RRB JE-Mechanical Engineering Solved Paper-8

Test Preparation on RRB JE-Mechanical Engineering Solved Paper-8

1.

Pick up the wrong statement. A refrigerant should have

1Tow specific heat of liquid
2high boiling point
3high latent heat of vaporization
4higher critical temperature
5low specific volume of vapour.

2.

A standard ice point temperature corresponds to the temperature of

1water at 0
2ice at - 4
3solid and dry ice
4mixture of ice, water and vapour under equilibrium conditions under NTP conditions
5mixture of ice and water Under equilibrium conditions.

3.

Vapor compression refrigeration is somewhat like

1Carnot cycle
2Rankine cycle
3reversed Camot cycle
4reversed Rankine cycle
5none of the above.

4.

Which of the following cycles uses air as the refrigerant

1Ericsson
2Stirling
3Carnot
4Bell coleman
5none of the above.

5.

Ammonia-absorption refrigeration cycle requires

1very little work input
2maximum work input
3nearly same work input as for vapour compression cycle
4zero work input
5none of the above.

6.

An important characteristic of absorption system of refrigeration is

1noisy operation
2quiet operation
3cooling below 0
4very little power consumption
5its input only in the form of heating.

7.

The relative coefficient of performance is

1actual COP/theoretical COP
2theoretical COP/actual COP
3actual COP x theoretical COP
41-actual COP x theoretical COP
51-actual COP/theoretical COP.

8.

Clapeyron equation is a relation between

1temperature, pressure and enthalpy
2specific volume and enthalpy
3temperature and enthalpy
4temperature, pressure, and specific volume
5temperature, pressure, specific value and enthalpy.

9.

Clapeyron equation is applicable for registration at

1saturation point of vapour
2saturation point of liquid
3sublimation temperature
4triple point
5critical point.

10.

In vapour compression cycle, the condition of refrigerant is saturated liquid

1after passing through the condenser
2before passing through the condenser
3after passing through the expansion throttle valve
4before entering the expansion valve
5before entering the compressor.

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