Q. The critical speed of a shaft with a disc supported in between is equal to the natural frequency of the system in
β
Correct Answer: (A)
transverse vibrations
Dynamics of Machines MCQs | Page - 12
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Q. When there is a reduction in amplitude over every cycle of vibration, then the body is said to have
β
Correct Answer: (C)
damped vibration
Q. In vibration isolation system, if ω/ωn < 2, then for all values of damping factor, the transmissibility will be
β
Correct Answer: (C)
greater than unity
Q. Which of the following is true regarding Ζ>1?
β
Correct Answer: (A)
transmitted force is greater than applied force
Q. Isolation factor is twice the transmissibility ratio.
β
Correct Answer: (B)
false
Q. The height of a Watt’s governor is
β
Correct Answer: (D)
inversely proportional to (speed)
Q. A Watt’s governor can work satisfactorily at speeds from
β
Correct Answer: (A)
60 to 80 r.p.m
Q. The ratio of height of Porter governor to the height of Watt’s governor is
β
Correct Answer: (C)
m + m/m
Q. When the sleeve of a porter governor moves upwards, the governor speed
β
Correct Answer: (A)
increases
Q. When the sleeve of a Porter governor moves downwards, the governor speed
β
Correct Answer: (B)
decreases
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