MCQOPTIONS
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MCQOPTIONS
This section includes 1475 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 301. |
Refer to this portion of a specification sheet. Determine the values of reverse-gate-source voltage and gate current if the FET was forced to accept it. |
| A. | 25 Vdc, 200 nAdc |
| B. | 25 Vdc, 10 mAdc |
| C. | 6 Vdc, 1.0 nAdc |
| D. | None of the above |
| Answer» C. 6 Vdc, 1.0 nAdc | |
| 302. |
The dc load line and ac load line both have the same ________ . |
| A. | x-intercept |
| B. | y-intercept |
| C. | slope |
| D. | Q-point |
| Answer» E. | |
| 303. |
________ has high input impedance, fast switching speeds, and lower operating power levels. |
| A. | CMOS |
| B. | FET |
| C. | BJT |
| D. | None of the above |
| Answer» B. FET | |
| 304. |
The steeper the slope of the ID versus VGS curve, the ________ the level of gm. |
| A. | less |
| B. | same |
| C. | greater |
| Answer» D. | |
| 305. |
The E-MOSFET is quite popular in ________ applications. |
| A. | digital circuitry |
| B. | high-frequency |
| C. | buffering |
| D. | All of the above |
| Answer» E. | |
| 306. |
The Miller effect is meaningful in the ________ amplifier. |
| A. | inverting |
| B. | noninverting |
| C. | inverting/noninverting |
| D. | None of the above |
| Answer» B. noninverting | |
| 307. |
What is the ratio of the peak ripple voltage level to its rms voltage level? |
| A. | <img src="/_files/images/electronic-devices-and-circuit-theory/mca15_0130a.gif"> |
| B. | <img src="/_files/images/electronic-devices-and-circuit-theory/mca15_0130b.gif"> |
| C. | <img src="/_files/images/electronic-devices-and-circuit-theory/mca15_0130c.gif"> |
| D. | <img src="/_files/images/electronic-devices-and-circuit-theory/mca15_0130d.gif"> |
| Answer» B. <img src="/_files/images/electronic-devices-and-circuit-theory/mca15_0130b.gif"> | |
| 308. |
Which component(s) set(s) the voltage across the load in a basic transistor shunt regulator? |
| A. | Zener diode |
| B. | Transistor base-emitter voltage |
| C. | Both the Zener diode and the transistor base-emitter voltage |
| D. | None of the above |
| Answer» D. None of the above | |
| 309. |
Voltage regulation requires |
| A. | only line regulation. |
| B. | only load regulation. |
| C. | a constant load. |
| D. | load and line regulation. |
| Answer» E. | |
| 310. |
Across which of the following components of a power supply does the average (dc) voltage exist? |
| A. | Diodes |
| B. | Secondary of the transformer |
| C. | Capacitor filter |
| D. | None of the above |
| Answer» D. None of the above | |
| 311. |
Switching regulators are more efficient than linear regulators and are particularly useful in ________-voltage, ________-current applications. |
| A. | high, high |
| B. | low, high |
| C. | high, low |
| Answer» C. high, low | |
| 312. |
How many diodes conduct in the full-wave bridge rectifier while the capacitor is being charged? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 313. |
Calculate the ripple of a capacitor filter for a peak rectified voltage of 40 V, a capacitor value C = 75 |
| A. | 3.2% |
| B. | 3.59% |
| C. | 4.03% |
| D. | 4.59% |
| Answer» B. 3.59% | |
| 314. |
How many terminals does a 7800 series IC regulator have? |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | none of the above |
| Answer» C. 4 | |
| 315. |
What are the typical values of Vref and Iadj for the LM317 adjustable voltage regulator? |
| A. | 1.0 V, 100 mA |
| B. | 1.5 V, 100 mA |
| C. | 1.25 V, 100 A |
| D. | 1.25 V, 10 mA |
| Answer» D. 1.25 V, 10 mA | |
| 316. |
Calculate the dc voltage across a 2-k |
| A. | 40.78 V |
| B. | 42.78 V |
| C. | 45.78 V |
| D. | 48.78 V |
| Answer» E. | |
| 317. |
In which period is the capacitor filter charged in a full-wave rectifier? |
| A. | The time during the positive cycle |
| B. | The time during which the diodes are not conducting |
| C. | The time during which the diode(s) is (are) conducting |
| D. | The time during the negative cycle |
| Answer» D. The time during the negative cycle | |
| 318. |
The ________ regulator is less efficient than the ________ type, but offers inherent short-circuit protection. |
| A. | series, shunt |
| B. | shunt, series |
| Answer» C. | |
| 319. |
A tunnel diode is used |
| A. | in high-power circuits. |
| B. | in circuits requiring negative resistance. |
| C. | in very fast-switching circuits. |
| D. | in power supply rectifiers. |
| Answer» C. in very fast-switching circuits. | |
| 320. |
What type of diode is commonly used in electronic tuners in TVs? |
| A. | varactor |
| B. | Schottky |
| C. | LED |
| D. | Gunn |
| Answer» B. Schottky | |
| 321. |
A laser diode normally emits |
| A. | coherent light. |
| B. | monochromatic light. |
| C. | coherent and monochromatic light. |
| D. | neither coherent nor monochromatic light. |
| Answer» D. neither coherent nor monochromatic light. | |
| 322. |
A varactor is a pn junction diode that always operates in ________-bias and is doped to ________ the inherent capacitance of the depletion region. |
| A. | forward, maximize |
| B. | reverse, maximize |
| C. | reverse, minimize |
| D. | forward, minimize |
| Answer» C. reverse, minimize | |
| 323. |
What diode is used in seven-segment displays? |
| A. | zener |
| B. | LED |
| C. | laser |
| D. | Schottky |
| Answer» C. laser | |
| 324. |
Refer to this figure. If VIN decreases, IR will |
| A. | increase. |
| B. | decrease. |
| C. | remain the same. |
| Answer» C. remain the same. | |
| 325. |
Zener diodes with breakdown voltages greater than 5 V operate predominantly in what type of breakdown? |
| A. | avalanche |
| B. | zener |
| C. | varactor |
| D. | Schottky |
| Answer» B. zener | |
| 326. |
The process of emitting photons from a semiconductive material is called |
| A. | photoluminescence. |
| B. | gallium arsenide. |
| C. | electroluminescence. |
| D. | gallium phosphide. |
| Answer» D. gallium phosphide. | |
| 327. |
An 8.2 V zener has a resistance of 5 |
| A. | 8.2 V. |
| B. | 125 mV. |
| C. | 8.325 V. |
| D. | 8.075 V. |
| Answer» D. 8.075 V. | |
| 328. |
What diode operates only with majority carriers? |
| A. | laser |
| B. | tunnel |
| C. | Schottky |
| D. | step-recovery |
| Answer» D. step-recovery | |
| 329. |
Refer to this figure. If VIN attempts to increase, VR will |
| A. | increase. |
| B. | decrease. |
| C. | remain the same. |
| Answer» B. decrease. | |
| 330. |
An LED is forward-biased. The diode should be on, but no light is showing. A possible trouble might be |
| A. | the diode is open. |
| B. | the series resistor is too small. |
| C. | none. The diode should be off if forward-biased. |
| D. | the power supply voltage is too high. |
| Answer» B. the series resistor is too small. | |
| 331. |
A 6.2 V zener is rated at 1 watt. The maximum safe current the zener can carry is |
| A. | 1.61 A. |
| B. | 161 mA. |
| C. | 16.1 mA. |
| D. | 1.61 mA. |
| Answer» C. 16.1 mA. | |
| 332. |
Refer to this figure. If VIN increases, IZ will |
| A. | increase. |
| B. | decrease. |
| C. | remain the same. |
| Answer» B. decrease. | |
| 333. |
What kind of diode is formed by joining a doped semiconductor region with a metal? |
| A. | laser |
| B. | tunnel |
| C. | pin |
| D. | Schottky |
| Answer» E. | |
| 334. |
Which diode employs graded doping? |
| A. | zener |
| B. | LED |
| C. | tunnel |
| D. | step-recovery |
| Answer» E. | |
| 335. |
Refer to this figure. Identify the Schottky diode. |
| A. | a |
| B. | b |
| C. | c |
| D. | d |
| E. | e |
| Answer» F. | |
| 336. |
Which transistor bias circuit arrangement provides good Q-point stability, but requires both positive and negative supply voltages? |
| A. | base bias |
| B. | collector-feedback bias |
| C. | voltage-divider bias |
| D. | emitter bias |
| Answer» E. | |
| 337. |
The linear (active) operating region of a transistor lies along the load line below ________ and above ________. |
| A. | cutoff, saturation |
| B. | saturation, cutoff |
| Answer» C. | |
| 338. |
Refer to this figure. Assume that IC |
| A. | 5 V |
| B. | 10 V |
| C. | 15 V |
| D. | 2.5 V |
| Answer» E. | |
| 339. |
Refer to this figure. In the voltage-divider biased npn transistor circuit, if RC opens, the transistor is |
| A. | saturated. |
| B. | cutoff. |
| C. | nonconducting. |
| Answer» D. | |
| 340. |
The most stable biasing technique used is the |
| A. | voltage-divider bias. |
| B. | base bias. |
| C. | emitter bias. |
| D. | collector bias. |
| Answer» B. base bias. | |
| 341. |
Voltage-divider bias has a relatively stable Q-point, as does |
| A. | base bias. |
| B. | collector-feedback bias. |
| C. | both of the above |
| D. | none of the above |
| Answer» C. both of the above | |
| 342. |
Which transistor bias circuit arrangement has poor stability because its Q-point varies widely with |
| A. | base bias |
| B. | collector-feedback bias |
| C. | voltage-divider bias |
| D. | emitter bias |
| Answer» B. collector-feedback bias | |
| 343. |
What is the most common bias circuit? |
| A. | base |
| B. | collector |
| C. | emitter |
| D. | voltage-divider |
| Answer» E. | |
| 344. |
Emitter bias requires |
| A. | only a positive supply voltage. |
| B. | only a negative supply voltage. |
| C. | no supply voltage. |
| D. | both positive and negative supply voltages. |
| Answer» E. | |
| 345. |
Which transistor bias circuit provides good Q-point stability with a single-polarity supply voltage? |
| A. | base bias |
| B. | collector-feedback bias |
| C. | voltage-divider bias |
| D. | emitter bias |
| Answer» D. emitter bias | |
| 346. |
Refer to this figure. In the voltage-divider biased npn transistor circuit, if R2 opens, the transistor is |
| A. | saturated. |
| B. | cutoff. |
| C. | nonconducting. |
| Answer» B. cutoff. | |
| 347. |
In which of the following applications is a pulsating dc voltage suitable? |
| A. | Battery charger |
| B. | Radio |
| C. | Stereo system |
| D. | Computer |
| Answer» B. Radio | |
| 348. |
Back-to-back varactor diodes are used for what reason? |
| A. | over-voltage protection |
| B. | a wider tuning range |
| C. | to eliminate harmonic distortion |
| D. | no reason; only zeners are used in a back-to-back configuration |
| Answer» D. no reason; only zeners are used in a back-to-back configuration | |
| 349. |
Refer to this figure. Which symbol is correct for a photodiode? |
| A. | a |
| B. | b |
| C. | c |
| D. | d |
| E. | e |
| Answer» D. d | |
| 350. |
What type of diode maintains a constant current? |
| A. | LED |
| B. | zener |
| C. | current regulator |
| D. | pin |
| E. | none of the above |
| Answer» D. pin | |
F, and a load current of 40 mA.
load for an RC filter section (R = 50 
IE. Find VE. 
DC?