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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.
| 201. |
When converting 7,000 nA to microamperes, the result is |
| A. | 0.007 A |
| B. | 0.7 A |
| C. | 700 A |
| D. | 7 A |
| Answer» E. | |
| 202. |
A wiper is the sliding contact in a |
| A. | switch |
| B. | photoconductive cell |
| C. | thermistor |
| D. | potentiometer |
| Answer» E. | |
| 203. |
The first row of a certain determinant has the numbers 3 and 5. The second row has the numbers 7 and 2. The value of this determinant is |
| A. | 31 |
| B. | 31 |
| C. | 39 |
| D. | 29 |
| Answer» E. | |
| 204. |
What is the voltage drop across R2? |
| A. | 3.5 V |
| B. | 4.18 V |
| C. | 1.5 V |
| D. | 145 mV |
| Answer» C. 1.5 V | |
| 205. |
A resistor is connected across a 50 V source. What is the current in the resistor if the color code is red, orange, orange, silver? |
| A. | 2 mA |
| B. | 2.2 mA |
| C. | 214 mA |
| D. | 21.4 mA |
| Answer» C. 214 mA | |
| 206. |
The quantity 3.3 103 is the same as |
| A. | 330 |
| B. | 3,300 |
| C. | 33,000 |
| D. | 0.0033 |
| Answer» C. 33,000 | |
| 207. |
When 12 V are applied across a 68 resistor, the current is |
| A. | 816 mA |
| B. | 17.6 mA |
| C. | 176 mA |
| D. | 8.16 mA |
| Answer» D. 8.16 mA | |
| 208. |
A certain series circuit consists of a 1/8 W resistor, a 1/4 W resistor, and a 1/2 W resistor. The total resistance is 1200 . If each resistor is operating in the circuit at its maximum power dissipation, total current flow is |
| A. | 27 mA |
| B. | 2.7 mA |
| C. | 19 mA |
| D. | 190 mA |
| Answer» B. 2.7 mA | |
| 209. |
If the rms current through a 4.7 k 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 | |
| 210. |
The Thevenin equivalent voltage is |
| A. | equal to the source voltage |
| B. | the same as the load voltage |
| C. | the open circuit voltage |
| D. | none of the above |
| Answer» D. none of the above | |
| 211. |
The voltages in Problem 4 are measured at a certain frequency. To make the capacitor voltage greater than the resistor voltage, the frequency |
| A. | must be increased |
| B. | must be decreased |
| C. | is held constant |
| D. | has no effect |
| Answer» C. is held constant | |
| 212. |
Polyphase generators produce simultaneous multiple sinusoidal voltages that are separated by |
| A. | certain constant phase angles |
| B. | certain constant frequencies |
| C. | certain constant voltages |
| D. | certain constant currents |
| Answer» B. certain constant frequencies | |
| 213. |
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 | |
| 214. |
When the current through an inductor decreases, the amount of energy stored in the electromagnetic field |
| A. | increases |
| B. | decreases |
| C. | remains the same |
| D. | doubles |
| Answer» C. remains the same | |
| 215. |
Referring this circuit, determine the maximum output voltage when a single pulse is applied as shown. The total resistance is 60 . |
| A. | 2.73 V |
| B. | 27.33 V |
| C. | 30 V |
| D. | 2.67 V |
| Answer» C. 30 V | |
| 216. |
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 . | |
| 217. |
An 18 V power supply is connected across a coil with a winding resistance of 180 . Current flow in the coil is |
| A. | 1 mA |
| B. | 10 mA |
| C. | 100 mA |
| D. | 1 A |
| Answer» D. 1 A | |
| 218. |
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 | |
| 219. |
If in a Y-connected ac generator, each phase voltage has a magnitude of 90 VRMS, what is the magnitude of each line voltage? |
| A. | 0 V |
| B. | 90 V |
| C. | 156 V |
| D. | 180 V |
| Answer» D. 180 V | |
| 220. |
In a certain series resonant circuit, VC = 125 V, VL = 125 V, and VR = 40 V. The value of the source voltage is |
| A. | 125 V |
| B. | 250 V |
| C. | 290 V |
| D. | 40 V |
| Answer» E. | |
| 221. |
In applying the superposition theorem, |
| A. | the sources are considered one at a time with all others replaced by their internal impedance |
| B. | all sources are considered independently |
| C. | all sources are considered simultaneously |
| D. | the sources are considered one at a time with all others replaced by their internal resistance |
| Answer» B. all sources are considered independently | |
| 222. |
In order to get maximum power transfer from a capacitive source, the load must |
| A. | have a capacitive reactance equal to circuit resistance |
| B. | have an impedance that is the complex conjugate of the source impedance |
| C. | be as capacitive as it is inductive |
| D. | none of the above |
| Answer» C. be as capacitive as it is inductive | |
| 223. |
A steady-state condition is reached when |
| A. | the output voltage reaches the average value of the input voltage |
| B. | the output voltage reaches the input voltage |
| C. | the output voltage reaches approximately 63% of the input voltage |
| D. | the output voltage reaches the effective value of the input voltage |
| Answer» B. the output voltage reaches the input voltage | |
| 224. |
Referring to the give circuit, the output will |
| A. | decay to zero at the end of the pulse |
| B. | reach 6 V at the end of the pulse |
| C. | reach 3.78 V at the end of the pulse |
| D. | reach 5.16 V at the end of the pulse |
| Answer» B. reach 6 V at the end of the pulse | |
| 225. |
A single 6 V pulse with a width of 600 s is applied to an integrator consisting of a 150 k resistor and a 0.002 F capacitor. To what voltage will the capacitor charge? |
| A. | 0 V |
| B. | 3.78 V |
| C. | 5.16 V |
| D. | 6 V |
| Answer» D. 6 V | |
| 226. |
To understand how the output voltage is shaped by a differentiator, you must consider |
| A. | the response to the rising pulse edge |
| B. | the response between the rising and falling edges |
| C. | the response to the falling pulse edge |
| D. | all of the above |
| Answer» E. | |
| 227. |
In an integrator, when the pulse width of the input is much less than the transient time, the output voltage approaches the shape of the input. |
| A. | True |
| B. | False |
| Answer» C. | |
| 228. |
In an RC differentiating circuit, the output voltage is taken across the resistor. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 229. |
If the capacitor in an integrator opens, the output has the same voltage as the input. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 230. |
The flat portions of a pulse waveform contain low-frequency components. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 231. |
In an RC integrating circuit, the output voltage is taken across the capacitor. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 232. |
In an RL differentiating circuit, the output voltage is taken across the resistor. |
| A. | True |
| B. | False |
| Answer» C. | |
| 233. |
A dc component is the peak value of a pulse waveform. |
| A. | True |
| B. | False |
| Answer» C. | |
| 234. |
A 120 resistor must carry a maximum current of 25 mA. Its rating should be at least |
| A. | 4.8 W |
| B. | 150 mW |
| C. | 15 mW |
| D. | 480 mW |
| Answer» C. 15 mW | |
| 235. |
The rising and falling edges of a pulse waveform contain the higher frequency component. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 236. |
In an electric circuit, the reaction of a circuit to a given pulse input is known as the pulse response. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 237. |
In a -connected generator, all of the phase voltages are |
| A. | zero |
| B. | equal in magnitude |
| C. | one-third of total |
| D. | one-sixth of total |
| Answer» C. one-third of total | |
| 238. |
Materials with lots of free electrons are called |
| A. | conductors |
| B. | insulators |
| C. | semiconductors |
| D. | filters |
| Answer» B. insulators | |
| 239. |
Eight-tenths 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. | |
| 240. |
Three 47 resistors are connected in parallel across a 110 volt source. The current drawn from the source is approximately |
| A. | 2.3 A |
| B. | 780 mA |
| C. | 47 mA |
| D. | 7.06 A |
| Answer» E. | |
| 241. |
If a 24 V and a 6 V battery are series opposing, the total voltage is |
| A. | 30 V |
| B. | 24 V |
| C. | 18 V |
| D. | 0 V |
| Answer» D. 0 V | |
| 242. |
The unit of electrical charge is the |
| A. | volt |
| B. | ampere |
| C. | joule |
| D. | coulomb |
| Answer» E. | |
| 243. |
How much voltage is needed to produce 2.5 A of current through a 200 resistor? |
| A. | 50 V |
| B. | 500 V |
| C. | 80 V |
| D. | 8 V |
| Answer» C. 80 V | |
| 244. |
An ohmmeter is an instrument for measuring |
| A. | current |
| B. | voltage |
| C. | resistance |
| D. | wattage |
| Answer» D. wattage | |
| 245. |
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 | |
| 246. |
Five light bulbs are connected in parallel across 110 V. Each bulb is rated at 200 W. The current through each bulb is approximately |
| A. | 2.2 A |
| B. | 137 mA |
| C. | 1.8 A |
| D. | 9.09 A |
| Answer» D. 9.09 A | |
| 247. |
When a 15 V input pulse with a width equal to two time constants is applied to an RC integrator, the capacitor charges to |
| A. | 15 V |
| B. | 12.9 V |
| C. | 8.6 V |
| D. | 19.45 V |
| Answer» C. 8.6 V | |
| 248. |
An integrator consists of a 3.3 k resistor and a 2 F capacitor. A single 30 V, 6 ms pulse is applied to the input. How much will the capacitor charge? |
| A. | 10.3 V |
| B. | 30 V |
| C. | 12.09 V |
| D. | 17.91 V |
| Answer» E. | |
| 249. |
With an RL integrator, at the instant of the rising pulse edge, |
| A. | all the input voltage is across the resistor |
| B. | all the input voltage is across the inductor |
| C. | 63 percent of the input voltage is across the resistor |
| D. | 63 percent of the input voltage is across the inductor |
| Answer» C. 63 percent of the input voltage is across the resistor | |
| 250. |
When a 12 V input pulse with a width equal to one time constant is applied to an RC integrator, the capacitor charges to |
| A. | 0 V |
| B. | 12 V |
| C. | 6.3 V |
| D. | 7.56 V |
| Answer» E. | |