Power System - I (3140914) MCQs

MCQs of Conventional Generation, Load Curves and Tariffs

Showing 31 to 40 out of 425 Questions
1 2 3 4 5 6
31.
Water hammer occurs in
(a) Surge tank
(b) Penstock
(c) Turbine casing
(d) Draft tube
Answer:

Option (b)

32.
In a medium or high head hydro-electric power station, a surge tank is provided to
(a) Reduce the length of the penstock pipes
(b) Augment water at the forebay
(c) Control the pressure variations in the penstock pipes due to sudden load changes
(d) Control the water flow through the turbine
Answer:

Option (c)

33.
The draft tube is provided to
(a) Raise the water surface of the stream to create an artificial head
(b) Reduce the effect of water hammer
(c) Increase the acting head on the water wheel
(d) None of the above
Answer:

Option (c)

34.
For low head power plants turbine generally used is
(a) Pelton turbine
(b) Francis turbine
(c) Either (a) or (b)
(d) Kaplan turbine
Answer:

Option (d)

35.
For high head and low discharge the water turbine used is
(a) Pelton wheel
(b) Kaplan turbine
(c) Francis turbine
(d) Propeller turbine
Answer:

Option (a)

36.
Francis, Kaplan and Propeller turbines fall under the category of
(a) Impulse turbines
(b) Reaction turbines
(c) Reaction impulse turbines
(d) None of above
Answer:

Option (b)

37.
Outward radial flow turbines
(a) Are reactions turbines
(b) Are impulse turbines
(c) May be impulse or reaction turbines
(d) Are partly reaction and partly impulse turbines
Answer:

Option (c)

38.
The specific speed (Ns) of a turbine is given by the expression
(a) Ns = N√P/H0.75
(b) Ns = P√N/H1.5
(c) Ns = N√P/H1.25
(d) Ns = P√NH1.5
Answer:

Option (c)

39.
The specific speed of a water turbine is the speed at which the turbine develops
(a) Maximum horse power
(b) Unit horse power at all heads
(c) Unit horse power at unit head
(d) Minimum horse power
Answer:

Option (c)

40.
The specific speeds of Kaplan, Francis and Pelton turbines are in
(a) Increasing order
(b) Decreasing order
(c) None of above
(d) Insufficient data
Answer:

Option (b)

Showing 31 to 40 out of 425 Questions
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