Doubling the operating voltage of a purely capacitive circuit:

Doubling the operating frequency of a purely capacitive circuit:

A

has no effect on the total circuit current

B

doubles the amount of total current

C

cuts the total current by one-half

D

thrice the amount of total current

E

None of the above

Doubling the operating frequency of a purely inductive circuit:

A

doubles the amount of current through the inductors

B

has no effect on the current through the inductors

C

cuts the current through the inductors one-half

D

increases the current, but by an amount that can be determined only by doing a complete analysis of the circuit

E

None of the above

Doubling the operating frequency of a capacitive circuit:

A

doubles the amount of a capacitive reactance

B

has no effect on the capacitive reactance

C

cuts the capacitive reactance in half

D

multiplies the capacitive reactance by 6.28

E

None of the above

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

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

Which of the following assertions are CORRECT? P: Adding 7 to each entry in a list adds 7 to the mean of the list Q: Adding 7 to each entry in a list adds 7 to the standard deviation of the list R: Doubling each entry in a list doubles the mean of the list S: Doubling each entry in a list leaves the standard deviation of the list unchanged

A

P. Q

B

Q. R

C

P. R

D

R. S

Which one of the following phrases most accurately describes a purely capacitive circuit?

A

Resistances provide the only opposition to current flow

B

Capacitive reactance provides the only opposition to current flow

C

The ac voltage leads the current by 90 degree

D

Combinations of resistance and capacitive reactance provide any opposition to current flow

E

None of the above

In case of purely capacitive circuit, average power = ____ and θ = _____

A

0, 0⁰

B

1, 0⁰

C

1, 90⁰

D

0, 90⁰

Consider the following statements: 1. The voltage developed across the OFF switches of the half-bridge converter is the maximum dc-link voltage. 2. In the full-bridge converter, the voltage across the primary of the transformer is the dc link voltage. 3. The voltage developed across the OFF switches of the full-bridge converter is half the maximum dc-link voltage. Which of the above statements are correct?

A

1, 2 and 3

B

1 and 3 only

C

1 and 2 only

D

2 and 3 only

In ac circuit, resistance 5 ohm is connected with capacitor having capacitive reactance 12 ohm. Supply of 260 V is connected to the circuit. Calculate the current in the circuit.

A

40 A

B

10 A

C

20 A

D

30 A

Doubling the operating voltage of a purely capacitive circuit:

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