4051. Spring stiffness is__________________?
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A. its capability of storing energy

B. ratio of coil diameter to wire diameter

C. none of the above

D. its ability to absorb shocks

E. load required to produce unit deflection
4052. If shearing stress in nut is half the tensile stress in a bolt, then nut length should be equal to___________________?
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A. 1.25 x diameter of bolt

B. 1.5 x diameter of bolt

C. diameter of bolt

D. 0.5 x diameter of bolt

E. 0.75 x diameter of bolt

4053. In the case of an elastic bar fixed at upper end and loaded by a falling weight at lower end, the shock load produced can be decreased by_________________?
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A. would depend upon other factors

B. decreasing the cross-section area of bar

C. increasing the cross-section area of bar

D. remain unaffected with cross-section area

E. none of the above

4054. In Vickers hardness testing, the pyramid indentor apex is__________________?
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A. 40

B. 122

C. 152

D. 136

E. 161.

4055. Rankines theory of failure is applicable for following type of materials___________________?
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A. ductile

B. tough

C. brittle

D. plastic

E. elastic

4056. The edges of a boiler plate are bevelled to an angle of______________?
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A. 60

B. 45

C. 85.

D. 30

E. 80
4057. In oilness bearings________________?
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A. grease required to be applied after some intervals

B. do not require external supply of lubricant

C. the oil film pressure is generated only by the rotation of the journal

D. none of the above

E. the oil film is maintained by supplying oil under pressure

4058. Resilience of a material is important, when it is subjected to________________?
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A. combined loading

B. thermal stresses

C. fatigue

D. shock loading

E. wear and tear

4059. For tight leakage joints, following type of thread is best suited ____________________?
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A. square

B. buttress

C. NPT (national pipe threads)

D. metric

E. acme

4060. The usual clearance provided in hydrodynamic bearing per mm of diameter of shaft is___________________?
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A. 1 micron

B. 0.1 micron

C. 10 microns

D. 25 microns

E. 0.01 micron

4061. Yield point in fatigue loading as compared to static loading is__________________?
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A. same

B. depends on other factors

C. lower

D. none of the above

E. higher

4062. The included angle in unified of American National threads is___________________?
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A. 29

B. 47

C. none of the above

D. 60

E. 55

4063. In order to permit the thermal expansion/contraction of tubing, it should be______________?
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A. honed

B. crimped

C. bent

D. none of the above

E. flared

4064. If two springs are in parallel then their overall stiffness will be_______________?
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A. double

B. none of the above

C. unpredictable

D. same

E. half

4065. A hot short metal is_________________?
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A. ductile at high temperature

B. hard when hot

C. brittle when cold

D. brittle when hot

E. brittle under all conditions

4066. A tube has the following advantage over pipe_________________?
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A. none of the above

B. greater shock absorption

C. smoother inside walls

D. all of the above

E. lighter and easier to handle

4067. Aircraft body is usually fabricated by_________________?
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A. casting

B. precasting

C. rivetting

D. unconventional methods

E. welding

4068. Residual stress in materials_________________?
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A. becomes zero when external load is removed

B. acts when external load is applied

C. is independent of external loads

D. is always harmful

E. is always beneficial

4069. Basic shaft is one__________________?
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A. whose lower as well as upper deviations are zero

B. whose lower deviation is zero

C. does not exist

D. whose upper deviation is zero

E. none of the above

4070. A tapered key which fits in a keyway in the hub and is flat on the shaft, is known as___________________?
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A. flat saddle key

B. gib head key

C. hollow saddle key

D. feather key

E. wood-ruff key

4071. The ultimate strength of steel in tension in comparison to shear is in the ratio of__________________?
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A. 1:02

B. 1 : l

C. 2:03

D. 3 : 2

E. 2:01

4072. A bench vice has following type of threads____________________?
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A. BSW

B. metric

C. square

D. buttress

E. acme
4073. Maximum principal stress theory is applicable for_____________________?
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A. elastic materials

B. ductile materials

C. all of the above

D. brittle materials

E. none of the above

4074. Set screws are_________________?
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A. none of the above

B. slotted for a screw driver and generally used with a nut

C. similar to small size tap bolts except that a greater variety of shapes of heads are available

D. used to prevent relative motion be-tween parts

E. similar to stud

4075. If a material fails below its yield point, failure would be due to___________________?
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A. straining

B. sudden loading

C. creep

D. fatigue

E. impact loading

4076. Split nut is a locking device in which_________________?
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A. a slot is cut partly in middle of nut and then slot reduced by tightening screw

B. a hard fiber or nylon cotter is recessed in the nut and becomes threaded as the nut is screwed on the bolt causing a tight grip

C. through slots are made at top and a cotter-pin is passed through these and a hole in the bolt, and cotter pin splitted and bent in reverse direction at the other end

D. one smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming

E. none of the above

4077. For applications involving high stresses in one direction only the following type of thread would be best suited______________________?
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A. ISO metric thread

B. buttress thread

C. square thread

D. acme thread

E. British Association thread

4078. In hydrodynamic bearings_____________________?
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A. do not require external supply of lubricant

B. grease is used for lubrication

C. none of the above

D. the oil film is maintained by supplying oil under pressure

E. the oil film pressure is generated only by the rotation of the journal
4079. Allen bolts are___________________?
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A. self locking bolts

B. provided with hexagonal depression in head

C. designed for shock load

D. used in aircraft application

E. uniform strength bolts

4080. The notch angle of the Izod impact test specimen is________________?
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A. 10

B. 20

C. 60.

D. 45

E. 30

4081. The function of cutting oil when threading a pipe is to___________________?
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A. provide cooling action

B. help remove chips

C. all of the above

D. none of the above

E. lubricate the dies

4082. The function of a washer is to___________________?
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A. provide bearing area

B. provide cushioning effect

C. absorb shocks and vibrations

D. provide smooth surface in place of rough surface

E. act as a locking device

4083. The rated life of a bearing varies___________________?
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A. directly as load

B. inversely as cube of load

C. inversely as fourth power of load

D. none of the above

E. inversely as square of load

4084. The piston rod of a steam engine is usually connected to the cross head by means of__________________?
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A. universal joint

B. cotter joint

C. bolted joint

D. universal coupling

E. kunckle joint

4085. Spring index is___________________?
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A. load required to produce unit deflection

B. ratio of coil diameter to wire diameter

C. nothing

D. indication of quality of spring

E. its capability of storing energy

4086. Which is correct statement ?
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A. a member made of steel will generally be more rigid than a member of equal load-carrying ability made of cast iron

B. a member made of cast iron will generally be. more rigid than a member of equal load carrying ability made of steel

C. both will be equally rigid

D. which one is rigid will depend on several other factors

E. none of the above

4087. If a load W is applied instantaneously on a bar; then the stress induced in bar will___________________?
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A. increase with increase in y

B. depend on other considerations

C. none of the above

D. be independent of ratio of mass of load W to mass of bar (y)

E. decrease with decrease in y

4088. In standard taper roller bearings, the angle of taper of outer raceway is___________________?
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A. 8

B. 5

C. 15

D. 40.

E. 25
4089. In testing a material for endurance strength, it is subjected to_______________________?
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A. static as well as dynamic load

B. static load

C. completely reversed load

D. impact load

E. dynamic load

4090. The maximum stress due to stress concentration in a bar having circular transverse hole, as compared to its static stress without hole will be_________________?
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A. same in both cases

B. 2 times more

C. 3 times more

D. 4 times more

E. unpredictable

4091. The shear plane in case of bolts should_________________?
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A. be across threaded portion of shank

B. never be across the threaded portion

C. none of the above

D. be normal to threaded portion of shank

E. be parallel to axis of bolt

4092. In composite or reverse laid ropes___________________?
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A. none of the above

B. wires in two adjacent strands are twisted in opposite direction

C. direction of twist of wires and strands are same

D. wires are not twisted

E. direction of twist of wires in strands is opposite to the direction of twist of strands

4093. Guests theory of failure is applicable for following type of materials_________________?
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A. tough

B. elastic

C. ductile

D. plastic

E. brittle

4094. When a bolt is subjected to shock loading, the resilience of the bolt should be considered in order to prevent breakage at_______________?
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A. in the middle

B. anywhere in the bolt

C. at the thread

D. shank

E. head

4095. In order to obtain bolt of uniform strength____________________?
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A. increase its length

B. drill an axial hole through head up to threaded portion so that shank area is equal to root area of thread

C. all of the above

D. increase shank diameter

E. tighten die bolt properly

4096. The designation M 33 x 2 of a bolt means___________________?
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A. metric threads of 33 mm outside diameter and 2 mm pitch

B. bolt of 33 mm nominal diameter having 2 threads per cm

C. metric threads with cross-section of 33 mm

D. metric threads of 33 nos in 2 cm.

E. none of the above

4097. Which of the following is a permanent fastening ?
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A. screws

B. cotters

C. keys

D. rivets

E. bolts

4098. If the tearing efficiency of a riveted joint is 75%, then the ratio of diameter of rivet to the pitch is equal to___________________?
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A. 0.75

B. 0.25

C. 0.5

D. 0.2

E. 0.6

4099. Rivets are generally specified by_______________?
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A. all of the above

B. thickness of plates to be riveted

C. length of rivet

D. nominal diameter

E. diameter of head

4100. Jam nut is a locking device in which _____________________?
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A. one smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming

B. a slot is cut partly in middle of nut and then slot reduced by tightening a screw

C. through slots are made at top and a cotter-pin is passed through these and a hole in the bolt, and cotter spitted and bent in reverse direction at other end

D. a hard fiber or nylon cotter is recessed in the nut and becomes threaded as the nut is screwed on the bolt causing a tight grip

E. none of the above