Practice Test: Question Set - 08
1. The pressure at the furnace is minimum in case of
- (A) Forced draught system
- (B) Induced draught system
- (C) Balanced draught system
- (D) Natural draught system
2. The modern steam turbines are
- (A) Impulse turbines
- (B) Reaction turbines
- (C) Impulse-reaction turbines
- (D) None of the above
3. Carnot cycle comprises of
- (A) Two isentropic processes and two constant volume
processes
- (B) Two isentropic processes and two constant pressure
processes
- (C) Two isothermal processes and three constant
pressure processes
- (D) None of the above
4. The percentage O2 by volume in atmosphere air is
- (A) 21 %
- (B) 23 %
- (C) 77 %
- (D) 79 %
5. In a boiler installation the natural draught is produced
- (A) Due to the fact that furnace gases being
light go through the chimney giving place to cold air from outside to rush in
- (B) Due to the fact that pressure at the grate
due to cold column is higher than the pressure at the chimney base due to hot
column
- (C) Due to the fact that at the chimney top the
pressure is more than its environmental pressure
- (D) All of the above
6. The ratio of exit pressure to inlet pressure for maximum mass flow rate per unit area of steam through a nozzle when steam is initially dry saturated is
- (A) 0.6
- (B) 0.578
- (C) 0.555
- (D) 0.5457
7. The cooling section in the surface condenser
- (A) Increases the quantity of vapor extracted along
with air
- (B) Reduces the quantity of vapor extracted
along with air
- (C) Does not affect vapor quantity extracted but
reduces pump capacity of air extraction pump
- (D) None of the above
8. Economisers improve boiler efficiency by
- (A) 1 to 5 %
- (B) 4 to 10 %
- (C) 10 to 12 %
- (D) None of these
9. Travelling grate stoker can burn coals at the rates of
- (A) 50-75 kg/m per hour
- (B) 75-100 kg/m per hour
- (C) 100-150 kg/m per hour
- (D) 150-200 kg/m2 per hour
10. Parson's turbine is
- (A) Pressure compounded steam turbine
- (B) Simple single wheel, impulse steam turbine
- (C) Simple single wheel reaction steam turbine
- (D) Multi wheel reaction steam turbine
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