Power Plant Engineering Multiple Choice Questions on “Steam Power Plant Appraisal”.
1. The thermal efficiency of a Watt’s Beam Engine is about?
a) 50%
b) 100%
c) 5%
d) 2%
Answer: d
Clarification: From the performance table consisting of performance data of various steam power plants(Aschner), the efficiency of Watt’s Beam Engine is about 2%.
2. The thermal efficiency of a 1 MW locomotive steam engine is about?
a) 2%
b) 3%
c) 6%
d) 7%
Answer: d
Clarification: From the performance table consisting of performance data of various steam power plants(Aschner), the efficiency of 1 MW locomotive steam engine is about 7%.
3. The number of feedwater heaters required in a Watt’s Beam Engine is?
a) 0
b) 4
c) 6
d) 8
Answer: a
Clarification: A Watt’s Beam Engine does not employ any feedwater heaters & hence the number of feedwater heaters in a Watt’s Beam Engine is ZERO.
4. Among 1 MW, 2 MW, 30 MW & 660 MW locomotive steam engines, the highest efficiency is?
a) 1 MW
b) 2 MW
c) 30 MW
d) 660 MW
Answer: d
Clarification: From the performance table consisting of performance data of various steam power plants(Aschner), the efficiency of 1 MW locomotive steam engine is about 7%, 2 MW locomotive steam engine is about 20%, 30 MW locomotive steam engine is about 35%, 660 MW locomotive steam engine is about 44%.
5. The initial pressure of a Watt’s Beam Engine is about?
a) 1 bar
b) 2 bar
c) 3 bar
d) 4 bar
Answer: b
Clarification: From the performance table consisting of performance data of various steam power plants(Aschner), the pressure of a Watt’s Beam Engine is about 2 bar.
6. What is the exhaust condition of a Watt’s Beam Engine?
a) near saturation
b) dry
c) wet
d) 0.9 dry
Answer: c
Clarification: From the performance table consisting of performance data of various steam power plants(Aschner), the exhaust condition of a Watt’s Beam Engine is wet.
7. The number of feedwater heaters required for a 660 MW locomotive steam engine is?
a) 4
b) 0
c) 7
d) 8
Answer: c
Clarification: From the performance table consisting of performance data of various steam power plants(Aschner), the number of feedwater heaters required by a 660 MW locomotive steam engine are 7.
8. Among 1 MW, 2 MW, 30 MW & 660 MW locomotive steam engines, the highest initial pressure is?
a) 1 MW
b) 2 MW
c) 30 MW
d) 660 MW
Answer: d
Clarification: From the performance table consisting of performance data of various steam power plants(Aschner), the initial pressure of 1 MW locomotive steam engine is about 15 bar, 2 MW locomotive steam engine is about 15 bar, 30 MW locomotive steam engine is about 40 bar, 660 MW locomotive steam engine is about 160 bar.
9. Among 1 MW, 2 MW, 30 MW & 660 MW locomotive steam engines, the highest initial temperature is?
a) 1 MW
b) 2 MW
c) 30 MW
d) 660 MW
Answer: d
Clarification: From the performance table consisting of performance data of various steam power plants (Aschner), the initial temperature of 1 MW locomotive steam engine is about 300 degree Celsius bar, 2 MW locomotive steam engine is about 250 degree Celsius, 30 MW locomotive steam engine is about 450 degree Celsius, 660 MW locomotive steam engine is about 540 degree Celsius.
10. Common size unit of a Steam Power Plant is?
a) 30 MW(e)
b) 300 MW(e)
c) 500 MW(e)
d) 150 MW(e)
Answer: c
Clarification: The most common size steam power plant is of 500 MW(e). Further large size plants have been built, but aren’t found in common usage.