Basic Machine Design Multiple choice Questions and Answers pdf

121.    In V-belt drive, belt touches
(a)    at bottom    
(b)     at sides only
(c)    both at bottom and sides
(d)    could touch anywhere
(e)    none of the above.
Ans: b

122.    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
(e)    none of the above.
Ans: a

123.    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
(e)    none of the above.
Ans: a

124.    In standard taper roller bearings, the angle of taper of outer raceway is
(a) 5°
(b) 8°
(c) 15°
(d) 25°
(e) 40°.
Ans: d

125.    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
(e)    none of the above.
Ans: c

126.    Whether any core is required in wireropes
(a) yes
(b) no
(c) sometimes  
(d) rarely
(e) very often.
Ans: a

127.    If 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
(e)    0.5 x diameter of bolt.
Ans: a

128.    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
(e)    none of the above.
Ans: a

129.    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
(e)    none of the above.
Ans: b

130.    I.S. specifies following total number of grades of tolerances
(a) 18
(b) 16
(c) 20
(d) 22
(e) 14.
Ans: a

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