Power Plant Engineering (2171910) MCQs

MCQs of Steam Turbine

Showing 51 to 60 out of 61 Questions
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51.

Blading efficiency is also known as

(a)

stage efficiency
(b)

diagram efficiency
(c)

nozzle efficiency
(d)

none of these
Answer:

Option (b)

52.

The stage efficiency (ηS) is given by (where ηB = Blading efficiency and ηN = Nozzle efficiency)

(a)

ηS = ηB x ηN
(b)

ηS = ηB/ηN
(c)

ηS = ηB/ηN
(d)

none of these
Answer:

Option (a)

53.

Stage efficiency is also known as

(a)

diagram efficiency
(b)

nozzle efficiency
(c)

gross efficiency
(d)

none of these
Answer:

Option (c)

54.

Parson's reaction turbine is a __________ reaction turbine.

(a)

40 percent
(b)

50 percent
(c)

60 percent
(d)

70 percent
Answer:

Option (b)

55.

The ratio of the isentropic heat drop to the heat supplied, is called

(a)

Reheat factor
(b)

Stage efficiency
(c)

Internal efficiency
(d)

Rankine efficiency
Answer:

Option (d)

56.

The reheat factor is the ratio of the

(a)

cumulative heat drop to the isentropic heat drop
(b)

isentropic heat drop to the heat supplied
(c)

total useful heat drop to the total isentropic heat drop
(d)

none of the mentioned
Answer:

Option (a)

57.

The value of the reheat factor varies from

(a)

1.02 to 1.06
(b)

1.08 to 1.10
(c)

1.2 to 1.6
(d)

1.6 to 2
Answer:

Option (a)

58.

The reheat factor depends upon

(a)

initial pressure and superheat
(b)

exit pressure
(c)

turbine stage efficiency
(d)

all of these
Answer:

Option (d)

59.

Reheating of steam in a turbine

(a)

increases the workdone through the turbine
(b)

increases the efficiency of the turbine
(c)

reduces wear on the blades
(d)

all of these
Answer:

Option (d)

60.

The steam turbine can be governed by the following methods except

(a)

throttle governing
(b)

nozzle governing
(c)

by pass governing
(d)

reaction governing
Answer:

Option (d)

Showing 51 to 60 out of 61 Questions
3 4 5 6 7