The material used for brake lining should have __________ coefficient of friction.
A. Low
B. High
C. Moderate
D. None of these
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Form coefficient of spring is
A. Ratio of coil diameter to wire diameter
B. Load required to produce unit deflection
C. Its capability of storing energy
D. Concerned with strength of wire of spring
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The piston pin bearings in heavy duty diesel engines are
A. Needle roller bearings
B. Tapered roller bearings
C. Spherical roller bearings
D. Cylindrical roller bearings
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A locking device extensively used in automobile industry is a
A. Jam nut
B. Castle nut
C. Sawn nut
D. Ring nut
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The design calculations for members subject to fluctuating loads with the same factor of safety, yield the most conservative estimates when using
A. Gerber relation
B. Soderberg relation
C. Goodman relation
D. None of these
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Creep in belt is due to
A. Material of the belt
B. Material of the pulley
C. Uneven extensions and contractions due to varying tension
D. All of the above
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The spring mostly used in gramophones is
A. Helical spring
B. Conical spring
C. Flat spiral spring
D. Volute spring
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In designing a connecting rod, it is considered like __________ for buckling about X-axis.
A. Both ends hinged
B. Both ends fixed
C. One end fixed and the other end hinged
D. One end fixed and the other end free
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In designing a connecting rod, it is considered like __________ for buckling about Y-axis.
A. Both ends hinged
B. Both ends fixed
C. One end fixed and the other end hinged
D. One end fixed and the other end free
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Tensile strength of a mild steel specimen can be roughly predicted from following hardness test
A. Brinell
B. Rockwell
C. Vickers
D. None of the above
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Which of the following statement is correct regarding power screws?
A. The efficiency of a self locking screw can not be more than 50%
B. The efficiency of Acme (trapezoidal) thread is less than that of a square thread
C. If the friction angle is less than the helix angle of the screw, then the efficiency will be more than 50%
D. Both (A) and (B)
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A locking device extensively used in marine type connecting rod ends is a
A. Jam nut
B. Castle nut
C. Sawn nut
D. Ring nut
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A connecting rod should be
A. Strong in buckling about X-axis
B. Strong in buckling about Y-axis
C. Equally strong in buckling about X-axis and Y-axis
D. Any one of the above
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A screw is said to be over hauling screw, if the
A. Friction angle is less than helix angle
B. Friction angle is more than helix angle
C. Friction angle is equal to helix angle
D. Efficiency of screw is 100%
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When a nut is tightened by placing a washer below it, the bolt will be subjected to following type of loads
A. Compression
B. Tension
C. Shear
D. Combined loads
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In order to permit the thermal expansion/contraction of tubing, it should be
A. Crimped
B. Honed
C. Flared
D. Bent
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The rolling contact bearings are known as
A. Thick lubricated bearings
B. Plastic bearings
C. Antifriction bearings
D. Thin lubricated bearings
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Deep groove ball bearings are used for
A. Heavy thrust load only
B. Small angular displacement of shafts
C. Radial load at high speed
D. Combined thrust and radial loads at high speed
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A compound cylinder with inner radius 50 mm and outer radius 70 mm is made by shrinking one cylinder on to the other cylinder, the junction radius is 60 mm and the junction pressure is 1.1 N/mm2 . The maximum hoop stress developed in the inner cylinder is
A. 3.6 N/mm2 compression
B. 3.6 N/mm2 tension
C. 7.2 N/mm2 compression
D. 7.2 N/mm2 tension
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A backing ring is used inside the pipe joint when making a
A. Butt weld
B. Fillet weld
C. Sleeve weld
D. Socket weld
Select an option to see the answer and solution.