MCQOPTIONS
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MCQOPTIONS
This section includes 177 Mcqs, each offering curated multiple-choice questions to sharpen your Electronics knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
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 |
| Answer» D. true power | |
| 102. |
What is the dc charging/discharging time constant for the circuit? |
| A. | 294 ps |
| B. | 13.5 ms |
| C. | 21.25 ms |
| D. | 2.16 Gs |
| Answer» D. 2.16 Gs | |
| 103. |
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 |
| Answer» E. | |
| 104. |
After which time constant can a capacitor be considered to be fully charged? |
| A. | first |
| B. | third |
| C. | fifth |
| D. | seventh |
| Answer» D. seventh | |
| 105. |
What is the total current for a 5 MHz, 1 Vac circuit that consists of a 27 pF capacitor and a 1 k resistor connected in parallel? |
| A. | 459 A |
| B. | 647 A |
| C. | 1.31 mA |
| D. | 1.85 mA |
| Answer» D. 1.85 mA | |
| 106. |
As a capacitor is being charged, current flowing into the capacitor will: |
| A. | increase |
| B. | decrease |
| C. | remain the same |
| D. | cannot tell |
| Answer» C. remain the same | |
| 107. |
In an RC circuit, true power (PR) equals: |
| A. | |
| B. | VS √ó I |
| C. | I2R |
| Answer» D. | |
| 108. |
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 |
| Answer» C. 13.5 | |
| 109. |
A 10 F capacitor will have more capacitive reactance than a 20 F capacitor in a 60 Hz circuit. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 110. |
You could increase the time constant of an RC circuit by |
| A. | adding a resistor in parallel with the circuit resistance |
| B. | adding a capacitor in parallel with the circuit capacitance |
| C. | increasing the amplitude of the input voltage |
| D. | exchanging the position of the resistor and capacitor in the circuit |
| Answer» C. increasing the amplitude of the input voltage | |
| 111. |
In the given circuit, the voltage across the capacitor 1 ms after the switch is closed is 11.61 V. |
| A. | 1 |
| B. | |
| C. | 1 |
| D. | |
| Answer» C. 1 | |
| 112. |
The total capacitance in the given circuit is larger than the value of C4. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 113. |
When a circuit consists of a capacitor and a resistor in series with a voltage source, and the voltage across the resistor is zero, then the capacitor is: |
| A. | charging |
| B. | discharging |
| C. | fully charged |
| D. | fully discharged |
| Answer» D. fully discharged | |
| 114. |
The quantity that represents an ideal capacitor dissipating 0 W of power is |
| A. | instantaneous power |
| B. | true power |
| C. | reactive power |
| D. | resistive power |
| Answer» C. reactive power | |
| 115. |
A resistor and an output capacitor form a series circuit with a square wave applied. The circuit is: |
| A. | an integrator |
| B. | a differentiator |
| C. | a multiplier |
| D. | a divider |
| Answer» B. a differentiator | |
| 116. |
What is the value of a capacitor that can store two coulombs of charge when 500 volts is applied across its plates? |
| A. | 4 F |
| B. | 250 F |
| C. | 4,000 F |
| D. | 250 F |
| Answer» D. 250 F | |
| 117. |
What is the value of a capacitor labeled 102? |
| A. | 10,000 pF |
| B. | 1000 pF |
| C. | 1000 F |
| D. | 10,000 F |
| Answer» C. 1000 F | |
| 118. |
What do variable capacitors use for dielectric? |
| A. | ceramic, electrolytic, mica, or paper |
| B. | air, ceramic, mica, or plastic |
| C. | ceramic, paper, plastic, or mica |
| D. | mica, ceramic, plastic, or electrolytic |
| Answer» C. ceramic, paper, plastic, or mica | |
| 119. |
What is the circuit's total current? |
| A. | 4.57 mA |
| B. | 9.327 mA |
| C. | 11.570 mA |
| D. | 13.830 mA |
| Answer» B. 9.327 mA | |
| 120. |
A capacitor has 25 V across its plates and a stored charge of 1500 C. What is the capacitance value? |
| A. | 60 pF |
| B. | 60 F |
| C. | 16.67 mF |
| D. | 37.5 mF |
| Answer» C. 16.67 mF | |
| 121. |
An 8 V power source is charging a capacitor. How many volts will be across the capacitor at the second time constant? |
| A. | 1 volt |
| B. | 3 volts |
| C. | 5 volts |
| D. | 7 volts |
| Answer» E. | |
| 122. |
Capacitor value markings are usually: |
| A. | alphanumeric |
| B. | color dabs |
| C. | standard |
| D. | white print |
| Answer» B. color dabs | |
| 123. |
What is the impedance of an ac RC parallel circuit if the resistance is 12 ohms and the capacitive reactance equals 5 ohms? |
| A. | 0.2 ohms |
| B. | 3.5 ohms |
| C. | 4.6 ohms |
| D. | 13 ohms |
| Answer» D. 13 ohms | |
| 124. |
A capacitor stores energy within a dielectric between the conducting plates in the form of: |
| A. | a magnetic field |
| B. | positive voltage |
| C. | negative voltage |
| D. | an electric field |
| Answer» E. | |
| 125. |
What is the reactance value for a capacitor installed in a dc circuit? |
| A. | zero |
| B. | moderate |
| C. | infinite |
| D. | cannot tell |
| Answer» D. cannot tell | |
| 126. |
A practical capacitor |
| A. | is a short to dc |
| B. | looks like a capacitor in parallel with a resistor |
| C. | is an open to ac |
| D. | stores energy in a magnetic field |
| Answer» C. is an open to ac | |
| 127. |
What is the total opposition to current in a series RC circuit called? |
| A. | impedance |
| B. | inductance |
| C. | reactance |
| D. | resistance |
| Answer» B. inductance | |
| 128. |
What is the capacitance of the circuit shown in the given circuit? |
| A. | 0.066 F |
| B. | 0.9 F |
| C. | 65.97 pF |
| D. | 900 pF |
| Answer» B. 0.9 F | |
| 129. |
What is the impedance of this circuit? |
| A. | 5928 |
| B. | 2000 |
| C. | 1902 |
| D. | 1798 |
| Answer» B. 2000 | |
| 130. |
Ceramic capacitors have higher voltage ratings than electrolytic capacitors. |
| A. | 1 |
| B. | |
| C. | 1 |
| D. | |
| Answer» B. | |
| 131. |
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° |
| Answer» B. voltage leads current by 90¬∞ | |
| 132. |
A capacitor can be fully charged in 4 time constants. |
| A. | 1 |
| B. | |
| C. | 1 |
| D. | |
| Answer» C. 1 | |
| 133. |
For a given charge difference, electrostatic field strength varies according to: |
| A. | plate differential |
| B. | plate area |
| C. | plate distance |
| D. | dielectric quantity |
| Answer» C. plate distance | |
| 134. |
What is the total capacitance? |
| A. | 1 F |
| B. | 12 F |
| C. | 0.615 F |
| D. | 8 F |
| Answer» C. 0.615 F | |
| 135. |
What is the reactive power? |
| A. | 6.8 mW |
| B. | 9.8 mW |
| C. | 12.8 mW |
| D. | 15.8 mW |
| Answer» C. 12.8 mW | |
| 136. |
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 |
| Answer» C. oxide casing | |
| 137. |
What is the power factor if the apparent power of a circuit is 5 W, while the true power is 4 W? |
| A. | 0.0 W |
| B. | 0.8 W |
| C. | 1.0 W |
| D. | 1.25 W |
| Answer» C. 1.0 W | |
| 138. |
A capacitor is constructed of two parallel: |
| A. | conductors |
| B. | semiconductors |
| C. | inductors |
| D. | dielectrics |
| Answer» B. semiconductors | |
| 139. |
What circuit has the following frequency response? |
| A. | bandpass filter |
| B. | high-pass filter |
| C. | low-pass filter |
| D. | integrator |
| Answer» D. integrator | |
| 140. |
The material used between the plates of a capacitor is called its: |
| A. | insulation material |
| B. | dielectric material |
| C. | separation material |
| D. | plate-divider material |
| Answer» C. separation material | |
| 141. |
If a capacitor is placed across a 20 V source, what will be the amount of charge after 5 tc? |
| A. | 5.0 V |
| B. | 12.8 V |
| C. | 13.5 V |
| D. | 20 V |
| Answer» E. | |
| 142. |
What is wrong with a leaky capacitor? |
| A. | It is open. |
| B. | It is shorted. |
| C. | The dielectric resistance has increased. |
| D. | The dielectric resistance has decreased. |
| Answer» E. | |
| 143. |
Capacitive reactance values connected in series offer |
| A. | an increase in total XC |
| B. | a decrease in total XC |
| C. | no change in total XC |
| D. | total opposition to voltage in the circuit |
| Answer» B. a decrease in total XC | |
| 144. |
What is the voltage across the capacitor? |
| A. | 7.07 V |
| B. | 1.11 V |
| C. | 111 mV |
| D. | 7.07 mV |
| Answer» D. 7.07 mV | |
| 145. |
___ capacitors have the highest values of capacitance. |
| A. | Electrolytic |
| B. | Ceramic |
| C. | Plastic-film |
| D. | Mica |
| Answer» B. Ceramic | |
| 146. |
How long would it take the capacitor in the given circuit to completely discharge if the switch was in position 2? |
| A. | 22 ms |
| B. | 69 ms |
| C. | 345 ms |
| D. | 420 ms |
| Answer» E. | |
| 147. |
A circuit whose output voltage is proportional to the rate of change of the input voltage is called a(n) ______ . |
| A. | differentiator |
| B. | integrator |
| C. | curve averager |
| D. | mixer |
| Answer» B. integrator | |
| 148. |
A capacitor stores electric energy in the form of an electric field. |
| A. | 1 |
| B. | |
| C. | 1 |
| D. | |
| Answer» B. | |
| 149. |
To find the total capacitance of capacitors in parallel, sum the values of the individual capacitors. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 150. |
In an ac circuit, a capacitor and an output 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 |
| Answer» D. band-stop | |