This set of Power Plant Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Steam Turbines Basics – I”.
1. A steam turbine converts the output from a steam generator into ____________
a) Shaft work
b) Turbine work
c) Mechanical work
d) None of the mentioned
View Answer
Explanation: A steam turbine is a device that converts the energy of high-pressure, high-temperature steam supplied by a steam generator into shaft work.
2. The energy conversion occurring in a steam turbine is a ______ step process.
a) 1
b) 2
c) 3
d) 4
View Answer
Explanation: The high pressure steam first expands in a nozzle, gains velocity & then loses this velocity when it impinges on the blades.
3. A steam turbine is basically an assemblage of ____________
a) nozzle & condenser
b) blades & condenser
c) nozzle & blades
d) nozzle & fans
View Answer
Explanation: A steam turbine is a device that converts the energy of high-pressure, high-temperature steam supplied by a steam generator into shaft work. The high pressure steam first expands in a nozzle, gains velocity & then loses this velocity when it impinges on the blades.
4. Depending on whether the back pressure is below or equal to the atmospheric pressure, how many types of turbines do exist?
a) 1
b) 2
c) 3
d) 4
View Answer
Explanation: Depending on whether the back pressure is below or equal to the atmospheric pressure, there are two types of turbines that exist- condensing & non-condensing turbines.
5. The overall steam turbine generator arrangement of a power plant is designated as ________ compound on the basis of shaft orientation.
a) tandem
b) cross
c) tandem & cross
d) none of the mentioned
View Answer
Explanation: The overall steam turbine generator arrangement of a power plant is designated as tandem or cross-compound on the basis of shaft orientation.
6. A ______ is a duct through which velocity of a fluid increases at the expense of pressure.
a) orifice
b) nozzle
c) jet
d) diffuser
View Answer
Explanation: A nozzle is a duct through which the velocity of a fluid increases at the expense of pressure.
7. A duct which decreases the velocity of fluid & causes a corresponding increase in pressure is called?
a) nozzle
b) diffuser
c) jet
d) orifice
View Answer
Explanation: A duct which decreases the velocity of fluid & causes a corresponding increase in pressure is called a diffuser.
8. A regenerative steam cycle renders ____________
a) decreased work output per unit mass of steam
b) increased thermal efficiency
c) increased work output per unit mass of steam
d) decreased work output per unit mass of steam as well as increased thermal efficiency
View Answer
Explanation: The decreased work output per unit mass of steam as well as increased thermal efficiency.
9. The reheat factor is the ratio of the ____________
a) total useful heat drop to the total isentropic heat drop
b) cumulative heat drop to the isentropic heat drop
c) isentropic heat drop to the heat supplied
d) none of the mentioned
View Answer
Explanation: The ratio of cumulative heat drop to the isentropic heat drop is called the reheat factor.
10. Thermal equilibrium means that the flow of steam is ____________
a) hyperbolic
b) isothermal
c) isentropic
d) polytropic
View Answer
Explanation: When the steam flow is isentropic it is thermal equilibrium condition.
Sanfoundry Global Education & Learning Series – Power Plant Engineering.
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