 Engineering Machine - Engineering Machine objective questions and answers

26. In case of simple pendulam, the period of one oscillation is given by.......

A.π √ l / 2g

B.π √ 2l / g

C.2 π √ l / g

D.2 π √ l / 2g

C.2 π √ l / g

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27. In case of S.H.M. the period of oscillation is given by.......

A.T = 2 ω / π 2

B.T = 2 π / ω

C.T = ω / 2 π

D.T = π / 2 ω

B. 2 π / ω

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28. The maximum efficiency of a screw jack with square threads and friction angle of 30 0 can be.........

A.100 %

B.50 %

C.33 %

D.30 %

E.11 %

C. 33 %

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29. A machine is said to be irreversible if its efficiency is......

A.100 %

B.0 %

C.50 %

D.More than 50 %

E.Less than 50 %

E. Less than 50 %

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30. The range of projectile is maximum when the angle of projection is.......

A.45 0

B.30 0

C.60 0

D.22 1/2 02 times

A. 45 0