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SSC JE 2019-20: Technical Quiz 2

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Question 1

Heat Rejection Factor (H.R.F) is given by

(where the COP is that of a refrigerator)

Question 2

A gas contained in a cylinder is compressed the work required for compression being 6000kJ. During the process heat interaction of 3000kJ causing the surrounding to be heated. The change in internal energy of the gas during the process is

Question 3

The enthalphy drop for flow through convergent horizontal nozzles is 100 kJ/kg. If the velocity of approach at inlet to the nozzle is negligible, the exit velocity of the fluid is

Question 4

For steady flow through an insulated horizontal constant diameter pipe, this property remains constant

Question 5

A seamless pipe of diameter d m is to carry fluid under a pressure of p kN/cm2. The necessary thickness t of metal in cm, if the maximum stress is not to exceed σ kN/cm2 is

Question 6

Which of the following elements given below determine(s) the maximum attainable, hardness in steel?
[1]. Chromium
[2]. Manganese

[3]. Carbon
[4]. Molybdenum

Select the correct answer using the code given below?

Question 7

A flat plate of 4m length is kept parallel to air flowing at 5 m/s at 15 ºC. Assuming the density of air to be 1.2 kg/m3 and dynamic viscosity to be 1.76 × 10–5 kg/m-s, and knowing that the flow becomes turbulent when Reynolds number exceeds 5 × 105, the flow will become turbulent at

Question 8

Thickness of a steel plate is reduced from 20mm to 10mm by passing it through rolls of diameter 300mm in a multipass rolling operation. If the coefficient of friction is 0.1, then calculate the minimum number of passes required.

Question 9

A composite wall of a furnace has 2 layers of equal thickness have thermal conductivities in the ratio of 3 : 2. What is the ratio of the temperature drop across the two layers?

Question 10

Following data is obtained from a Rankine power plant:

Enthalpy at turbine inlet = 2765kJ/kg

Enthalpy after expansion = 1560kJ/kg

Heat addition = 2700kJ/kg

Pump work = 20KJ/kg

Generator efficiency = 95%

Calculate the overall plant efficiency (%) for the above data.

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