This set of Power Plant Questions and Answers for Aptitude test focuses on “Turbine Blading – II”.
1. Governing principle(s) of steam turbine is?
a) Nozzle control governing
b) Throttle governing
c) Bypass governing
d) All of the mentioned
View Answer
Explanation: The various principles of Steam turbine governance are Nozzle control governing, bypass governing, throttle governing, etc.
2. Air-Preheater in a steam power plant _____________
a) Recovers the heat from the flue gases leaving the economiser
b) Improves combustion rate
c) Raises the temperature of the furnace gases
d) All of the mentioned
View Answer
Explanation: Air- preheater in a steam power plant recovers the heat from the flue gases leaving the economiser, improves combustion rate, raises temperature of the furnace gases, etc.
3. What is the definition of the draught system?
a) A device used to pull in air
b) The difference between absolute gas pressure at any point in a gas flow and the ambient atmospheric pressure
c) The sum of the absolute gas pressure at any point in a gas flow and the ambient atmospheric pressure
d) A device used to pull out air
View Answer
Explanation: The difference between absolute gas pressure at any point in a gas flow and the ambient atmospheric pressure is called Draught.
4. A condenser condenses the steam coming out from?
a) Boiler
b) Turbine
c) Economiser
d) Super heater
View Answer
Explanation: The condensing action of a condenser begins when the steam comes out from the Turbine.
5. Water used in the steam plant is used for cooling in _______________
a) Condenser
b) Turbine only
c) Boiler tube
d) Boiler tubes and turbines
View Answer
Explanation: The only condensing process in a steam power plant occurs in the condenser so the water used in the steam plant is used for cooling in Condenser.
6. What is use of the air pumps in the condenser?
a) Remove water
b) Air leaking in the condenser and to maintain the vacuum
c) Maintain atmospheric pressure and the condenser
d) Remove water & Air leaking in the condenser and to maintain the vacuum
View Answer
Explanation: Air pumps used in the condenser are used to maintain the vacuum by letting air outside.
7. Spray ponds are used to cool the warm water coming from the condenser in ________
a) Large power plants
b) Small power plants
c) Medium power plants
d) Both medium and large power plants
View Answer
Explanation: Spray ponds are used to cool the warm water coming from the condenser in small power plants.
8. Evaporative type of condenser has ________
a) Water in pipes surrounded by steam outside
b) Steam and cooling water mixed to give the condensate
c) Steam in pipes surrounded by water
d) None of the mentioned
View Answer
Explanation: Steam in pipes surrounded by water is the evaporative type condenser.
9. Due to friction between the fluid & walls of the nozzle, the expansion process is?
a) reversible
b) irreversible
c) reversible adiabatic
d) irreversible adiabatic
View Answer
Explanation: The friction between the walls of fluid & walls of the nozzle is irreversible & the entire process remains adiabatic.
10. The ratio of actual mass flow through the nozzle to the mass flow if the flow were isentropic is?
a) Coefficient of viscosity
b) Coefficient of velocity
c) Coefficient of discharge
d) None of the mentioned
View Answer
Explanation: Coefficient of discharge is defined as the ratio of actual mass flow through the nozzle to the mass flow if the flow were isentropic.
Sanfoundry Global Education & Learning Series – Power Plant Engineering.
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