ISRO Scientist or Engineer Mechanical 2010

Instructions

For the following questions answer them individually

Question 11

Choose the correct figure representing gas to gas heat transfer in parallel flow heat exchanger?

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Question 12

The value of Prandtl number for air is about

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Question 13

4 body cools from $$90^\circ C to 80^\circ C$$ in 5 minutes. Under the same external conditions to cool from $$80^\circ C to 70^\circ C$$ the body will take

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Question 14

When the temperature of a solid surface changes from $$227^\circ C to 1227^\circ C$$ its total emissive power changes from $$E_1 to E_2.$$ The ratio $$\left(\frac {E_2} {E_1}\right)$$ will be

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Question 15

Characteristic gas constant of a gas is equal to

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Question 16

The matrix $$A = \begin{bmatrix}-4 & -3 & -3 \\1 & 0 & 1 \\4 & 4 & x \end{bmatrix}$$ is its own adjoint. The value of x will be

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Question 17

The temperature of sun can be measured using a

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Question 18

A car moving with uniform acceleration covers 450 m in a 5 second interval, and covers 700 m in the next 5 second interval. The acceleration of the car is

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Question 19

A particle starts from rest with a constant acceleration $$\alpha m/sec^2$$ and after some time it decelerates at a uniform rate of $$\beta 8 m/sec^2$$ till it comes to rest. If the total time taken between two rests positions is t, the maximum velocity acquired by the particle would be

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Question 20

Two metallic blocks having masses in the ratio 2: 3 are made to slide down a friction less inclined plane starting initially from rest position. When these blocks reach the bottom of the inclined plane, they will have their kinetic energies in the ratio

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