A.c fundamentals, circuits and circuit theory

41. Which of the following statements pertains to resistors only?

Can dissipate considerable amount of power
Can act as energy storage devices
Connecting them in parallel increases the total value
Oppose sudden changes in voltage

Detailed SolutionWhich of the following statements pertains to resistors only?

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42. A phasor is

A line which represents the magnitude and phase of an alternating quantity
A line representing the magnitude and direction of an alternating quantity
A colored tag or band for distinction between different phases of a 3-phase supply
An instrument used for measuring phases of an unbalanced 3-phase load

Detailed SolutionA phasor is

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43. The peak value of a sine wave is 200 V. Its average value is

127.4 V
141.4 V
282.8 V
200 V

Detailed SolutionThe peak value of a sine wave is 200 V. Its average value is

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44. The best place to install a capacitor is

Very near to inductive load
Across the terminals of the inductive load
Far away from the inductive load
Any where

Detailed SolutionThe best place to install a capacitor is

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45. The square waveform of current has following relation between r.m.s. value and average value.

r.m.s. value is equal to average value
r.m.s. value of current is greater than average value
r.m.s. value of current is less than average value
None of the above

Detailed SolutionThe square waveform of current has following relation between r.m.s. value and average value.

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46. If two sinusoids of the same frequency but of different amplitudes and phase angles are subtracted, the resultant is

A sinusoid of the same frequency
A sinusoid of half the original frequency
A sinusoid of double the frequency
Not a sinusoid

Detailed SolutionIf two sinusoids of the same frequency but of different amplitudes and phase angles are subtracted, the resultant is

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47. Capacitors for power factor correction are rated in

kW
kVA
kV
kVAR

Detailed SolutionCapacitors for power factor correction are rated in

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48. Capacitive susceptance is a measure of

Reactive power in a circuit
The extent of neutralization of reactive power in a circuit
A purely capacitive circuit's ability to pass current
A purely capacitive circuit's ability to resist the flow of current

Detailed SolutionCapacitive susceptance is a measure of

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49. In a highly capacitive circuit the

Apparent power is equal to the actual power
Reactive power is more than the apparent power
Reactive power is more than the actual power
Actual power is more than its reactive power

Detailed SolutionIn a highly capacitive circuit the

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50. Power factor of the following circuit will be zero

Resistance
Inductance
Capacitance
Both B and C

Detailed SolutionPower factor of the following circuit will be zero

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