SSC JE Mechanical Engineering 2nd March 2017 Shift-1

Instructions

For the following questions answer them individually

Question 11

A reversible thermodynamic cycle containing only three processes and producing work is to be constructed. The constraints are
A. there must be one isothermal process
B. there must be one isentropic process
C. maximum and minimum cycle pressures and the clearance volume are fixed, and
D. polytropic processes are not followed Then, the number of possible cycles is

Question 12

Which combination of the following statements is correct?
The incorporation of re-heater in a steam power plant
A: Always increases the thermal efficiency of the plant
B: Always increases the dryness fraction of steam at condenser inlet
C: Always increases the main temperature of heat addition
D: Always increases the specific work output

Question 13

The amount of heat required to raise the temperature of 1 kg of water from $$0^\circĀ  C$$ to the saturation temperature $$Ts ^\circĀ  C$$ at a given constant pressure is defined as _____.


Question 14

The enthalpy of steam is defined as ___

Question 15

What are the advantages of water tube boilers over fire tube boilers?
A. Steam at higher pressures can be produced.
B. More effective heat transfer.
C. Sediment deposition is more.

Question 16

What is the state, in which none of the properties of the system change with time, known as?


Question 17

The rate of heat transfer across any plane normal to the x-direction is proportional to the wall area and the temperature gradient in the x-direction. This statement is also referred to as _____

Question 18

The critical temperature of a pure substance is defined as _____

Question 19

Which of the following is the correct expression for the maximum thermal efficiency $$(\eta)$$ of a system undergoing a reversible power cycle while operating between thermal reservoirs at temperatures $$T_{c}$$ and $$T_{h}$$


Question 20

In actual refrigeration systems, the compressor handles vapour only. What is this process commonly referred to as _____

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