ISRO Scientist or Engineer Mechanical 2020

Instructions

For the following questions answer them individually

Question 71

Which of the following hardness tester uses Diamondconetype indenter?

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Question 72

In a two component system, if the non-compositional variable is only temperature, the number of degrees of freedom in the case of a single phase field as per Gibbs Phase Rule is?

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Question 73

In an iron—carbon diagram, the percentage by weight of carbon at eutectoid composition is

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Question 74

Of the various microstructures that may be produced for a given steel alloy, which among the following is the hardest form

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Question 75

Which apringsteel is widely used for aircraft engine valves

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Question 76

If $$K_{f}$$ is the fatigue stress concentration factor and $$K_{t}$$ is the theoretical stress concentration factor then, the notch sensitivity q is?

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Question 77

Beach or clamshell markson a failed metallic surface are typical of

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Question 78

In vibration isolation if $$\frac{\omega}{\omega_{n}}$$ is less than $$\sqrt{2}$$ then transmissibilty will be

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Question 79

The natural frequency of a simply supported beam of length l with mass M at its centre , flexual rigidity EI and negligable beam mass is

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Question 80

A machine component of natural frequency 200 $$\frac{rad}{s}$$ is Subjected to a base motion from the machine which is harmonic in nature with amplitude 3 $$\frac{m}{s^{3}}$$ at $$\frac{rad}{sec}$$ Whatis the peak amplitude of relative displacement of the components if the damping is negligable

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