Multiple Choice Questions with Answers on RC Circuits - ObjectiveBooks

# Practice Test: Question Set - 04

1. A 470 Ω resistor and a 0.2 μF capacitor are in parallel across a 2.5 kHz ac source. The admittance, Y, in rectangular form, is
(A) 212 Ω
(B) 2.12 mS + j3.14 mS
(C) 3.14 mS + j2.12 mS
(D) 318.3 Ω

2. 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

3. An imaginary number is one that exists only in the mind of the mathematician.
(A) True
(B) False

4. A positive angle of 30° is equivalent to a negative angle of
(A) -30°
(B) -330°
(C) -60°
(D) -180°

5. The power factor (PF) indicates how much of the apparent power is true power.
(A) True
(B) False

6. Apparent power is expressed in watts.
(A) True
(B) False

7. The complex number 40 ∠ 55° is equivalent to
(A) 55 + j55
(B) 40 + j40
(C) 45.88 + j65.52
(D) 22.94 + j32.76

8. The polar form of a complex number consists of a real part and a j part.
(A) True
(B) False

9. A filter passes all frequencies.
(A) True
(B) False

10. Total current in an RC circuit always leads the source voltage.
(A) True
(B) False

11. 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

12. In a lag network, the output voltage lags the input voltage in phase.
(A) True
(B) False

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