TURBINES 21-40 Flashcards
Which of the following is a characteristic of a
reaction turbine?
a) It operates at supersonic speeds
b) It requires a low head of fluid
c) It changes the direction of fluid flow
d) It has a fixed geometry
c) It changes the direction of fluid flow
What is the purpose of the guide vanes in a
turbine?
a) To increase pressure
b) To decrease pressure
c) To direct fluid flow
d) To extract energy from the fluid
c) To direct fluid flow
Which type of turbine is commonly used in
marine propulsion?
a) Pelton turbine
b) Kaplan turbine
c) Francis turbine
d) Turgo turbine
b) Kaplan turbine
What is the main advantage of using a reaction
turbine over an impulse turbine?
a) Higher efficiency
b) Lower initial cost
c) Ability to operate at low heads
d) Greater simplicity
a) Higher efficiency
Which of the following factors does NOT affect
the efficiency of a steam turbine?
a) Steam temperature
b) Steam pressure
c) Turbine speed
d) Ambient humidity
d) Ambient humidity
What is the term for the speed at which a turbine
operates most efficiently?
a) Maximum speed
b) Critical speed
c) Optimal speed
d) Rated speed
c) Optimal speed
Which type of turbine is commonly used in smallscale hydropower applications?
a) Pelton turbine
b) Kaplan turbine
c) Francis turbine
d) Crossflow turbine
d) Crossflow turbine
What is the primary disadvantage of using a
steam turbine for power generation?
a) High maintenance requirements
b) Limited fuel availability
c) Environmental pollution
d) Slow response to load changes
d) Slow response to load changes
Which of the following is NOT a component of a
wind turbine?
a) Rotor
b) Tower
c) Nozzle
d) Generator
c) Nozzle
What is the purpose of the draft tube in a turbine?
a) To increase pressure
b) To decrease pressure
c) To direct fluid flow
d) To extract energy from the fluid
b) To decrease pressure
Which type of turbine is commonly used in
aircraft engines?
a) Pelton turbine
b) Kaplan turbine
c) Francis turbine
d) Gas turbine
d) Gas turbine
What is the main advantage of using a Kaplan
turbine over other types of turbines?
a) Higher efficiency at low heads
b) Lower initial cost
c) Greater simplicity
d) Ability to operate in variable flow conditions
d) Ability to operate in variable flow conditions
What is the purpose of the diffuser in a turbine?
a) To increase pressure
b) To decrease pressure
c) To direct fluid flow
d) To extract energy from the fluid
b) To decrease pressure
Which of the following factors affects the
efficiency of a wind turbine?
a) Wind speed
b) Wind direction
c) Humidity
d) Ambient temperature
a) Wind speed
What is the term for the ratio of the actual power
output of a turbine to its theoretical power output?
a) Efficiency ratio
b) Performance ratio
c) Specific speed
d) Power coefficient
a) Efficiency ratio
