Power Plant Engineering Multiple Choice Questions on “Superheaters, Reheaters and Steam Generator Control”.
1. Which of the following is a water tube boiler?
a) Lancashire boiler
b) Cochran boiler
c) Babcock & Wilcox boiler
d) Locomotive boiler
Answer: c
Clarification: The Cochran Boiler is a type of water tube boiler.
2. The number of fire tubes in a Cochran boiler are ___________
a) 75
b) 165
c) 225
d) 175
Answer: b
Clarification: The number of fire tubes in a Cochran boiler is 165.
3. The chimney draught varies with?
a) climatic conditions
b) temperature of furnace gases
c) height of chimney
d) all of the mentioned
Answer: d
Clarification: The chimney draught varies with climatic conditions, temperature of furnace gases, height of chimney, etc.
4. The diagram factor is the ratio of ___________
a) area of actual indicator diagram to the area of theoretical indicator diagram
b) actual work done per stroke to the theoretical work done per stroke
c) actual mean effective pressure to the theoretical mean effective pressure
d) any of the above mentioned
Answer: d
Clarification: The ratio of any of the mentioned factors is called the Diagram factor.
5. The diameter of a cylindrical shell of a Scotch marine boiler varies from ___________
a) 3.5 to 4.5m
b) 1.5 to 2m
c) 2.5 to 3.5m
d) none of the mentioned
Answer: c
Clarification: The diameter of a cylindrical shell of a Scotch marine boiler varies from 2.5 to 3.5m.
6. A closed vessel made of steel & used for the generation of steam is called a ___________
a) steam condenser
b) steam boiler
c) steam injector
d) steam turbine
Answer: b
Clarification: A closed vessel made of steel & used for the generation of steam is called a steam boiler.
7. Lancashire boiler has _____ internal flue tubes.
a) 1
b) 3
c) 2
d) 4
Answer: c
Clarification: Lancashire boiler has 2 internal flue tubes.
8. Locomotive boiler is a ___________
a) single tube, vertical, externally fired & stationary boiler
b) single tube, horizontal, internally fired& stationary boiler
c) multitubular, horizontal, externally fired & stationary boiler
d) multitubular, horizontal, internally fired & mobile boiler
Answer: d
Clarification: Locomotive boiler is a multitubular, horizontal, internally fired & mobile boiler.
9. Cut-off ratio is the ratio of?
a) cut-off volume to clearance volume
b) clearance volume to cut-off volume
c) volume at cut-off to swept volume
d) swept volume to volume at cut-off
Answer: c
Clarification: Cut-off ratio is the ratio of volume at cut-off to swept volume.
10. The equivalent evaporation is defined as?
a) the ratio of heat actually used in producing the steam to the heat liberated in the furnace
b) the amount of water evaporated or steam produced in kg of fuel burnt
c) the amount of water evaporated from and at 100 degree C into dry & saturated steam
d) none of the mentioned
Answer: c
Clarification: The equivalent evaporation is defined as the amount of water evaporated from and at 100 degree C into dry & saturated steam.
11. The theoretical indicator diagram of a simple steam engine is based upon the assumption that ___________
a) there is no pressure drop due to condensation
b) steam is admitted at boiler pressure & exhausted at condenser pressure
c) the expansion of the steam is hyperbolic
d) all of the mentioned