Alternating Current Test

Result

Alternating Current Test - 25

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Weekly Quiz Competition

Question 1
4 / -1

The average power dissipated in AC circuit is 2 W. If a current flowing through a circuit is 2 A impedance is 1Ω, what is the power factor of the AC circuit?

A
0.5

B
1

C
zero

D
1/√2

Solution
Question 2
4 / -1

If V_AB =V_Ac, then X is

A
in resonance with inductance and capacitance

B
in resonance with resistance and capacitance

C
in resonance with inductance and resistance

D
None of the above
Question 3
4 / -1

A series R-C circuit is connected to AC voltage source. Consider two cases (A) when C is without a dielectric medium and (B)when C is filled with dielectric of constant 4. The current I_R through the resistor and voltage V_C across the capacitor are compared in the two cases. Which of the following is/are true?

A

B

C

D

Solution
Question 4
4 / -1

In the L-C-R circuit shown, the impedance is

A
500Ω

B
300Ω

C
100Ω

D
200Ω

Solution
Question 5
4 / -1

In a series L-C-R circuit R = 200 Ω and the voltage and the frequency of the main supply is 220V and 50 Hz respectively. On taking out the capacitance from the circuit the current lags behind the voltage by 30°. On taking out the inductor from the circuit the current leads the voltage by 30°. The power dissipated in the L-C-R circuit is

A
305 W

B
210 W

C
zero

D
242 W

Solution
Question 6
4 / -1

Assertion (A) In a series R-L-C circuit the voltages across resistor, inductor and capacitor are 8 V, 16 V and 10 V respectively. The resultant emf in the circuit is 10 V.
Reason (R) Resultant emf of the circuit is given by the relation.

A
If both A and R are correct and R is the correct explanation of A

B
If both A and R are correct but R in not the correct explanation of A

C
If A is correct but R is incorrect

D
If A is. incorrect but R is correct

Solution
Question 7
4 / -1

In a series resonant R-L-C circuit, the voltage across R is 100 V and the value of R =1000Ω.The capacitance of the capacitor is 2 × 10^-6 F; angular frequency of AC is 200 rad s ^-1. Then the potential difference across the inductance coil is

A
100 V

B
40 V

C
250 V

D
400 V

Solution
Question 8
4 / -1

A resistor of R = 6 Ω, an inductor of L =1H and a capacitor of C =17.36µF are connected in series with an AC source. Find the Q -factor.

A
3.72

B
40

C
2.37

D
80

Solution
Question 9
4 / -1

The values of L, C and R for a circuit are 1H, 9F and 3 Ω. What is the quality factor for the circuit at resonance?

A
1

B
9

C

D

Solution
Question 10
4 / -1

A
200

B
100

C
50

D
25

Solution