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ESE ME: Theory of Machines & Vibrations Champion Quiz 5

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Question 1

The speed rating for turbine rotors is invariably more than

times its natural frequency to

Question 2

Critical speed is expressed as

Question 3

The static deflection of a shaft under a flywheel is 4 mm. Taking g=10 m/s²,What is the critical speed in rad/s?

Question 4

Which one of the following causes whirling of shafts?

Question 5

Match List-I (property) with List-II (System) and select the correct answer using the code given below the lists:
List-I
A) Resonance
B) On-off control
C) Natural frequency
D) Feedback signal
List-II
1) Closed-loop control system
2) Free vibrations
3) Excessively large amplitude
4) Mechanical brake

Question 6

Figure shows a single degree of freedom system. The system consists of a massless rigid bar OP hinged at 0 and a mass m at end P. The natural frequency of vibration of the system is

Question 7

A single degree of freedom system has a mass of 2 kg, stiffness 8 N/m and viscous damping ratio 0.02. The dynamic magnification factor at an excitation frequency of 1.5 rad/s is ________

Question 8

The sleeve and each rotating mass of a porter governor weigh respectively, 200 N 50 N. If the friction at the sleeve is 10 N then the coefficient of detention would be _________.

Question 9

In a slider-bar mechanism, when does the connecting rod have zero angular velocity?

Question 10

In circular arc cam with a flat faced reciprocating follower, the contact between the follower and the nose of cam is only maintained if:

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ESE & GATE ME Theory of Machines & Vibrations

Jun 11ESE & GATE ME