Power Plant Engineering Practice Test 1

1. The cycle efficiency ________________ with the _____________ of condenser pressure.

does not vary, decrease

decreases, decrease

remains same, decrease

increases, decrease

2. What is the effect of the increase in the superheat at constant pressure?

Decreases mean temperature of heat addition

Decreases cycle efficiency

Increases mean temperature of heat addition

None of the mentioned

3. Which of the following statement is true?

efficiency is exponential function of mean temperature of heat addition

efficiency is directly proportional to mean temperature of heat addition

efficiency is inversely proportional to mean temperature of heat addition

efficiency does not depend on mean temperature of heat addition

4. Most of the turbine expansion takes place in ____________

Plastic Region

Vapour Region

Solid Region

Liquid Region

5. What is the actual turbine inlet temperature in Rankine cycle?

1150C

800C

550C

700C

6. Which of these factors don't cause Internal Irreversibility of a Rankine cycle?

Fluid Friction

Throttling

Mixing

Fluid flow

7. The cycle efficiency in a single reheat plant is influenced by _____________

pressure at tubine inlet

pressure at which steam is reheated

temperature at tubine inlet

temperature at which steam is reheated

8. Rankine cycle comprises of ___________

two isentropic processes and two constant pressure processes

two isentropic processes and two constant volume processes

none of the mentioned

two isothermal processes and two constant pressure processes

9. For a given value of mean temperature of heat addition(Tm) is?

efficiency of Rankine is more if turbine exit temperature(Tmin) is less

none of the mentioned

efficiency of Rankine is less if turbine exit temperature(Tmin) is less

efficiency does not depend on turbine exit temperature

10. What are the components of a Steam Power Plant?

Evaporator, Condenser, Boiler, Expansion valve

Boiler, Turbine, Pump, Expansion valve

Evaporator, Condenser, Boiler, Turbine

Boiler, Turbine, Condenser, Pump