Power System - II (3150911) MCQs

MCQs of Basic Principles

Showing 121 to 130 out of 135 Questions
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121.
Constant voltage transmission has the drawback of
(a) Requires large cross section conductor for transmission of same power
(b) Increased risk of  interruption of supply
(c) Reduced power factor at the time of moderate and heavy load
(d) All of above
Answer:

Option (b)

122.
Constant voltage transmission has the advantage of
(a) Availability of steady voltage at all loads at the receiving end
(b) Possibility of better protection for the line due to possible use of higher terminal reactance
(c) Possibility of caring increase the power for a given conductor size in case of long distance heavy power transmission
(d) All of above
Answer:

Option (d)

123.
Constant voltage transmission has the advantage of
(a) Increase of short circuit current of the system
(b) Large reserve of line in case of line trouble
(c) Improvement of power factor at the time of moderate and heavy load
(d) All of above
Answer:

Option (c)

124.
A synchronous phase modifier supplies
(a) Both active and reactive power
(b) Both lagging and leading reactive power
(c) Inductive reactive power only
(d) Active power only
Answer:

Option (b)

125.
A synchronous machine has higher capacity for
(a) Leading power factor
(b) Lagging power factor
(c) Power factor of the load
(d) None of above
Answer:

Option (a)

126.
A synchronous phase modifier as compared to synchronous motor of the same rating has
(a) Larger shaft diameter and higher speed
(b) Smaller shaft diameter and higher speed
(c) Larger shaft diameter  and smaller speed
(d) Smaller shaft diameter and smaller speed
Answer:

Option (b)

127.
Phase modifier is normally installed in case of
(a) Short transmission line
(b) Medium transmission line
(c) Long transmission line
(d) Any length of transmission line
Answer:

Option (c)

128.
Which of the following statement is not true?
(a) Synchronous phase modifiers are installed at sending end
(b) Synchronous phase modifiers are installed at load end
(c) Synchronous phase modifiers are nothing but synchronous motors
(d) Synchronous phase modifiers do not carry load
Answer:

Option (a)

129.
Over excited synchronous phase modifier
(a) Draws a lagging current
(b) Draws a leading current
(c) Supplies a leading current
(d) Supplies a lagging current
Answer:

Option (b)

130.
Capacitors are used in power system to
(a) Improve supply power factor
(b) Improve voltage regulation
(c) Change the load characteristics
(d) All of above
Answer:

Option (b)

Showing 121 to 130 out of 135 Questions
9 10 11 12 13 14