Power Plant Engineering (2171910) MCQs

MCQs of Steam Turbine

Showing 31 to 40 out of 61 Questions
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31.

Curtis turbine is a

(a)

simple reaction turbine
(b)

velocity compounded turbine
(c)

pressure compounded turbine
(d)

pressure-velocity compounded turbine
Answer:

Option (d)

32.

The blade speed ratio of impulse turbine is given as ___________.

(a)

(Blade velocity) / (Steam velocity at inlet)
(b)

(Blade velocity) / (Steam velocity at exit)
(c)

(Steam velocity at inlet) / (Blade velocity)
(d)

(Steam velocity at exit) / (Blade velocity)
Answer:

Option (a)

33.

The following are the method for compounding except

(a)

velocity compounding
(b)

pressure compounding
(c)

volume compounding
(d)

reaction turbine
Answer:

Option (c)

34.

The compounding of turbines is done in order to

(a)

reduce speed of rotor
(b)

improve efficiency
(c)

reduce exit losses
(d)

all of these
Answer:

Option (d)

35.

In order to reduce the rotor speed of an impulse turbine, the method employed is

(a)

velocity compounding
(b)

pressure compounding
(c)

pressure-velocity compounding
(d)

all of these
Answer:

Option (d)

36.

In velocity compounding, steam is passed through

(a)

fixed nozzle-moving blades-fixed blades-moving blades
(b)

fixed nozzle-moving blades-fixed nozzles-moving blades
(c)

moving blades-fixed nozzles- fixed blades-moving blades
(d)

fixed blades-moving blades-fixed nozzles- moving blades
Answer:

Option (a)

37.

In a velocity compounded impulse turbine, when steam flows through the second row of moving blades

(a)

velocity increases
(b)

velocity decreases
(c)

velocity remains constant
(d)

pressure remains constant
Answer:

Option (b)

38.

In pressure compounding, steam is passed through

(a)

fixed nozzle-moving blades-fixed blades-moving blades
(b)

fixed nozzle-moving blades-fixed nozzles-moving blades
(c)

moving blades-fixed nozzles- fixed blades-moving blades
(d)

fixed blades-moving blades-fixed nozzles- moving blades
Answer:

Option (b)

39.

In pressure velocity compounding

(a)

moving blades are used
(b)

fixed nozzles are used
(c)

fixed blades are used
(d)

all of the given are used
Answer:

Option (d)

40.

The efficiency of a pressure-velocity compounded impulse turbine is __________ as compared to pressure compounded impulse turbine.

(a)

same
(b)

less
(c)

more
(d)

can't predict
Answer:

Option (b)

Showing 31 to 40 out of 61 Questions
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