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Free download in PDF Machine Design Multiple Choice Questions(MCQs) with Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
61
Which of the following is an antifriction bearing?
[A]
journal bearing
[B]
pedestal bearing
[C]
collar bearing
[D]
needle bearing
62
The metal suitable for bearings subjected to light loads is
[A]
silicon bronze
[B]
white metal
[C]
monel metal
[D]
phosphor bronze
63
Which of the following statement is correct ?
[A]
The toughness of a material increases when it is heated.
[B]
The shear stress in a beam varies from zero at the neutral surface and maximum at the outer fibres.
[C]
The stress concentration in static loading is more serious in brittle materials and less serious in ductile materials.
[D]
The stress concentration in static loading is more serious in ductile materials and less serious in brittle materials.
Answer: The stress concentration in static loading is more serious in brittle materials and less serious in ductile materials.
64
In a gear, having involute teeth, the normal to the involute is a tangent to the
[A]
pitch circle
[B]
base circle
[C]
addendum circle
[D]
dedendum circle
65
The radial distance of a tooth from the pitch circle to the top of the tooth is called
[A]
dedendum
[B]
addendum
[C]
clearance
[D]
working depth
66
The shock absorbing capacity of a bolt can be increased by
[A]
tightening it properly
[B]
increasing shank diameter
[C]
using washer
[D]
making shank diameter equal to core diameter of thread.
Answer: making shank diameter equal to core diameter of thread.
67
When a bolt is subjected to shock loading, the resilience of the bolt should be considered in order to prevent breakage at
[A]
shank
[B]
head
[C]
in the middle
[D]
at the thread
68
If an application calls for stresses on screw threads in one direction only, then the following type of thread would be best suited
[A]
square
[B]
acme
[C]
buttress
[D]
BSW
69
The connecting rod bolts are tightened up with initial tension greater than the external load so that
[A]
joint may not open up
[B]
bolts are weakest elements
[C]
the resultant load on the bolt would not be affected by the external cyclic load
[D]
bolts will not loosen during service
Answer: the resultant load on the bolt would not be affected by the external cyclic load
70
The connecting rod bolts are tightened up so that tightening stress
[A]
is just sufficient to hold parts together
[B]
approaches yield point
[C]
is 50% of yield point
[D]
is about yield point divided by safety factor
Answer: approaches yield point
71
Allen bolts are
[A]
self locking bolts
[B]
designed for shock load
[C]
used in aircraft application
[D]
provided with hexagonal depression in head
Answer: provided with hexagonal depression in head
72
For standard coarse threads of nut, the threads will be as strong in failure by shear as the bolt in tension, if the height of nut (h) is approximately
[A]
0.4 times
[B]
0.6 times
[C]
0.7 times
[D]
0.8 times
73
Basic hole is one
[A]
whose upper deviation is zero
[B]
whose lower deviation is zero
[C]
whose lower as well as upper deviations are zero
[D]
does not exist
Answer: whose lower deviation is zero
74
Basic shaft is one
[A]
whose upper deviation is zero
[B]
whose lower deviation is zero
[C]
whose lower as well as upper deviations are zero
[D]
does not exist
Answer: whose upper deviation is zero
75
shearing stress in nut is half the tensile stress in a bolt, then nut length should be equal to
[A]
diameter of bolt
[B]
0.75 x diameter of bolt
[C]
1.25 x diameter of bolt
[D]
1.5 x diameter of bolt
76
In composite or reverse laid ropes
[A]
direction of twist of wires in strands is opposite to the direction of twist of strands
[B]
direction of twist of wires and strands are same
[C]
wires in two adjacent strands are twisted in opposite direction
[D]
wires are not twisted
Answer: wires in two adjacent strands are twisted in opposite direction
77
In cross or regular lay ropes
[A]
direction of twist of wires in strands is opposite to the direction of twist of strands
[B]
direction of twist of wires and strands are same
[C]
wires in two adjacent strands are twisted in opposite direction
[D]
wires are not twisted
Answer: direction of twist of wires in strands is opposite to the direction of twist of strands
78
Three different weights fall from a certain height under vacuum. They will take
[A]
same time to reach earth
[B]
times proportional to weight to reach earth
[C]
times inversely proportional to weight to reach earth
[D]
unpredictable
Answer: same time to reach earth
79
In V-belt drive, belt touches
[A]
at bottom
[B]
at sides only
[C]
both at bottom and sides
[D]
could touch anywhere
80
In oilness bearings
[A]
the oil film pressure is generated only by the rotation of the journal
[B]
the oil film is maintained by supplying oil under pressure
[C]
do not require external supply of lubricant
[D]
grease required to be applied after some intervals
Answer: do not require external supply of lubricant
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