Thermal power plant mcq

1. In steam power plant which of the following component needs more maintenance:

a) Condenser
b) Boiler
c) Turbine
d) Coal carrying system

B

2. The pH value of the water used in boiler is:

a) unity
b) 7
c)slightly less than seven
d) slightly more than seven

D

3. For the flue gas flow, tick the correct sequence:

a) Boiler-Air preheater- economizer- ID fan- Chimney
b) Boiler- ID fan -Air preheater- Economizer- Chimney
c) Boiler- Economizer- Air preheater- ID fan- Chimney
d) None of the above

C

4. Hydrogen cooling employed in large thermal power plant alternator:

a) Increases the insulation life
b) Decreases the insulation life
c) Does not effect the insulation life
d) None of the above

A

5. Hydrogen cooling is employed in:

a) Turbo Generators only
b) Water wheel Generators only
c) Can b used in both turbo generators and water wheel generators
d) none of the above

A

6. The efficiency of the electro static precipitators will be of the order:

a) 99.6%
b) 90%
c) 85%
d) 80%

A

7. Economizer is normally employed when boiler pressure exceeds:

a) 70 kg/cm²
b) 50 kg/cm²
c) 30 kg/cm²
d) can be used for all pressures

A

8. The sizing of the generator in power plant is based on:

a) Current carrying capacity ratings only
b Insulation strength ratings only
c) Both (a) and (b)
d) None of the above

C

9. With out Electro static precipitators:

a) ID fan rating should be increased
b) Economizer rating should be increased
c) Chimney height should be reduced
d) None of the above

A

10. In thermal power plants the condenser used is of:

a) surface type
b) jet type
c) can be both surface type and jet type
d) none of the above

A