Dynamics of Machinery (2161901) MCQ

MCQs of Dynamics of Reciprocating Engines

MCQ No - 1

When the crank is at the inner dead centre, in a reciprocating steam engine, then the velocity of the piston will be

(A) minimum
(B) zero
(C) maximum
(D) none of these

B
MCQ No - 2

The unbalanced primary forces in a reciprocating engine are

(A) balanced partially
(B) balanced completely
(C) balanced by secondary forces
(D) not balanced

A
MCQ No - 3

If the mass of the reciprocating parts is doubled, then the primary force is halved.

(A) True
(B) False

B
MCQ No - 4

In order to balance the reciprocating masses,

(A) primary forces and couples must be balanced
(B) secondary forces and couples must be balanced
(C) both (a) and (b)
(D) none of these

C
MCQ No - 5

The acceleration of piston in a reciprocating steam engine is given by (where ω = Angular velocity of a crank, r = Radius of crankpin circle, θ = Angle turned by a crank from inner dead centre, and n = Ratio of length of connecting rod to the radius of a crank)

(A) r.ω sin θ+sin 2θn
(B) r.ω cos θ+cos 2θn
(C) r.ω2 sin θ+sin 2θn
(D) r.ω2 cos θ+cos 2θn

D