Machine Design
JKSSB Junior Engineer (Mechanical) · Theory of Machines and Machine Design · 46 practice questions with answers and explanations: 8 Easy, 38 Medium, 0 Hard.
Sample questions
Sample Easy question 1
A castle nut with a split pin is used to:
- increase the tensile load
- make assembly faster
- prevent the nut from loosening
- reduce the friction
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Answer: C. The split pin through the slots locks the nut.
Sample Easy question 2
Power transmission shafts are generally made of:
- cast iron
- lead alloy
- aluminium
- mild steel or medium carbon steel
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Answer: D. These steels give good strength and toughness at a reasonable cost.
Sample Easy question 3
Antifriction bearings are also called:
- rolling contact bearings
- sliding bearings
- thrust pads
- journal bearings
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Answer: A. Balls or rollers roll between the races.
Sample Medium question 4
The maximum principal stress theory is most suitable for:
- brittle materials
- ductile materials
- plastics only
- all materials equally
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Answer: A. Rankine's theory predicts failure of brittle materials such as cast iron.
Sample Medium question 5
The maximum shear stress theory is most suitable for:
- brittle materials
- ceramics
- glass
- ductile materials
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Answer: D. Tresca's criterion matches the yielding of ductile metals.
Sample Medium question 6
A shaft transmitting power P (watts) at N revolutions per minute carries a torque of:
- P N / 60
- 2 π N P / 60
- P / (2 π N)
- 60 P / (2 π N)
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Answer: D. P = 2πNT / 60, so T = 60P / (2πN).