A 12 kHz voltage is applied to a 0.33 µF capacitor, and 200 mA of rms current is measured. What is the value of the voltage?

In a series RC circuit, 12 V(rms) is measured across the resistor and 15 V(rms) is measured across the capacitor. The rms source voltage is

A

3 V

B

27 V

C

19.2 V

D

1.9 V

In a clapp oscillator with three capacitor C1, C2, C3, C1 is used as upper capacitor in voltage divider, C2 is used as lower capacitor in voltage divider and C3 is the third capacitor. For perfect operation which of these capacitor should have minimum value?

A

C1

B

C2

C

C3

D

All of them are equal

A transformer has a primary voltage of 120 V rms and a secondary voltage of 25 V rms. If the secondary current is 1A rms, what is the primary current?

A

7.8 mA

B

208 mA

C

200 mA

D

300 mA

E

None of the above

A three-winding transformer is connected to an AC source with 50 V rms as shown in the following figure. Voltages induced in the secondary windings are 2 V rms and 8 V rms. The output rms voltage V0 is,

A

-6 V

B

10 V

C

-10 V

D

6 V

A signal containing only two frequency components (3 kHz and 6 kHz) is sampled at the rate of 8 kHz, and then passed through a low pass filter with a cut-off frequency of 8 kHz. The filter output

A

Is an undistorted version of the original signal

B

Contains only the 3 kHz component

C

Contains the 3 kHz component and a spurious component of 2 kHz

D

Contains both the components of the original signal and two spurious components of 2 kHz and 5 kHz

Find the rms current in a capacitor of 0.1 μF, when an AC voltage of 5 V and frequency of 5 kHz is applied to it.

A

1.57 mA

B

15.71 mA

C

12.57 mA

D

25.32 mA

In a clapp oscillator with three capacitor C1, C2, C3, C1 is used as upper capacitor in voltage divider, C2 is used as lower capacitor in voltage divider and C3 is the third capacitor. For perfect operation of clapp oscillator value of C3 should be __________

A

Equal to C1

B

Equal to C2

C

Equal to C1 parallel C2

D

Very small

In a series RL circuit, 12 V rms is measured across the resistor and 14 V rms is measured across the inductor. The peak value of the source voltage is

A

18.4 V

B

26.0 V

C

2 V

D

20 V

A cosine wave voltage signal has a 10V RMS value and 60Hz frequency. Also at time, t=0, the value of the voltage signal is equal to its RMS value. Which of the following is the correct mathematical representation of the voltage signal?

A

10 cos(60t)

B

10 cos (120πt)

C

14.14 cos(60t + π/4)

D

14.14 cos(120πt + π/4)

In a parallel RL circuit, there are 3 A rms in the resistive branch and 3 A rms in the inductive branch. The total rms current is

A

6 A

B

424 mA

C

4.24 A

D

42.4 A

A 12 kHz voltage is applied to a 0.33 µF capacitor, and 200 mA of rms current is measured. What is the value of the voltage?

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