Dynamics of Machinery (3151911) MCQ

MCQs of Critical speeds of shafts

MCQ No - 1

Critical speed is expressed as ______.

(A)

rotation of the shaft in degrees

(B)

rotation of the shaft in radians

(C)

rotation of the shaft in minutes

(D)

the natural frequency of the shaft


D
MCQ No - 2

The factor which affects the critical speed of a shaft is

(A)

the diameter of the disc

(B)

the span of the shaft

(C)

eccentricity

(D)

all of the mentioned


D
MCQ No - 3

The speed at which the shaft runs so that the additional deflection of the shaft from the axis of rotation becomes ___________ is known as critical or whirling speed.

(A)

zero

(B)

minimum

(C)

maximum

(D)

infinite


D
MCQ No - 4

The critical speed may occur because of __________.

(A)

eccentric mounting of the rotor

(B)

non-uniform distribution of rotor material

(C)

bending of shaft

(D)

all of the mentioned


D
MCQ No - 5

The critical speed of a shaft with a disc supported in between is equal to the natural frequency of the system in

(A)

torsional vibrations

(B)

longitudinal vibrations

(C)

transverse vibrations

(D)

none of the mentioned


C