61
A bolt is designed on the basis of __________ with a large factor of safety.
A)
Direct tensile stress
B)
Direct compressive stress
C)
Direct bending stress
D)
Direct shear stress
Answer & Solution
Answer: Option
A
62
The longitudinal stress is __________ of the circumferential stress.
A)
One-half
B)
Two-third
C)
Three-fourth
D)
Double
Answer & Solution
Answer: Option
A
63
The constant factor in case of R10 series of preferred numbers is
A)
1.06
B)
1.12
C)
1.26
D)
1.58
Answer & Solution
Answer: Option
C
64
The distribution of the forces along the length of key fitted in a shaft
A)
Varies linearly
B)
Is uniform throughout
C)
Varies exponentially, being more near the torque-input end
D)
Varies exponentially, being less near the torque-input end
Answer & Solution
Answer: Option
C
65
The ratio of driving tensions in V-belt drives is __________ flat belt drives.
A)
Equal to
B)
sin$$\,\alpha $$ times more than
C)
sin$$\,\alpha $$ times less than
D)
cosec$$\,\alpha $$ times more than
Answer & Solution
Answer: Option
D
66
Which of the following is an anti-friction bearing?
A)
Journal bearing
B)
Pedestal bearing
C)
Collar bearing
D)
Needle bearing
Answer & Solution
Answer: Option
D
67
The anti-friction bearings
A)
Have low starting and low running friction at moderate speeds
B)
Have high initial cost
C)
Can carry both radial and thrust loads
D)
All of these
Answer & Solution
Answer: Option
D
68
Elastic nut is a locking device in which
A)
One small 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)
Hard fibre or nylon cotter is recessed in the nut and becomes threaded as the nut is stewed on the bolt causing a tight grip
D)
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 other end
Answer & Solution
Answer: Option
C
69
Jam nut is a locking device in which
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)
A hard fibre or nylon cotter is recessed in the nut and becomes threaded as the nut is screwed on the bolt causing a tight grip
D)
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
Answer & Solution
Answer: Option
A
70
Split nut is a locking device in which
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 screw
C)
A hard fibre or nylon cotter is recessed in the nut and becomes threaded as the nut is screwed on the bolt causing a tight grip
D)
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
Answer & Solution
Answer: Option
B
