GATE (Graduate Aptitude Test in Engineering) Mechanical Engineering: Questions 79 - 82 of 170

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Question 79

Appeared in Year: 2015

Question

Numeric Answer▾

A Carnot engine (CE-1) works between two temperature reservoirs A and B, where and . A second Carnot engine (CE-2) works between temperature reservoirs B and C, where . In each cycle of CE-1 and CE-2, all the heat rejected by CE-1 to reservoir B is used by

CE-2. For one cycle of operation, if the net Q absorbed by CE-1 from reservoir A is , the net heat rejected to reservoir C by CE-2 (in MJ) is

Question 80

Basic Concept of Cad and Cam and Their Integration Tools

Appeared in Year: 2015

Question

MCQ▾

The function of interpolator in a CNC machine controller is to

Choices

Choice (4)Response

a.

coordinate feed rates of axes

b.

perform Miscellaneous (M) functions (tool change, coolant control etc.)

c.

control tool rapid approach speed

d.

control spindle speed

Question 81

Appeared in Year: 2015

Question

MCQ▾

For flow through a pipe of radius R, the velocity and temperature distribution are as follows:

, and where and are constants. The bulk mean temperature is given by , with being the mean velocity of flow. The value of is ________

Choices

Choice (4)Response

a.

b.

c.

d.

Question 82

Free and Forced Vibrations of Single Degree of Freedom Systems

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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