# Practice Test: Question Set - 04

**1. A 470 Î© resistor and a 0.2 Î¼F capacitor are in parallel across a 2.5 kHz ac source. The admittance, Y, in rectangular form, is**

- (A) 212 Î©

- (B) 2.12 mS
+

*j*3.14 mS

- (C) 3.14 mS
+

*j*2.12 mS

- (D) 318.3 Î©

**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 +

*j*55

- (B) 40 +

*j*40

- (C) 45.88
+

*j*65.52

- (D) 22.94
+

*j*32.76

**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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