Practice Test: Question Set - 05
1. Steam turbines are governed by the following methods
- (A) Throttle governing
- (B) Nozzle control governing
- (C) By-pass governing
- (D) All of the above
2. Belt conveyor can be used to transport coal at inclinations up to
- (A) 30°
- (B) 60°
- (C) 80°
- (D) 90°
3. Caking coals are those which
- (A) Burn completely
- (B) Burn freely
- (C) Do not form ash
- (D) Form lumps or masses of coke
4. The amount of air which is supplied for complete combustion is called
- (A) Primary air
- (B) Secondary air
- (C) Tertiary air
- (D) None of the above
5. Reheat factor is the ratio of
- (A) Isentropic heat drop to useful heat drop
- (B) Adiabatic heat drop to isentropic heat drop
- (C) Cumulative actual enthalpy drop for the stages to
total is isentropic enthalpy heat drop
- (D) None of these
6. The percentage O2 by Weight in atmospheric air is
- (A) 18 %
- (B) 23 %
- (C) 77 %
- (D) 79 %
7. The maximum percentage gain in Regenerative feed heating cycle thermal efficiency
- (A) Increases with number of feed heaters
increasing
- (B) Decreases with number of feed heaters
increasing
- (C) Remains same unaffected by number of feed
heaters
- (D) None of the above
8. The draught produced, for a given height of the chimney and given mean temperature of chimney gases
- (A) Decreases with increase in outside air
temperature
- (B) Increases with increase in outside air
temperature
- (C) Remains the same irrespective of outside air
temperature
- (D) May increase or decrease with increase in outside
air temperature
9. The efficiency of chimney is approximately
- (A) 80 %
- (B) 40 %
- (C) 20 %
- (D) 0.25 %
10. Reheat factor in steam turbines depends on
- (A) Exit pressure only
- (B) Stage efficiency only
- (C) Initial pressures and temperature only
- (D) All of the above
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