designation of Aluminium castingD. Al alloy 4. Bushings A514'O 14 indicates:Code: (a) Aluminium purity

A B C D (b) Aluminium content(a) 3 1 2 4(b) 4 1 2 3 (c) Percentage of alloy element(c) 3 2 1 4 (d) Magnesium content(d) 4 2 1 3 63. Columbium is a :

57. Lead is widely used in : (a) Nuclear material(a) Transformers (b) Automobile material(b) Switch gear (e) Film material(e) Galvanized pipes(d) Batteries (d) Foam material

58. Kevlar Epoxy composite is widely used in : 64. Consider the following statements ;(a) Automobiles 1. Any metal will require some time to(b) Aerospace undergo complete plastic deformation(e) Navy particularly if deforming metal has to(d) Interior decoration fill cavities and comers of small radii.

59. Windows of aeroplane are made of: 2. For larger work piece of metals that can(a) PVC retain toughness at forging temperature(b) PTFE it is preferable to use forge press rather(c) PMMA than forge hammer.(d) PEEK (a) 1 and 2 are correct and 2 is the reason60. Admirality Brass is used for : for 1(a) Condenser tubes (b) 1 and 2 are correct and 1 is the reason(b) Rivets for 2(c) Piston rods (c) 1 and 2 are correct but unrelated(d) Utensils (d) 1 only correct

9 (Contd.)

)


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65. Which of the following processes belong toforging operation ?1. Fullering2. Swaging3. Welding(a) 1 and 2 only(b) 2 and 3 only(c) 1 and 3 only(d) I.2and3


List-lConnecting rodsPressure vesselsMachine tool bedsCollapsible tubes

uo.n1. Welding2. Extrusion3. Forming4. Casting

A.B .C.D .Code:

A 8 C 0(a) 2 t 4 3(b) 3 1 4 2(c) 2 4 1 3(d) 3 4 1 267. Consider the following statements:1. Hot chamber machine is used for

casting zinc, tin and other low meltingalloys

2" Cold chamber machine is used for diecasting of ferrous alloys

3. Rapid cooling rate in die castingproduces high strength and quality inmany alloys

Which of these statements are correct?(a) 1. 2 and 3(b) I and 2 only(c) 2 and 3 only(d) 1 and 3 only

,

68. Consider the following advantages of diecasting over sand casting:1. Rapidity of the process2. Smooth surface3. Strong dense metal structureWhich of these advantages are correct?(a) 1,2 and 3(b) I and 2 only(c) 2 and 3 only(d) 1 and 3 only

69. The proper sequence of investment castingsteps is :(a) Slurry coating - Pattern melt out ,--

Shakeout ,,-Stucco coating(b) Stucco coating - Slurry coating ~-

Shakeout -- Pattern meJt out(c) Slurry coating Stucco coating ~

Pattern melt out, Shakeout(d) Stucco coating -- Shakeout -,Slurry

coating -Pattern melt out70. The methods of casting for producing

ornamental pieces are :(a) Slush and gravity casting(b) Pressed and slush casting(c) Gravity and semi permanent mould

casting(d) Semi permanent mould and pressed

casting71. In light metal castings. runner should be so

designed that:1 It avoids aspiration2, It avoids turbulence3. The path of runner is reduced in area

so that unequal volwne of flow througheach gate takes place(a) 1 and 2 only(b) 1 and 3 only(c) 2 and 3 only(d) 1,2 and 3

10 (Contd.)


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72. During plasma arc welding of aluminium. 75. Match List-I with List-Il and select theimproved removal of the surface oxide from correct answer using the code given belowthe base metal is obtained with typical the lists:polarity of : List-/ . List-I/(a) DC straight A. Laser beam 1. Can be applied for

welding welding of refractory(b) DC reverse metals like niobium,(c) AC potential tantalum, molybdenum(d) Reverse polarity of phase of AC and tungstenB. Electron beam 2. A sound and cleanpotential welding welded joint is crea-

ted due to rubbing of73. The welding process in which bare wire is two parts against each

used as electrode, granular flux is used and other with adequatethe process is characterized by its high speed speed and pressurewelding, is known as : producing intense(a) Shielded arc welding heat raising tempera-ture above melting(b) Plasma arc welding point(e) Submerged arc welding C. Ultrasonic 3. Clean heat source

_(d) Gas metal arc welding welding created much awayfrom job, a narrowspot is heated, work74. Consider the following statements. chamber operates in

Cast iron is difficult to weld, because of ; a high vacuum1. Low ductility D. Friction 4. Clean heat source,welding very quick heating.2 . Poor fusion very small focal spot,3. Tendency to crack on cooling no vacuum chamberWhich of these statements are correct ? is requiredCode:(a) 1,2 and 3 A B C D(b) 1 and 2 only (a) 4 3 1 2

(b) 2 3 1 4(c) 2 and 3 only (c) 4 1 3 2(d) 1 and 3 only (d) 2 1 3 4

11 (Contd.)


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76. Cold-cracking in steel weldments depends on:1. Carbon equivalent2. Heat input3. Effective thickness4. Hydrogen content in weld pool(a) 1,2 and 3 only(b) 1.2 and 4 only(c) 2,3 and 4 only(d) 1,2, 3 and 4

77. In Norton type feed gearbox for cuttingWhitworth standard threads with a standardTPI Leadscrew, power flows from :(a) Spindle to Tumbler gear to Norton

cone to Meander drive to Leadscrew(b) Spindle to Norton cone to Tumblergear to Meander drive to Leadscrew(c) Spindle to Tumbler gear to Meander

drive to Norton cone to Leadscrew(d) Spindle to Norton cone to Meander

drive to Tumbler gear to Leadscrew78. Match List-l with List-Il and select the

correct answer using the code given belowthe lists;

LiSl-1A, LatheB. Shaper

ua.tt1. Flute2. Universal

indexing3. Leadscrew4, Rocker arm

C. Drilling machineD. Milling machineCode:

ABC D(a) 2 4 3(b) 3 4 2(c) 2(d) 3 1431 4 2

79. Trajectory of a robot means:(a) Path traced by the end effector(b) Kinematics of Robot(c) Robot joints(d) Robot programming

80. Typical coolants used for machiningaluminium are :1. Kerosene oil2. Soda water3. Air4. Paraffin oil(a) I, 2. 3 and 4(b) 2 and 3 only(c) 1 and 2 only(d) 3 and 4 only

81. The instrument or device used to measurethe cutting forces in machining is :(a) Tachometer(b) Comparator(c) Dynamometer(d) Lactometer

82. In a transportation problem, how is anunacceptable transportation route handled ?(a) By giving it a cost of zero(b) By carrying an extremely high cost(c) By introducing a dummy destination(d) By introducing a dummy origin

83. Consider the following characteristics:It is very sensitive to small movementsin the dataThe technique is simpleThe method is affected by the personalprejudice of the people

Which of these characteristics of movingaverage method of forecasting are correct?(a) 1,2 and 3(b) 1 and 2 only(c) 2 and 3 only(d) 1 and 3 only

l.

2 .3 .

12 (Contd.)


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84. The break-even point can be lowered by: 89. Consider the following terms used to study(a) Increasing the fixed costs the functions of the material:(b) Increasing the variable costs 1. Use value(c) Decreasing the slope of the income line,Cd) Reducing the variable cost 2. Esteem value85. The under capacity of a manufacturing 3. Exchange value

company is preferred when :(a) The rate of obsolescence of the plant 4. Scrap valueand equipment is high Which of these are used to identify in the(b) The time required to add capacity is long value engineering approach ?(c) The fixed cost of the capacity is notvery high (a) 1.2.3 and 4(d) Shortage of the products affects the (b) 1.3 and 4 onlycompany86. Which one of the following statement is Cc) 1,2 and 3 onlyNOT correct with reference to the purposes (d) 2, 3 and 4 onlyand effects of rake angle of a cutting tool ?

(a) To guide the chip flow direction 90. Which of the following method is NOT used(b) To reduce the friction between the toolflanks and the machined surface for obtaining the initial basic feasible(c) To add keenness or sharpness to the solution in transportation problems?cutting edge (a) North west comer method(d) To provide better thermal efficiency87. The component reliability is usually (b) Least cost entry methodmeasured by: reliability (CR), failure rates (c) Vogel's approximation method

(FR) and mean time between failures (d) MODI method(MTBF). The MTBF is :(a) Number of failures/unit-hours of -91. Match List-I with List-Il and select theoperation correct answer using the code given below(b) Unit-hours of operation/number of the lists:failures(c) Number of failures/number of tested List-I ua-u(d) Number of failures x unit-hours of A. R 1. Ranges

operation B. P 2. Number of defects/unit88. A basic feasible soLution of an m x n C. c 3. Number of defects

- transportation problem is said to be non D. u 4. Fraction defectives- degenerate if the allocations are in Code:independent positions and starting basicfeasible solution contains exactly following A B C Dnumber of individual allocations: (a) 1 4 3 2(a) m+n (b) 2 4 3 1(b) m x n (c) 1 3 4 2(c) m+n-l(d) m+n+ 1 (d) 2 3 4 1

13 (Contd.)


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92. An unbound solution of a linearprogramming problem is reflected in thesimplex method, when:(a) Ali the ratio of 'right hand sides' to

coefficients in key column becomenegative(b) All the ratios of right hand sides tocoefficients in key columns becomezero

(e) A ll right hand sides become negative(d) All right hand sides become zero

93. When the ordering cost is increased to4 times. the EOQ will be increased to ;(a) 2 times(b) 3 times(c) 8 timesC d ) Remain same

94. For a single server queue, the mean arrivalrate is equal to 8ibr and the mean servicerate is 12/hr. The expected number inwaiting Iine is equal to(a) 05(b) ]-33(e) 2(d) 3

95. In the queuing theory. if the arrivals in asingle server model follow Poissondistribution, the time between arrivals willfollow a ,(a) Gamma distribution(b) Exponential distribution(c) Binomial distribution(d) Weibull distribution

96. Which of the following are the advantagesof MOS devices over bipolar devices?1. Easy to fabricate2 . Allows higher bit densities3. Cost effective4 . Operational speed.(a) 1,2,.3 and 4(b) 1. 2 and 3 only(c) 2, 3 and 4 only(d) 1. 3 and 4 only

9 7_ The number of RAM chips of size (256 kx 1)required to build a 2 Mbyte memory is :(a) 16(b) 32(c) 64(d) 128

98. Refreshing circuit is required In :(a) ROM(b) Static RAM(c) Dynamic RAMCd) A ll of the above

9 9 . Which of the following statemenus) is/arecorrect?L Bus is a group of wires carrying

information2. Bus can carry data3. Bus cannot carry address4. A bus can be shared by more than onedevice(a) 1,2,3 and 4(b) 1. 2 and 3 only(e) t 2 and 4 onlyCd) 2. 3 and 4 only

14 (Contd.)


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100. In flowcharting, the connector symbol is a :(a) Parallelogram(b) Square(c) Diamond(d) Circle

101. Which of the following are the advantagesof flowchart ?I . A flowchart is independent oflanguage2. It is easy to develop a program with

flowchart3. If there are any changes in the program.

it is very easy to make changes(a) 1 and 2 only(b) 1 arid 3 only(c) 2 and 3 only(d) 1,2 and 3

102. In flowcharting, a parallelogram would beused to represent :(a) Getting a keyboard entry from the user(b) The begirming of the flowchart(c) A decision point that determines which

of two branches to follow(d) Amathematical calculation

103. USM has good machining performance for:(a) AI(b) Steel(c) Super alloys(d) Refractory material

104. Consider the following statements:1. Create a database al ias2. Create the tables needed3. Create indexes4. Create a directory for the tablesWhat is the correct sequence of order forcreating a new database in dBase ?(a) 4-2-1 and 3(b) 3-1-2 and 4(c) 4-1-2 and 3(d) 3-2-1 and 4


List-/ ua.ttA. Worksheet 1. dBase IIIB . Records 2 . C languageC. Pointers 3 . FORTRAND. Compiler 4 . Lotus 1-2-3Code:

A B C D(a) 4 2 1 3(b) 3 2 1 4(c) 4 2 3(d) 3 1 2 4

106. High energy rate fanning process used forforming components from thin metal sheetsor deform thin tubes is :(a) Petro-forming(b) Magnetic pulse forming(c) Explosive forming(d) Electro-hydraulic forming

107. In the 3-2-1 principle of fixture design,3 refers to number of :(a) Setups possible(b) Clamps required(c) Positions on primary face(d) Locating positions

108. The optimum cutting speed is one whichshould have :1. High metal removal rate2. High cutting tool life3. Balance the metal removal rate andcutting tool life.(a) 1,2 and 3(b) 1 and 2 only(e) 2 and 3 onlyCd) 3 only

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109. Stellitc is a non-ferrous cast alloycomposed of :(a) Cobalt, chromium and tungsten(b) Tungsten, vanadium and chromium(c) Molybdenum. tungsten and chromium(d) Tungsten. molybdenum, chromium

and vanadium110. External threads can be produced by :

I. Rolling2. Grinding3. Milling(a) I and 3 only(b) 1and 2 only(e) 2 and 3 only(d) 1,2 and 3


List-/ List-IIA. Top gate 1. Heavy and large

castingsB. Bottom gate 2. Most widely used

and economicalC. Parting gate 3. TurbulenceD. Step gate 4. Unfavourable tem-

perature gradientCode:

A 8 C(a) 3 4 2(b) 1 4 2(c) 3 2 4(d) 2 4

D

3

3

Directions :-Each of the next Nine (9) items consistsof two statements. one labeled as theAssertion (A)' and the other as .Reason(R)'. You are to examine these twostatements carefully and select the answersto these items using the codes given below:Codes:(a) Both A and R are individually true

and R is the correct explanation ofA

(b) Both A and R are individually truebut R is NOT the correct explanationof A

(c) A is true but R is false(d) A is false but R is true

112. Assertion (A) The centrifugal tension ina belt is Tc - mv2.

Reason (R) Since this expression isindependent of the cross-section, it follows that T .'"is independent of the beltsize.

113. Assertion (A) : Hot tears occur duringforging because ofinclusions in the blankmaterial.Bonding between theinclusions and the parentmaterial is throughphysical and chemical

Reason (R)

bonding.

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114. Assertion (A) Lead, Zinc and tin arealways hot worked.

Reason (R)

118. Assertion (A) :"The steel when heatedabove certain

If they are worked in coldstate they cannot retaintheir mechanicalproperties.

temperature and cooledto room temperature.structure adjustmentstabilizes.

Reason (R) The modification ISmainly based on coolingrate.15. Assertion (A) Excess defects arecreated by hammering the

crystalline materials. 119. Assertion (A) The plastic organicmaterials can be easilyReason (R) The thermal fluctuations shaped or moulded by

create the point defects mechanical action.in crystalline materials.Reason (R) It is widely in use as it

can be "permanently116. Assertion (A) Solid solutions of metal moulded.

Reason (R)

are crystals whoseproperties are close tothose of the" solvent.

120. Assertion (A) A composite is amultiphase materialwhich is artificially madeas one that occursnaturally.

They retain the samecrystal lattice and type ofbond.

Reason (R) Technology of modernage requires a materialwith unusualcombination of propertiesthat cannot be met bymetal or alloys.

117. Assertion (A) Carburizing is used formachine elements whichhave to have a wearresistant working surface.

Reason (R) The composition ofsurface layers arechanged in carburizing.

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SPACE FOR ROUGH WORK

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Mech Paper II

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Transcript of Mech Paper II