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Electrical Engineering Objective Questions { Alternators }

99. The maximum current that can be supplied by an alternator depends on
A. exciter current
B. strength of the magnetic field
C. number of poles
D. speed of the exciter

100.  The regulation of an alternator is likely to be negative in case of
A. lagging power factor of the load
B. leading power factor of the load
C. high speed alternators
D. low speed alternators

101. The regulation of an alternator is
A. the increase in terminal voltage when load is thrown off
B. the reduction in terminal voltage when alternator is loaded
C. the variation of terminal voltage under the condition of maximum and minimum excitation
D. the change in terminal voltage from lagging power factor to leading power factor

102.  An alternator is said to be over excited when it is operating at
A. lagging power factor
B. leading power factor
C. unity power factor
D. lagging to leading power factor

103. An alternator driven by a Francis hydraulic turbine is a alternator
A. low speed
B. medium speed
C. high speed
D. low or medium speed

104. If two alternators are running in proper synchronism and the voltage of one machine is suddenly increased
A. both machines will stop
B. one machine will stop
C. synchronising torque will be produced to restore further synchronism
D. none of the above

105. The power factor of an alternator is determined by its
A. excitation
B. speed
C. primemover
D. load

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