Electrical Engineering

6 followers study24x7

27 Jan 2025 12:23 PM study24x7

A 47 Ω resistor and a capacitor with 150 Ω of capacitive reactance are in series across an ac source. The impedance, expressed in rectangular form, is

A

Z = 47 Ω + j150 Ω

B

Z = 47 Ω – j150 Ω

C

Z = 197 Ω

D

Z = 103 Ω

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Electrical Engineering

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27 Jan 2025 12:21 PM study24x7

A 120 Ω resistor is in parallel with a capacitor with a capacitive reactance of 40 Ω. Both components are across a 12 V ac source. What is the magnitude of the total impedance?

A

37.9 Ω

B

3.7 Ω

C

14,400 Ω

D

4,800 Ω

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Electrical Engineering

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27 Jan 2025 12:18 PM study24x7

The complex number 40∠55° is equivalent to

A

55 + j55

B

40 + j40

C

45.88 + j65.52

D

22.94 + j32.76

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Electrical Engineering

6 followers study24x7

24 Jan 2025 11:53 AM study24x7

A 12 k Ω resistor is in series with a 0.02 µ F capacitor across a 1.2 kHz ac source. If the current is expressed in polar form as I = 0.3∠0° mA, what is the source voltage expressed in polar form?

A

45.6 V

B

411.3 V

C

0.411 V

D

4.11 V

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Electrical Engineering

6 followers study24x7

24 Jan 2025 11:51 AM study24x7

A 2 k Ω resistor is in series with a 0.015 µF capacitor across a 15 kHz ac source. What is the magnitude of the total impedance and the phase angle?

A

73.4 Ω and θ = –19.5°

B

707 Ω and θ = –19.5°

C

2121 Ω and θ = –19.5°

D

734 Ω and θ = –38.9°

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Electrical Engineering

6 followers study24x7

24 Jan 2025 11:49 AM study24x7

In a series RC circuit, when the frequency and the resistance are halved, the impedance

A

doubles

B

is halved

C

is reduced to one-fourth

D

cannot be determined without values

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Electrical Engineering

6 followers study24x7

23 Jan 2025 10:46 AM study24x7

When the frequency of the voltage applied to a series RC circuit is increased, the phase angle

A

increases

B

decreases

C

remains the same

D

becomes erratic

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Electrical Engineering

6 followers study24x7

23 Jan 2025 10:44 AM study24x7

For a certain load, the true power is 150 W and the reactive power is 125 VAR. The apparent power is

A

19.52 W

B

195.2 W

C

275 W

D

25 W

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Electrical Engineering

6 followers study24x7

23 Jan 2025 10:43 AM study24x7

A resistor and a capacitor are in series across a 20 V ac source. Circuit impedance is 4.33 k Ω. Current flow in the circuit is

A

9.2 mA

B

92 mA

C

4.6 mA

D

460 mA

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Electrical Engineering

6 followers study24x7

22 Jan 2025 11:17 AM study24x7

What is the angular difference between +j4 and –j4?

A

30°

B

90°

C

180°

D

270°

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Electrical Engineering

6 followers study24x7

22 Jan 2025 11:17 AM study24x7

An ac circuit consists of a resistor and a capacitor. To increase the phase angle above 45°, the following condition must exist:

A

R = XC

B

R > XC

C

R < XC

D

R = 5XC

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Electrical Engineering

6 followers study24x7

22 Jan 2025 11:16 AM study24x7

In a parallel RC circuit, there is 100 mA through the resistive branch and 100 mA through the capacitive branch. The total rms current is

A

200 mA

B

100 mA

C

282 mA

D

141 mA

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Electrical Engineering

6 followers study24x7

21 Jan 2025 10:47 AM study24x7

The complex number 6 + j6 is equivalent to

A

6∠45°

B

36∠45°

C

8.48∠45°

D

8.48∠90°

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Electrical Engineering

6 followers study24x7

21 Jan 2025 10:41 AM study24x7

What is the value of the hypotenuse of a right triangle whose sides are 12 and 18?

A

4.24

B

3.46

C

2.16

D

21.63

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Electrical Engineering

6 followers study24x7

21 Jan 2025 10:39 AM study24x7

A 47 Ω resistor and a capacitor with a capacitive reactance of 120 Ω are in series across an ac source. What is the circuit impedance, Z?

A

129 Ω

B

12.9 Ω

C

167 Ω

D

73 Ω

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Electrical Engineering

6 followers study24x7

20 Jan 2025 11:42 AM study24x7

When the frequency of the source voltage decreases, the impedance of a parallel RC circuit

A

increases

B

decreases

C

does not change

D

decreases to zero

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Electrical Engineering

6 followers study24x7

20 Jan 2025 11:41 AM study24x7

In the complex plane, the number 4 + j3 is located in the

A

first quadrant

B

second quadrant

C

third quadrant

D

fourth quadrant

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Electrical Engineering

6 followers study24x7

20 Jan 2025 11:41 AM study24x7

The voltages in Problem 4 are measured at a certain frequency. To make the capacitor voltage greater than the resistor voltage, the frequency

A

must be increased

B

must be decreased

C

is held constant

D

has no effect

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Electrical Engineering

6 followers study24x7

17 Jan 2025 12:16 PM study24x7

A 6 kHz sinusoidal voltage is applied to a series RC circuit. The frequency of the voltage across the resistor is

A

0 Hz

B

12 kHz

C

6 kHz

D

18 kHz

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Electrical Engineering

6 followers study24x7

17 Jan 2025 12:16 PM study24x7

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

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