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MCQOPTIONS
This section includes 553 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 151. |
In a -connected source driving a -connected load, the |
| A. | load voltage and line voltage are one-third the source voltage for a given phase |
| B. | load voltage and line voltage are two-thirds the source voltage for a given phase |
| C. | load voltage and line voltage cancel for a given phase |
| D. | load voltage, line voltage, and source phase voltage are all equal for a given phase |
| Answer» E. | |
| 152. |
In a -connected source feeding a Y-connected load, |
| A. | each phase voltage equals the difference of the corresponding load voltages |
| B. | each phase voltage equals the corresponding load voltage |
| C. | each phase voltage is one-third the corresponding load voltage |
| D. | each phase voltage is 60 out of phase with the corresponding load voltage |
| Answer» B. each phase voltage equals the corresponding load voltage | |
| 153. |
In a certain three-wire Y-connected generator, the phase voltages are 2 kV. The magnitudes of the line voltages are |
| A. | 2,000 V |
| B. | 6,000 V |
| C. | 666 V |
| D. | 3,464 V |
| Answer» E. | |
| 154. |
The two basic components of a Thevenin equivalent ac circuit are |
| A. | the equivalent voltage source and the equivalent series impedance |
| B. | the equivalent voltage source and the equivalent series resistance |
| C. | the equivalent voltage source and the equivalent parallel impedance |
| D. | the equivalent voltage source and the equivalent parallel resistance |
| Answer» B. the equivalent voltage source and the equivalent series resistance | |
| 155. |
In a Y-connected source feeding a -connected load, |
| A. | each phase of the load has one-third of the full line voltage across it |
| B. | each phase of the load has two-thirds of the full line voltage across it |
| C. | each phase of the load has the full line voltage across it |
| D. | each phase of the load has a voltage across it equal to |
| E. | <img src="/_files/images/electrical-engineering/squareofthree.gif"> |
| Answer» D. each phase of the load has a voltage across it equal to | |
| 156. |
A three-phase generator is connected to three 90 load resistors. Each coil generates 120 V ac. A common neutral line exists. How much current flows through the common neutral line? |
| A. | 0 A |
| B. | 1.33 A |
| C. | 3.99 A |
| D. | 2.66 A |
| Answer» B. 1.33 A | |
| 157. |
Compare the total copper cross sections in terms of current-carrying capacity for a single-phase and a three-phase 120 V system with effective load resistance of 15 . |
| A. | single-phase 32 A; three-phase 16 A |
| B. | single-phase 16 A; three-phase 8 A |
| C. | single-phase 8 A; three-phase 4 A |
| D. | single-phase 16 A; three-phase 0 A |
| Answer» C. single-phase 8 A; three-phase 4 A | |
| 158. |
In a Y-Y source/load configuration, the |
| A. | phase current, the line current, and the load current are all equal in each phase |
| B. | phase current, the line current, and the load current are 120 out of phase |
| C. | phase current and the line current are in phase, and both are 120 out of phase with the load current |
| D. | line current and the load current are in phase, and both are out of phase with the phase current |
| Answer» B. phase current, the line current, and the load current are 120 out of phase | |
| 159. |
A constant load power means a uniform conversion of |
| A. | mechanical to electrical energy |
| B. | electrical to mechanical energy |
| C. | current to voltage |
| D. | voltage to current |
| Answer» C. current to voltage | |
| 160. |
In a Y-connected circuit, the magnitude of each line current is |
| A. | one-third the phase current |
| B. | three times the corresponding phase current |
| C. | equal to the corresponding phase current |
| D. | zero |
| Answer» D. zero | |
| 161. |
A two-phase generator is connected to two 90 load resistors. Each coil generates 120 V ac. A common neutral line exists. How much current flows through the common neutral line? |
| A. | 1.33 A |
| B. | 1.88 A |
| C. | 2.66 A |
| D. | 1.77 A |
| Answer» E. | |
| 162. |
A single-phase sinusoidal voltage of 120 V is connected to a 90 load. Current in the circuit is |
| A. | 13.3 mA |
| B. | 133 mA |
| C. | 1.33 A |
| D. | 6.2 A |
| Answer» D. 6.2 A | |
| 163. |
In a Y-connected circuit, between each line voltage and the nearest phase voltage, there is a phase angle of |
| A. | 0 |
| B. | 30 |
| C. | 60 |
| D. | 120 |
| Answer» C. 60 | |
| 164. |
Determine the frequency at which the maximum power is transferred from the amplifier to the speaker in the given figure. |
| A. | 1,027 Hz |
| B. | 10,270 Hz |
| C. | 6,330 Hz |
| D. | 63,330 Hz |
| Answer» B. 10,270 Hz | |
| 165. |
Referring to the given circuit, how much power, in watts, is delivered to the speaker at the determined frequency if VS = 4.5 VRMS? |
| A. | 226 mW |
| B. | 2.26 mW |
| C. | 4.24 mW |
| D. | 424 mW |
| Answer» E. | |
| 166. |
The Norton equivalent current is |
| A. | the current through the load |
| B. | the open-current from the source |
| C. | the short circuit current |
| D. | none of the above |
| Answer» D. none of the above | |
| 167. |
To derive 18 V and 12 V from a 24 V supply requires a voltage divider with three taps. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 168. |
A Wheatstone bridge is often shown in a "diamond" configuration. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 169. |
A galvanometer is a meter that measures small amounts of voltage. |
| A. | True |
| B. | False |
| Answer» C. | |
| 170. |
Using Kirchhoff's voltage law, you can find the voltages across certain parts of a series-parallel circuit. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 171. |
A Wheatstone bridge consists of four resistors in parallel. |
| A. | True |
| B. | False |
| Answer» C. | |
| 172. |
Two equal-value resistors in series will divide the source voltage equally. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 173. |
A resistor ladder network is a special type of series-parallel circuit. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 174. |
A smaller-value load resistor will cause the output voltage to change more than a larger-value one. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 175. |
Using the current-divider formula, you can find the current in any branch of a series-parallel circuit. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 176. |
When converting 0.16 mA to microamperes, the result is |
| A. | 16 A |
| B. | 160 A |
| C. | 1,600 A |
| D. | 0.0016 A |
| Answer» C. 1,600 A | |
| 177. |
Two resistors are in series: a 5.6 k resistor and a 4.7 k resistor. The voltage drop across the 5.6 k resistor is 10 V. The voltage across the 4.7 k resistor is |
| A. | 8.39 V |
| B. | 10 V |
| C. | 2.32 V |
| D. | 0 V |
| Answer» B. 10 V | |
| 178. |
Find the node voltage VA. |
| A. | 518 mV |
| B. | 5.18 V |
| C. | 9.56 V |
| D. | 956 mV |
| Answer» C. 9.56 V | |
| 179. |
Five inductors are connected in series. The lowest value is 8 H. If the value of each inductor is twice that of the preceding one, and if the inductors are connected in order of ascending values, the total inductance is |
| A. | 8 H |
| B. | 32 H |
| C. | 64 H |
| D. | 248 H |
| Answer» E. | |
| 180. |
Norton's theorem gives |
| A. | an equivalent current source in parallel with an equivalent impedance |
| B. | an equivalent current source in series with an equivalent impedance |
| C. | an equivalent voltage source in parallel with an equivalent impedance |
| D. | an equivalent voltage source in series with an equivalent impedance |
| Answer» B. an equivalent current source in series with an equivalent impedance | |
| 181. |
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 | |
| 182. |
Referring to Problem 8, the total current is |
| A. | 1.5 A |
| B. | 573 mA |
| C. | 5.73 A |
| D. | 1.19 A |
| Answer» D. 1.19 A | |
| 183. |
If the value of C in a series RLC circuit is decreased, the resonant frequency |
| A. | is not affected |
| B. | increases |
| C. | is reduced to zero |
| D. | decreases |
| Answer» C. is reduced to zero | |
| 184. |
If two currents are in the same direction at any instant of time in a given branch of a circuit, the net current at that instant |
| A. | is zero |
| B. | is the sum of the two currents |
| C. | is the difference between the two currents |
| D. | cannot be determined |
| Answer» C. is the difference between the two currents | |
| 185. |
In a certain Y-Y system, the source phase currents each have a magnitude of 9 A. The magnitude of each load current for a balanced load condition is |
| A. | 3 A |
| B. | 6 A |
| C. | 9 A |
| D. | 27 A |
| Answer» D. 27 A | |
| 186. |
In a series RLC circuit that is operating above the resonant frequency, the current |
| A. | lags the applied voltage |
| B. | leads the applied voltage |
| C. | is in phase with the applied voltage |
| D. | is zero |
| Answer» B. leads the applied voltage | |
| 187. |
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 | |
| 188. |
Three hundred joules of energy are consumed in 15 s. The power is |
| A. | 2,000 W |
| B. | 2 W |
| C. | 20 W |
| D. | 200 W |
| Answer» D. 200 W | |
| 189. |
When a fourth resistor is connected in series with three resistors, the total resistance |
| A. | increases by one-fourth |
| B. | increases |
| C. | decreases |
| D. | remains the same |
| Answer» C. decreases | |
| 190. |
A material that does not allow current under normal conditions is a(n) |
| A. | insulator |
| B. | conductor |
| C. | semiconductor |
| D. | valence |
| Answer» B. conductor | |
| 191. |
A circuit breaker is a |
| A. | fuse |
| B. | switch |
| C. | resettable protective device |
| D. | resistor |
| Answer» D. resistor | |
| 192. |
A current of 200 A through a 6.8 k resistor produces a voltage drop of |
| A. | 34.4 V |
| B. | 340 V |
| C. | 13.6 V |
| D. | 1.36 V |
| Answer» E. | |
| 193. |
A 6 V battery is connected to a 300 load. Under these conditions, it is rated at 40 Ah. How long can it supply current to the load? |
| A. | 1 h |
| B. | 200 h |
| C. | 2,000 h |
| D. | 10 h |
| Answer» D. 10 h | |
| 194. |
The total resistance of a circuit is 680 . The percentage of the total voltage appearing across a 47 resistor that makes up part of the total series resistance is |
| A. | 68% |
| B. | 47% |
| C. | 69% |
| D. | 6.91% |
| Answer» E. | |
| 195. |
The output of a certain voltage divider is 12 V with no load. When a load is connected, the output voltage |
| A. | decreases |
| B. | increases |
| C. | remains the same |
| D. | becomes zero |
| Answer» B. increases | |
| 196. |
If a 6 V and a 9 V source are connected series aiding, the total voltage is |
| A. | 6 V |
| B. | 9 V |
| C. | 3 V |
| D. | 15 V |
| Answer» E. | |
| 197. |
How many watt-hours represent 65 W used for 18 h? |
| A. | 11.7 Wh |
| B. | 1,170 Wh |
| C. | 11,700 Wh |
| D. | 117,000 Wh |
| Answer» C. 11,700 Wh | |
| 198. |
A 68 resistor is connected across the terminals of a 3 V battery. The power dissipation of the resistor is |
| A. | 132 mW |
| B. | 13.2 mW |
| C. | 22.6 mW |
| D. | 226 mW |
| Answer» B. 13.2 mW | |
| 199. |
The higher the range setting, the less the internal resistance and the greater the load effect of the voltmeter on a circuit. |
| A. | True |
| B. | False |
| Answer» C. | |
| 200. |
A two-terminal variable resistor is known as a |
| A. | potentiometer |
| B. | thermistor |
| C. | rheostat |
| D. | wiper |
| Answer» D. wiper | |