Power System - I (3140914) MCQs

MCQs of Electrical Supply Systems

Showing 51 to 60 out of 69 Questions
3 4 5 6 7
51.
A booster is a
(a) Series wound DC generator
(b) Shunt wound DC generator
(c) Cumulative compound wound DC generator
(d) Differential compound wound DC generator
Answer:

Option (a)

52.
Booster is connected in
(a) Parallel with the feeder
(b) Series with the feeder
(c) Either (a) or (b)
(d) None of above
Answer:

Option (b)

53.
The booster
(a) Is a series wound DC generator driven by DC shunt motor
(b) Is a low voltage and high current generator operating on straight or linear   portion of its voltage current characteristics
(c) Is a high voltage and low current machine
(d) Both (a) and (b)
Answer:

Option (d)

54.
The booster is inserted in the circuit to
(a) Reduce current
(b) Increase current
(c) Reduce voltage drop
(d) Compensate voltage drop
Answer:

Option (d)

55.
Floating neutral in a three phase supply is considered undesirable as it causes
(a) High voltage across the load
(b) Low voltage across the load
(c) Unequal line voltages across the load
(d) None of above
Answer:

Option (c)

56.
Single phase AC distributor supplies two single phase loads as shown in the figure. The voltage drop from A to C is
(a) 4.5 V
(b) 31.5 V
(c) 30 V
(d) 20 V
Answer:

Option (c)

57.
Transmitting power remaining the same, if the supply voltage of a DC 2-wire distributor is doubled then saving in copper will be
(a) 25%
(b) 50%
(c) 75%
(d) 100%
Answer:

Option (b)

58.
In a 2-wire DC feeder, voltage drop per wire is 2.5%, transmission efficiency of the feeder will be
(a) 97.50%
(b) 95%
(c) 93.75%
(d) 98.75%
Answer:

Option (b)

59.
For a given amount of power to be transmitted over a certain distance with fixed power loss, the volume of copper required is
(a) Proportional to voltage
(b) Inversely proportional to voltage
(c) Inversely proportional to square of voltage and power factor
(d) Proportional to square of voltage and power factor
Answer:

Option (c)

60.
Which of the following distribution system is most economical?
(a) DC system
(b) Single phase AC system
(c) Three phase 3-wire AC system
(d) Three phase 4-wire AC system
Answer:

Option (a)

Showing 51 to 60 out of 69 Questions
3 4 5 6 7