In an RL circuit, part of the power is resistive and part is reactive.

Given below are certain statements regarding the average power dissipated in different types of circuits. Identify the correct option. A. Maximum power dissipation occurs in the case of the resistive circuit and when the LCR circuit is at resonance. B. In the case of a purely inductive circuit, no power is dissipated. C. In the case of the RC circuit, power is dissipated in resistor and capacitor both.

A

Both A and B are correct

B

Both B and C are correct

C

Both A and C are correct

D

Only A is correct

Under the condition for 3 phase alternator, maximum active power output, the delivered reactive power output is ________ while under maximum reactive power output, the delivered reactive power is ________

A

negative, negative

B

positive, negative

C

negative, positive

D

positive, positive

A power factor of 1 indicates a purely reactive circuit, and a power factor of 0 indicates a purely resistive circuit.

A

True

B

False

Referring this circuit, determine the maximum output voltage when a single pulse is applied as shown. The total resistance is 60 Ω.
Time Response of Reactive Circuits mcq question image

Time Response of Reactive Circuits mcq question image

A

2.73 V

B

27.33 V

C

30 V

D

2.67 V

Referring to the give circuit, the output will.
Time Response of Reactive Circuits mcq question image

A

Decay to zero at the end of the pulse

B

Reach 6 V at the end of the pulse

C

Reach 3.78 V at the end of the pulse

D

Reach 5.16 V at the end of the pulse

The apparent power drawn by an A.C. circuit is 10 kVA and active power is 8 kW. The reactive power in the circuit is

A

4 kVAR

B

6 kVAR

C

8 kVAR

D

16 kVAR

Referring to the bellow figure, determine the voltage level that the output will reach during the pulse.
Time Response of Reactive Circuits mcq question image

A

0 V

B

15 V

C

6.3 V

D

9.45 V

Referring this figure, on the falling edge.
Time Response of Reactive Circuits mcq question image

A

The resistor voltage drops to -5 V and then goes back to zero exponentially

B

The resistor voltage jumps to -5 V and then goes back to zero exponentially

C

The capacitor voltage remains constant

D

The resistor voltage jumps to +5 V and then decreases exponentially to zero

In comparing the operation of the half-controlled 2-pulse circuit with that of the fully-controlled circuit, which of the following statements are evident? 1. Since half the thyristors are replaced by diodes, a half-controlled converter costs less than a fully-controlled converter. 2. Due to the freewheeling action with a half-controlled bridge-circuit power factor is improved in half-controlled converters. 3. The AC supply current is more distorted due to its zero periods with the half-controlled circuit, compared to a fully-controlled bridge circuit. Select the correct answer using the code given below :

A

1 and 2 only

B

2 and 3 only

C

1 and 3 only

D

1, 2 and 3

In a transformer, the resistive drop is 2% and reactive drop is 5%. What will be its regulation at full load unity power factor?

A

1%

B

5%

C

2%

D

7%

In an RL circuit, part of the power is resistive and part is reactive.

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