## Objective Questions | Electronics Engineering Quiz

1 >>Capacitor value markings are usually: ?

• (A) alphanumeric
• (B) color dabs
• (C) standard
• (D) white print

2 >>Power stored from the source and then returned to the source is called: ?

• (A) apparent power
• (B) impedance power
• (C) reactive power
• (D) True power

3 >>What is the dielectric constant for ceramic? ?

• (A) between 6 and 8000
• (B) 5
• (C) between 5 and 1000
• (D) 3000

4 >>What is the voltage across a capacitor after being charged from a 100 V source for a period of one time constant? ?

• (A) 37.8 V
• (B) 38 V
• (C) 63 V
• (D) 101 V

5 >>If the dielectric constant of a capacitor is decreased, then its capacitance will: ?

• (A) increase
• (B) decrease
• (C) remain the same
• (D) be destroyed

6 >>What is the value of a capacitor labeled 102? ?

• (A) 10,000 pF
• (B) 100 pF
• (C) 1000 pF
• (D) 10,000  μF

7 >>What is the capacitive reactance if I = 1 amp, V = 2 volts, C = 5 F, and frequency = 10 Hz? ?

• (A) 0.2 Ω
• (B) 0.5 Ω
• (C) 0.02 Ω
• (D) 0.003 Ω

8 >>What is wrong with a leaky capacitor? ?

• (A) It is open
• (B) It is shorted.
• (C) The dielectric resistance has increase
• (D) The dielectric resistance has decreased.

9 >>In a purely capacitive circuit, ?

• (A) current leads voltage by 90°
• (B) voltage leads current by 90°
• (C) current lags voltage by 90°
• (D) current and voltage have a phase relationship of 0°

10 >>What is the reactance value for a capacitor installed in a dc circuit? ?

• (A) zero
• (B) moderate
• (C) infinite
• (D) cannot tell

11 >>What is the impedance of a series RC circuit that consists of a 0.22 μ F capacitor and a 200-ohm resistor connected to a 3 kHz source? ?

• (A) 214 ohms
• (B) 313 ohms
• (C) 414 ohms
• (D) 880 ohms

12 >>If C1, a 4.7 μ F capacitor, and C2, a 3.3 μ F capacitor are in series with 18 Vdc applied, what is the voltage across C1? ?

• (A) 3.3 V
• (B) 7.4 V
• (C) 6.6 V
• (D) 9.4 V

13 >>Which of the following determines the capacitance of a capacitor? ?

• (A) Plate area, dielectric strength, and plate separation
• (B) Voltage rating, dielectric constant, and temperature coefficient
• (C) Temperature coefficient, plate area, and plate separation
• (D) Plate area, dielectric constant, and plate separation

14 >>Most older types of paper capacitors have been replaced by which type of construction? ?

• (A) electrolytic
• (B) plastic film
• (C) oxide casing
• (D) waxed paper

15 >>A capacitor is constructed of two parallel: ?

• (A) conductors
• (B) semiconductors
• (C) inductors
• (D) dielectrics

16 >>Which of the following statements is True? ?

• (A) The voltage to which a capacitor is charged can change instantaneously.
• (B) The current in a capacitive circuit takes time to change.
• (C) A fully charged capacitor appears as a short to dc current.
• (D) An uncharged capacitor appears as a short to an instantaneous change in current.

17 >>What is the total opposition to current in a series RC circuit called? ?

• (A) impedance
• (B) inductance
• (C) reactance
• (D) resistance

18 >>If a current of 40 mA flows through a series circuit consisting of a 0.4μ F capacitor and a resistor in series with a 4 kHz, 40 Vac source, what is the total circuit impedance? ?

• (A) 10 Ω
• (B) 100 Ω
• (C) 1 k Ω
• (D) 1 M Ω

19 >>In an ac circuit, an output capacitor and a resistor are connected in series with an ac signal. What filter action will be the result? ?

• (A) bandpass
• (B) low-pass
• (C) high-pass
• (D) band-stop

20 >>After a capacitor has charged for 1 tc, what percentage of current remains in the resistor? ?

• (A) 63.2
• (B) 36.8
• (C) 13.5
• (D) 5