Applied Mechanics and Design-Vibrations [GATE (Graduate Aptitude Test in Engineering) Mechanical Engineering (ME)]: Questions 1 - 4 of 55

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Question 1

Question MCQ▾

In a forced vibration with viscous damping, maximum amplitude occurs when forced frequency is

Choices

Choice (4)Response

a.

Equal to natural frequency

b.

Slightly greater than natural frequency

c.

Slightly less than natural frequency

d.

Zero

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Question 2

Question MCQ▾

The value of the natural frequency obtained by Rayleigh՚s method

Choices

Choice (4)Response

a.

Is independent of the initial deflection curve chosen

b.

Is always greater than the actual fundamental frequency

c.

Is always less than the actual fundamental frequency

d.

Depends upon the initial deflection curve chose and may be greater than or less than the actual fundamental frequency

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Question 3

Question MCQ▾

Which one of the following causes the whirling of shafts?

Choices

Choice (4)Response

a.

Fluctuation of speed

b.

Misalignment of bearings

c.

Internal damping

d.

Non-homogeneity of shaft material

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Question 4

Appeared in Year: 2015

Question MCQ▾

A mobile phone has a small motor with an eccentric mass used for vibrator mode. The location of the eccentric mass on motor with respect to center of gravity (CG) of the mobile and the rest of the dimensions of the mobile phone are shown. The mobile is kept on a flat horizontal surface.

Flat Horizontal

Given in addition that the , , , . Uniform speed of the motor in RPM for which the mobile will get just lifted off the ground at the end Q is approximately

Choices

Choice (4)Response

a.

4000

b.

3000

c.

3500

d.

4500

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