RRB/SSC JE Mech: POWER PLANT Quiz 4

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Question 1

Which of the following statements are correct with respect to regenerative feed heating in a steam cycle?
1) It increases cycle efficiency
2) It increases specific output
3) It reduces the condenser load
4) It improves the steam quality at the end of expansion

• A1 and 3 only
• B2 and 4 only
• C2 and 3 only
• D1, 2, 3 and 4

Question 2

A close cycle gas turbine plant operating on Brayton cycle between 300 K and 1100 K. Some more data pertaining to the cycle are given below:
Pressure ratio of the cycle-= 5
Compressor efficiency-= 0.8
Calorific value of fuel-= 41800 kJ/kg
Combustion loss-= 10% of heating value
-= 1.005 kJ/kgK
-= 1.4
Air-fuel ratio for the plant is

• A64.4
• B70.2
• C68.4
• D80.4

Question 3

Lancashire Boiler is a

• AWater tube boiler
• BFire tube boiler
• CLocomotive boiler
• DHigh pressure boiler

Question 4

In Rankine cycle, the enthalpy of steam entering the turbine is 2800 KJ/Kg. The enthalpy at the end of actual expansion is 2130 KJ /Kg while enthalpy after isentropic expansion is 2000 KJ/Kg. The turbine efficiency is ____ %

• A80.0
• B83.75 
• C75.80
• D90.0

Question 5

The sensing bulb  is located at the

• AExit of the evaporator
• BInlet of the evaporator
• CExit of the condenser
• DInlet of the condenser

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