ISRO Scientist or Engineer Mechanical May 2017


For the following questions answer them individually

Question 21

In which of the following type of gear train, the first gear and last gear are co-axial.

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Question 22

For heat transfer across a composite slab with materials having different thermal conductivity, study the following statements.
I. Temperature is continuous always.
II. Temperature gradient is not continuous.
III. Heat flow is not continuous.

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Question 23

Which of the following treatment does not improve hardness?

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Question 24

The ratio of the height of a porter governor (when the length of arms and links are equal) to the height of watt governor is: (m: mass of the ball; M : mass of the sleeve)

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Question 25

For a specified inlet and outlet temperatures, for which kind of heat exchanger will the log mean temperature difference, $$\triangle T_{lm}$$ will be highest?

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Question 26

Fatigue strength for non-ferrous materials is usually defined at —————— stress cycles.

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Question 27

If $$A = \begin{bmatrix}9 & 6 \\8 & 7 \end{bmatrix}$$ then $$det(A^{99} - A^{98})$$ is

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Question 28

$$\lim_{\theta \rightarrow \frac{\pi}{2}}\frac{\log \left(\theta - \frac{\pi}{2}\right)}{\tan \theta}$$ is

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Question 29

The solution of ODE $$y dx + x dy = 0$$ is

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Question 30

If $$\phi$$ is a scalar point function, the value of curl Grad $$\phi$$ is

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