MCQOPTIONS
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MCQOPTIONS
This section includes 217 Mcqs, each offering curated multiple-choice questions to sharpen your Electronics knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
A voltmeter is connected across the current path. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 102. |
An ammeter is connected across the current path. |
| A. | True |
| B. | False |
| Answer» C. | |
| 103. |
When the current is 2.5 A, how many coulombs pass a point in 0.2 s? |
| A. | 12.5 C |
| B. | 1.25 C |
| C. | 0.5 C |
| D. | 5 C |
| Answer» D. 5 C | |
| 104. |
Current flows in a circuit when |
| A. | A switch is opened |
| B. | A switch is closed |
| C. | The switch is either open or closed |
| D. | There is no voltage |
| Answer» C. The switch is either open or closed | |
| 105. |
Eighttenths coulomb passes a point in 4 s. The current in amperes is |
| A. | 1.6 A |
| B. | 16 A |
| C. | 2 A |
| D. | 0.2 A |
| Answer» E. | |
| 106. |
The unit of electrical charge is the |
| A. | Coulomb |
| B. | Joule |
| C. | Volt |
| D. | Watt |
| Answer» B. Joule | |
| 107. |
A 20 kHz pulse waveform consists of pulses that are 15 µs wide. The duty cycle |
| A. | Is 1% |
| B. | Is 30% |
| C. | Is 100% |
| D. | Cannot be determined |
| Answer» C. Is 100% | |
| 108. |
Duty cycle is the characteristic of a pulse waveform that indicates the high time versus the low time. |
| A. | True |
| B. | False |
| Answer» C. | |
| 109. |
How many degrees are there in p/3 rad? |
| A. | 6° |
| B. | 60° |
| C. | 180° |
| D. | 27° |
| Answer» C. 180° | |
| 110. |
The unit of frequency is the hertz. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 111. |
The angular position of a phasor represents the angle of the sine wave with respect to a reference. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 112. |
If the rms voltage drop across a 15 kΩ resistor is 16 V, the peak current through the resistor is |
| A. | 15 mA |
| B. | 1.5 mA |
| C. | 10 mA |
| D. | 1 mA |
| Answer» C. 10 mA | |
| 113. |
The duty cycle of a pulse waveform with a pulse width of 10 µs and a period of 100 µs is 25%. |
| A. | True |
| B. | False |
| Answer» C. | |
| 114. |
One sine wave has a positive-going zero crossing at 15° and another sine wave has a positive-going zero crossing at 55°. The phase angle between the two waveforms is |
| A. | 0° |
| B. | 45° |
| C. | 40° |
| D. | None of the above |
| Answer» D. None of the above | |
| 115. |
The length of a phasor represents the amplitude. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 116. |
A pulse waveform has a high time of 8 ms and a pulse width of 32 ms. The duty cycle is |
| A. | 25% |
| B. | 50% |
| C. | 1% |
| D. | 100% |
| Answer» B. 50% | |
| 117. |
If the rms current through a 4.7 kΩ resistor is 4 mA, the peak voltage drop across the resistor is |
| A. | 4 V |
| B. | 18.8 V |
| C. | 26.6 V |
| D. | 2.66 V |
| Answer» D. 2.66 V | |
| 118. |
If the rms current through a 6.8 kΩ resistor is 8 mA, the rms voltage drop across the resistor is |
| A. | 5.44 V |
| B. | 54.4 V |
| C. | 7.07 V |
| D. | 8 V |
| Answer» C. 7.07 V | |
| 119. |
The average value of a 12 V peak sine wave over one complete cycle is |
| A. | 0 V |
| B. | 1.27 V |
| C. | 7.64 V |
| D. | 6.37 V |
| Answer» B. 1.27 V | |
| 120. |
A saw-tooth wave has a period of 10 ms. Its frequency is |
| A. | 10 Hz |
| B. | 50 Hz |
| C. | 100 Hz |
| D. | 1,000 Hz |
| Answer» D. 1,000 Hz | |
| 121. |
The designation rms means repetitions measured per second. |
| A. | True |
| B. | False |
| Answer» C. | |
| 122. |
Periodic is characterized by a repetition at fixed time intervals. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 123. |
A square wave has a period of 60 µs. The first odd harmonic is |
| A. | 5 kHz |
| B. | 50 kHz |
| C. | 500 kHz |
| D. | 33.33 kHz |
| Answer» C. 500 kHz | |
| 124. |
Average value of a sine wave is 0.707 times the peak value. |
| A. | True |
| B. | False |
| Answer» C. | |
| 125. |
A sine wave with an rms value of 12 V is riding on a dc level of 18 V. The maximum value of the resulting waveform is |
| A. | 6 V |
| B. | 30 V |
| C. | 35 V |
| D. | 0 V |
| Answer» D. 0 V | |
| 126. |
The conductive loop on the rotor of a simple two-pole, single-phase generator rotates at a rate of 400 rps. The frequency of the induced output voltage is |
| A. | 40 Hz |
| B. | 100 Hz |
| C. | 400 Hz |
| D. | Indeterminable |
| Answer» D. Indeterminable | |
| 127. |
If the peak of a sine wave is 13 V, the peak-to-peak value is |
| A. | 6.5 V |
| B. | 13 V |
| C. | 26 V |
| D. | None of the above |
| Answer» D. None of the above | |
| 128. |
A sinusoidal current has an rms value of 14 mA. The peak-to-peak value is |
| A. | 45.12 mA |
| B. | 16 mA |
| C. | 39.6 mA |
| D. | 22.6 mA |
| Answer» D. 22.6 mA | |
| 129. |
A signal with a 400 µs period has a frequency of |
| A. | 250 Hz |
| B. | 2,500 Hz |
| C. | 25,000 Hz |
| D. | 400 Hz |
| Answer» C. 25,000 Hz | |
| 130. |
The instantaneous value is the voltage or current value of a waveform at its peak. |
| A. | True |
| B. | False |
| Answer» C. | |
| 131. |
A sine wave with a period of 4 ms is changing at a faster rate than a sine wave with a period of |
| A. | 0.0045 s |
| B. | 2 ms |
| C. | 1.5 ms |
| D. | 3,000 µs |
| Answer» B. 2 ms | |
| 132. |
A 1 kHz signal has a period of 1 ms. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 133. |
Two series resistors are connected to an ac source. If there are 7.5 V rms across one resistor and 4.2 V rms across the other, the peak source voltage is |
| A. | 16.54 V |
| B. | 1.65 V |
| C. | 10.60 V |
| D. | 5.93 V |
| Answer» B. 1.65 V | |
| 134. |
A waveform has a baseline of 3 V, a duty cycle of 20%, and an amplitude of 8 V. The average voltage value is |
| A. | 4 V |
| B. | 4.6 V |
| C. | 1.6 V |
| D. | 11 V |
| Answer» B. 4.6 V | |
| 135. |
A phasor represents |
| A. | The magnitude and a quantity direction |
| B. | The width of a quantity |
| C. | The phase angle |
| D. | The magnitude of a quantity |
| Answer» B. The width of a quantity | |
| 136. |
If a sine wave goes through 10 cycles in 20 µs, the period is |
| A. | 20 µs |
| B. | 4 µs |
| C. | 2 µs |
| D. | 100 µs |
| Answer» D. 100 µs | |
| 137. |
When a sine wave has a frequency of 100 Hz in 12 s it goes through |
| A. | 1/100 cycle |
| B. | 12 cycles |
| C. | 120 cycles |
| D. | 1,200 cycles |
| Answer» E. | |
| 138. |
A sine wave of 15 kHz is changing at a faster rate than a sine wave with a frequency of |
| A. | 25 kHz |
| B. | 12 kHz |
| C. | 18 kHz |
| D. | 1.3 MHz |
| Answer» C. 18 kHz | |
| 139. |
The average half-cycle value of a sine wave with a 40 V peak is |
| A. | 25.48 V |
| B. | 6.37 V |
| C. | 14.14 V |
| D. | 50.96 V |
| Answer» B. 6.37 V | |
| 140. |
Amplitude is the maximum value of a voltage or current. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 141. |
A ramp is the type of waveform characterized by a non-linear increase or decrease in voltage or current. |
| A. | True |
| B. | False |
| Answer» C. | |
| 142. |
Sine wave A has a positive-going zero crossing at 45°. Sine wave B has a positive-going zero crossing at 60°. Which of the following statements is true? |
| A. | Wave A leads wave B by 15° |
| B. | Wave A lags wave B by 15° |
| C. | Wave A leads wave B by 105° |
| D. | Wave A lags wave B by 105° |
| Answer» B. Wave A lags wave B by 15° | |
| 143. |
To produce an 800 Hz sine wave, a four-pole generator must be operated at |
| A. | 200 rps |
| B. | 400 rps |
| C. | 800 rps |
| D. | 1,600 rps |
| Answer» C. 800 rps | |
| 144. |
An atom of a semiconductor has _______________ electrons in the valence shell. |
| A. | 4 |
| B. | 8 |
| C. | 2 |
| D. | 0 |
| Answer» B. 8 | |
| 145. |
The ___ represents a negative charge in an atom. |
| A. | electron |
| B. | proton |
| C. | neutron |
| D. | None of the above |
| Answer» B. proton | |
| 146. |
The symbol that represents electrical charge is Q. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 147. |
A ___ resistor has color bands of yellow, violet, yellow, gold. |
| A. | 470 5% |
| B. | 5.7 M 5% |
| C. | 37 k 5% |
| D. | 470 k 5% |
| Answer» E. | |
| 148. |
Switches are used to open and close paths for current. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 149. |
The ___ is placed in series with the flow of current. |
| A. | voltmeter |
| B. | ammeter |
| C. | ohmmeter |
| D. | wattmeter |
| Answer» C. ohmmeter | |
| 150. |
A resistor color coded with brown, black, and orange bands has a value of 10 k. |
| A. | 1 |
| B. | |
| Answer» B. | |