Alternating Current Test

Result

Alternating Current Test - 52

Score
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Weekly Quiz Competition

Question 1
4 / -1

In ac circuit of capacitance the current from potential is

A
Forward

B
Backward

C
Both are in the same phase

D
None of the above
Question 2
4 / -1

A coil of 200 Ω resistance and 1.0 H inductance is connected to an ac source of frequency 200 /2π Hz. Phase angle between potential and current will be

A
30°

B
90°

C
45°

D
0°

Solution
Question 3
4 / -1

Radio frequency choke uses core of

A
Air

B
Iron

C
Air and iron

D
None of these
Question 4
4 / -1

The current in series LCR circuit will be maximum when ω is

A
As large as possible

B
Equal o natural frequency of LCR system

C
√LC

D
Question 5
4 / -1

In a circuit L, C and R are connected in series with an alternating voltage source of frequency f. The current leads the voltage by 45°. The value of C is

A

B

C

D

Solution
Question 6
4 / -1

In an ac circuit the current

A
Always leads the voltage

B
Always lags behind the voltage

C
Is always in phase with the voltage

D
May lead or lag behind or be in phase with the voltage
Question 7
4 / -1

In a choke coil, the reactance X_L and resistance R are such that

A
X_L = R

B
X_L>>R

C
X_L<< R

D
X_L = ∞

Solution
Question 8
4 / -1

A transistor-oscillator using a resonant circuit with an inductor L (of negligible resistance) and a capacitor C in series produce oscillation of frequency f. If L is doubled and C is changed to 4C, the frequency will be

A

B

C

D

Solution
Question 9
4 / -1

A coil of inductive reactance 31 Ω has a resistance of 8 Ω. It is placed in series with a condenser of capacitative reactance 25 Ω. The combination is connected to an ac source of 110 volt. The power factorof the circuit is

A
0.80

B
0.33

C
0.56

D
0.64

Solution
Question 10
4 / -1

In an LCR series resonant circuit which one of the following cannot be the expression for the Q–factor

A

B

C

D