Practice Test: Question Set - 03
1. Blowing down of boiler water is the process
- (A) To reduce the boiler pressure
- (B) To increase the steam temperature
- (C) To control the solid concentration in the boiler
water by removing some of the concentrated saline water
- (D) None of the above
2. The proper indication of incomplete combustion is
- (A) High CO content in flue gases at exit
- (B) High CO2 content in flue gases at exit
- (C) High temperature of flue gases
- (D) The smoking exhaust from chimney
3. The overall efficiency of thermal power plant is equal to
- (A) Rankine cycle efficiency
- (B) Carnot cycle efficiency
- (C) Regenerative cycle efficiency
- (D) Boiler efficiency × turbine efficiency × generator
efficiency
4. Regenerative cycle thermal efficiency
- (A) Is always greater than simple Rankine thermal
efficiency
- (B) Is greater than simple Rankine cycle thermal
efficiency only when steam is bled at particular pressure
- (C) Is same as simple Rankine cycle thermal efficiency
- (D) Is always less than simple Rankine cycle thermal
efficiency
5. Economizer is used to heat
- (A) Air
- (B) Feed water
- (C) Flue gases
- (D) All above
6. The draught produced by chimney of given height at given outside temperature
- (A) Decreases if the chimney gas temperature increases
- (B) Increases if the chimney gas temperature increases
- (C) Remains same irrespective of chimney gas
temperature
- (D) May increase or decrease
7. The artificial draught normally is designed to produce
- (A) Less smoke
- (B) More draught
- (C) Less chimney gas temperature
- (D) All of the above
8. The critical pressure ratio of a convergent nozzle is defined as
- (A) The ratio of outlet pressure to inlet pressure of
nozzle
- (B) The ratio of inlet pressure to outlet pressure of
nozzle
- (C) The ratio of outlet pressure to inlet pressure only
when mass flow rate per unit area is minimum
- (D) The ratio of outlet pressure to inlet
pressure only when mass flow rate = c
9. Curtis turbine is
- (A) Reaction steam turbine
- (B) Pressure velocity compounded steam turbine
- (C) Pressure compounded impulse steam turbine
- (D) Velocity compounded impulse steam turbine
10. In jet type condensers
- (A) Cooling water passes through tubes and steam
surrounds them
- (B) Steam passes through tubes and cooling water
surrounds them
- (C) Steam and cooling water mix
- (D) Steam and cooling water do not mix
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