Doubling the operating frequency of a purely capacitive circuit:

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 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

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

Doubling the operating frequency of an inductive circuit:

A

has no effect on the inductive reactance

B

doubles the amount of inductive reactance

C

multiplies the inductive reactance by 6.28

D

cuts the inductive reactance in half

E

None of the above

A capacitor and a resistor are connected in series to a sine wave generator. The frequency is set so that the capacitive reactance is equal to the resistance and, thus, an equal amount of voltage appears across each component. If the frequency is increased

A

VR > VC

B

VC > VR

C

VR = VC

D

VR and VC = 0

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

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

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

Doubling the operating frequency of a purely capacitive circuit:

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