ONLINE EE Multiple Choice Questions – Economics of Power Generation PART 3

31. A steam power station
will run with maximum efficiency when it is run
(A) at low steam pressures
(B) on pulverized coal
(C) at
higher speeds
(D) near
full load.

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32. Which of the following is likely to result in
lower efficiency of a power station ?
(A) Varying
loads
(B) Low
voltage generation
(C) Low
turbine speeds
(D) Non-automatic
controls.

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Questions 33 to 36 refer to the following
information.

The following factors are associated with power
plant operation
I.
High efficiency
II.
High availability
III. Quick
starting
IV. Low
capital cost.

33. Which factor is least
important for base load plants ?
(A)
I
(B) II
(C) III
(D) IV.

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34. Which two factors are
of significant requirement for base load plant ?
(A) I and II only
(B) III and IV only
(C) II and III only
(D) I and IV only.

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35. Which two factors are
of importance for peak load plant ?
(A) I and III only
(B) II and III only
(C) I and IV only
(D) III and IV only.

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36. Which factors are
favorable to a diesel power plant as compared to a steam power plant ?
(A) I and III only
(B) I, II and III
only
(C) II, III and IV only
(D) I, II. Ill
and IV.

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37. In a 440 V system, in
order to obtain the minimum cost and maximum benefits, the capacitor should be
installed
(A) at
the load
(B) near
the transformer
(C) any
where in the circuit
(D) near
the earthling point.

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38. In case of medium sized
induction motor, the power factor will be maximum at
(A) No load
(B)
50% load
(C)
Full load
(D) Power
factor remains constant at all loads.

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39. A
coaxial line is filled with a dielectric of relative permitivity 9. If C
denotes the velocity of propagation in free space, the velocity of propagation
in the line will be
(A) 3 C
(B)
C
(C) C / 3
(D)
C / 9.

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40. A direct voltage is
applied to a peak diode voltmeter in which scale is calibrated to read rms
voltage of a sine wave. If the meter reading is 36 V rms, the value of the
applied direct voltage is
(A) 25 V
(B)
36 V
(C) 51 V
(D)
72 V.

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41. A power station has annual load factor of
50% and capacity factor of 40%. If the maximum demand is 15 MW, the reserve
capacity of the plant is
(A)
1250 kw
(B) 2500 kw
(C) 3750 kw
(D)
4750 kw.

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42. Which of the following will not contribute
to low power-factor ?
(A) Partially loaded induction motors
(B) Replacement of fluorescent lamps with
incandescent lamps
(C) Use of rectifiers instead of synchronous
motor-generator sets for dc power supply
(D) Increased installation of electronic
equipments, air- conditioning units, etc.

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43. Which of the following may not be the
effect of low plant operating power factor ?
(A) Over loaded transformers
(B) Reduced voltage level
(C) Improved illumination from lighting
(D) Over loaded cables.

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44. Identify the incorrect relation
(A)
power
factor = KW / kVA
(B) kW = kVA x power factor
(C) kVA
x kW = power factor
(D) kVA = kW / power
factor.

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45. The power factor of a system on a 460 V, 3
phase, 60 Hz, in which the ammeter indicates 100 amp and the watt meter reads
62 kW will be
(A) 0.95
(B)
0.78
(C) 0.65
(D)
0.55.

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ONLINE EE Multiple Choice Questions - Economics of Power Generation PART 4
ONLINE EE Multiple Choice Questions - Economics of Power Generation PART 2

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