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Electrical Engineering Objective Questions { Complex AC }



99. The safest value of current the human body can carry for more than 3 second is
A. 4 mA
B. 9 mA
C. 15 mA
D. 25 mA

100. A pure inductance connected across 250 V, 50 Hz supply consumes 100 W. This consumption can be attributed to
A. the big size of the inductor
B. the reactance of the inductor
C. the current flowing in the inductor
D. the statement given is false

101.  The input of an A.C. circuit having power factor of 0.8 lagging is 40kVA. The power drawn by the circuit is
A. 12 kW
B. 22 kW
C. 32 kW
D. 64 kW

102.  The effective resistance of an iron-cored choke working on ordinary supply frequency is more than its true resistance because of
A. iron loss in core
B. skin effect
C. increase in temperature
D. capacitive effect between adjecent coil

103. 1n an A.C. circuit, a low value of kVAR turns compared with kW indicates
A. low efficiency
B. high power factor
C. unity power factor
D. maximum load current

104. 1n A.C. circuits, laminated iron is invariable used in order to
A. reeduce eddy current loss
B. increase heat radiation
C. make assembly cheap and easier
D. reduce circuit permeability

105.  The ratio of active power to apparentpower is known as ..... factor
A. demand
B. load
C. power
D. form

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