ISRO Scientist or Engineer Mechanical 2020

Instructions

For the following questions answer them individually

Question 41

If a block slides outward on a link at a uniform rate of 30 $$\frac{m}{s}$$, while the link is rotating at a constant angular velocity of 50 $$\frac{rad}{s}$$ counter clockwise, the Coriolis component of acceleration is ................$$ \frac{m}{sec^{2}}$$.

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Question 42

In a screw jack of lead angle a, the effort required to lift the load Wis given by ........... ($$\phi$$ = Friction Angle)

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Question 43

When the axes of first and last gear are co-axial, then gear train is known as

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Question 44

A disc spinning on its axis at 20 $$\frac{rad}{s}$$ will undergo precession when a torque 100 N-m is applied about an axis normal to it. If the mass momentof inertia is 1 kg-m?, then the angularvelocity of precession is?

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Question 45

Which of the following is an absorption type dynamometer?

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Question 46

Which of the following mechanism provides intermittent rotary motion

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Question 47

If m, nare integers and m + n is odd then the value of $$ \int_{0}^{\pi} \sin mx . \cos nx dx $$is

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Question 48

$$1+x+\frac{x^{2}}{2}-\frac{x^{4}}{8}-\frac{x^{5}}{15}+................\infty$$

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Question 49

The Laplace transform of $$e^{at} \cos \omega t$$

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Question 50

If $$\nu = yzi + 3zxj + zk$$, then curl $$\nu$$ is

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