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

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

A

Resistances provide the only opposition to current flow

B

Inductive reactance provides the only opposition to current flow

C

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

D

The ac voltage lags the current by 90 degree

E

None of the above

Doubling the operating voltage of a purely capacitive circuit:

A

has no effect on the capacitive reactance

B

doubles the amount of capacitive reactance

C

multiplies the capacitive reactance by 7

D

cuts the capacitive reactance in half

E

None of the above

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

Which one of. the following phrases most accurately describes the nature of a pulsating dc voltage?

A

The voltage remains at one polarity and at a steady level

B

The voltage remains at one polarity but changes value periodically

C

The voltage causes current to flow in two directions at the same time

D

The voltage reverses polarity periodically

E

None of the above

Which one of the following statements most accurately describes the nature of inductive reactance?

A

Inductive reactance is an opposition to current flow in dc circuits

B

Inductive reactance is an opposition to current flow in ac circuits

C

Inductive reactance is another term for counter emf

D

Inductive reactance is a force that tends to overcome the effects of counter emf

E

None of the above

If A.C. voltage is applied to capacitive circuit, the alternating current can flow in the circuit because

A

varying voltage produces the charging and dicharging currents

B

of high peak value

C

charging current can flow

D

discharge current can flow

For a purely inductive circuit which of the following is true?

A

Apparent power is zero

B

Relative power is zero

C

Actual power of the circuit is zero

D

Any capacitance even if present in the circuit will not be charged

At __________ frequencies the parallel R-L circuit behaves as purely resistive.

A

Low

B

Very low

C

High

D

Very high

In a purely inductive circuit

A

Actual power is zero

B

Reactive power is zero

C

Apparent power is zero

D

None of above is zero

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

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

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