ISRO Scientist or Engineer Mechanical 2007

Instructions

For the following questions answer them individually

Question 121

Circumferential and longitudinal strains in the cylindrical boiler under internal steam pressure are $$ε_1$$ and $$ε_2$$ respectively. Change in the volume of the boiler cylinder per unit volume will be

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Question 122

lf water in closed pipe freezes, the pipe will

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Question 123

The notch angle of Izod impact test specimenis

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Question 124

Which of the following statements regarding laws governing the friction between dry surfacesare correct?
1. The friction force is dependenton the velocity sliding.
2. The friction force is directly proportional to the normal force.
3. The friction force is dependent on the materials of the contact surfaces.
4. The friction force is independent of the area of contact.
Select the correct answer using the codes given below:

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Question 125

A simple spring-massvibrating system has a natural frequencyof N. If the spring stiffness is halved and the massis doubled, then the natural frequency will become

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Question 126

Under logarithmic decrement, the amplitude of successive vibrations are

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Question 127

Periodic time of simple pendulum is given by

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Question 128

In a single reduction,a large velocity ratio is required. The best transmission is

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Question 129

Idler pulley is used

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Question 130

If two bodies one light and other heavy have equal kinetic energies, which onehas a greater momentum

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