Electrical Engineering in Power Plant - Set 03 - ObjectiveBooks

# 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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