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Electrical Engineering Objective Questions { Complex AC }



57.  Pure inductive circuit
A. consumes some power onaverage
B. (d) does not take power at all from a line
C. takes power from the line during some part of the cycle and then returnsback to it during other part of the cycle
D. none of the above
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58.  Inductance affects the direct current flow
A. only at the timeof turning off
B. only at the time of turning on
C. at the time of turning on and off
D. at all the time of operation
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59.  Inductance of a coil varies
A. directly as the cross-sectional area of magnetic core
B. directly as square of number of turns
C. directly as the permeability of the core
D. All the above
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60.  All the rules and laws of D.C. circuit also apply to A.C. circuit containing
A. capacitance only
B. inductance only
C. resistance only
D. all above
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61.  Time constant of an inductive circuit
A. increases with increase of inductance and decrease of resistance
B. increases with the increase of inductance and the increase of resistance
C. increases with decrease of inductance and decrease of resistance
D. increases with decrease of inductance and increase of resistance
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62.  Power factor of an inductive circuit is usually improved by connecting capacitor to it in
A. parallel
B. series
C. either (a) or (b)
D. ncne of the above
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63.  In a highly capacitive circuit the
A. apparent power is equal to the actual power
B. reactive power is more than the apparent power
C. reactive power is more than the actual power
D. actual power is more than its reactive power
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