16. A rod is enclosed centrally in a tube and the assembly is tightened by rigid washers. If the assembly is subjected to a compressive load, then-
A. tube is under tension and rod is under compression
B. The tube is under compression
C. rod is under compression
D. both rod and tube are under compression
17. Which of the following statement is correct?
A. stress is directly proportional to strain within the elastic limit
B. the stress is the pressure per unit area
C. Hook’s law holds good up to the breaking point.
D. the strain is expressed in mm.
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18. The springs in brakes and clutches are used to-
A. to apply forces
B. to store strain energy
C. to measure forces
D. to absorb shocks
19. If the tearing efficiency of a riveted joint is 50%, then the ratio of rivet hole diameter to the pitch of rivets is-
A. 0.20
B. 0.25
C. 0.50
D. 0.65
20. The torque transmitted by a solid shaft of diameter (D) is (let t = Maximum allowable shear stress)-
A. p/4 × t × D³
B. p/16 × t × D³
C. p/32 × t × D³
D. p/64 × t × D³
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