ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2015

Instructions

For the following questions answer them individually

Question 41

Electron beam machining processis suitable for the following type of material

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Question 42

The length of a second’s pendulum is

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Question 43

The period of oscillation of a simple pendulum depends on

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Question 44

A spherical vessel with an inside diameter of 2 m is made of material having an allowable stress in tension of 500 kg/cm$$^2$$. The thickness of a shell to withstand a pressure of 50 kg/cm$$^2$$ should be

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Question 45

For best hydraulic rectangular cross-section of an open channel, its depth should be equal to

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Question 46

Compare the strengths of solid and hollow shafts both having outside diameter D and hollow shaft having inside diameter of $$\frac{D}{2}$$ in torsion. The ratio of strength of solid to hollow shafts in torsion will be

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Question 47

Following gases are used in Tungsten inert gas welding

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Question 48

A heat engine is supplied heat at the rate of 30,000 J/s and gives an output of 9 kW. The thermal efficiency of engine will be

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Question 49

If a body is transmitting torque T kgm at angular speed of $$\theta$$ radians/sec, then h.p. transmitted will be

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Question 50

The critical radius of insulation for a spherical shell is

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