MCQOPTIONS
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MCQOPTIONS
This section includes 1728 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 301. |
If C1, a 4.7 F capacitor, and C2, a 3.3 F capacitor are in series with 18 Vdc applied, what is the voltage across C1? |
| A. | 3.3 V |
| B. | 7.4 V |
| C. | 6.6 V |
| D. | 9.4 V |
| Answer» C. 6.6 V | |
| 302. |
What is the impedance of a series RC circuit that consists of a 0.22 F capacitor and a 200-ohm resistor connected to a 3 kHz source? |
| A. | 214 ohms |
| B. | 313 ohms |
| C. | 414 ohms |
| D. | 880 ohms |
| Answer» C. 414 ohms | |
| 303. |
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 | |
| 304. |
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 | |
| 305. |
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. | |
| 306. |
In a capacitive circuit, current flow is limited to |
| A. | charging periods |
| B. | discharging periods |
| C. | neither charging periods nor discharging periods |
| D. | both charging periods and discharging periods |
| Answer» E. | |
| 307. |
What circuit has the following frequency response? |
| A. | bandpass filter |
| B. | high-pass filter |
| C. | low-pass filter |
| D. | integrator |
| Answer» D. integrator | |
| 308. |
A capacitor is constructed of two parallel: |
| A. | conductors |
| B. | semiconductors |
| C. | inductors |
| D. | dielectrics |
| Answer» B. semiconductors | |
| 309. |
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. | |
| 310. |
Most older types of paper capacitors have been replaced by which type of construction?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 | |
| 311. |
In an ac circuit, an output capacitor and a 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» C. high-pass | |
| 312. |
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 | |
| 313. |
If an open capacitor is checked with an ohmmeter, the needle will: |
| A. | stay on zero |
| B. | stay on infinity |
| C. | move from zero to infinity |
| D. | move from infinity to zero |
| Answer» C. move from zero to infinity | |
| 314. |
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 | |
| 315. |
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 | |
| 316. |
What is this circuit? |
| A. | bandpass filter |
| B. | high-pass filter |
| C. | low-pass filter |
| D. | differentiator |
| Answer» C. low-pass filter | |
| 317. |
What is the current through XC1 in the given circuit? |
| A. | 32.2 mA |
| B. | 16 mA |
| C. | 12 mA |
| D. | 48 mA |
| Answer» B. 16 mA | |
| 318. |
What is the total current in the given circuit? |
| A. | 0.28 A |
| B. | 0.399 A |
| C. | 909 A |
| D. | 0.2 A |
| Answer» B. 0.399 A | |
| 319. |
Which statement about a series RC circuit is true? |
| A. | The capacitor's voltage drop is in phase with the resistor's voltage drop. |
| B. | The current leads the source voltage. |
| C. | The current lags the source voltage. |
| D. | The resistor voltage lags the current. |
| Answer» C. The current lags the source voltage. | |
| 320. |
If the frequency increases in the given circuit, how would the total current change? |
| A. | The total current would increase. |
| B. | The total current would decrease. |
| C. | The total current would remain the same. |
| D. | More information is needed in order to predict how the total current would change. |
| Answer» B. The total current would decrease. | |
| 321. |
What is the effect of increasing the resistance in a series RC circuit? |
| A. | There will be no effect at all. |
| B. | The current will increase. |
| C. | The phase shift will decrease. |
| D. | The input voltage will increase. |
| Answer» D. The input voltage will increase. | |
| 322. |
Calculate the phase angle in the given circuit. |
| A. | 0 |
| B. | 90 |
| C. | 22.52 |
| D. | 67.48 |
| Answer» E. | |
| 323. |
What is the phase angle for a parallel circuit consisting of a 500 kHz, 5 Vac source with a 47 pF capacitor, and a 4.7 k resistor in parallel? |
| A. | 55.3 |
| B. | 55.3 |
| C. | 34.8 |
| D. | 34.8 |
| Answer» D. 34.8 | |
| 324. |
What is the phase angle in the given circuit? |
| A. | 14.95 |
| B. | 36.88 |
| C. | 0 |
| D. | 90 |
| Answer» B. 36.88 | |
| 325. |
After which time constant can a capacitor be considered to be fully charged? |
| A. | first |
| B. | third |
| C. | fifth |
| D. | seventh |
| Answer» D. seventh | |
| 326. |
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 | |
| 327. |
What is the total opposition to current in a series RC circuit called? |
| A. | impedance |
| B. | inductance |
| C. | reactance |
| D. | resistance |
| Answer» B. inductance | |
| 328. |
As a capacitor is being charged, the voltage across its terminals will: |
| A. | increase |
| B. | decrease |
| C. | remain the same |
| D. | oppose the source |
| Answer» B. decrease | |
| 329. |
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. | 5.0 |
| Answer» C. 13.5 | |
| 330. |
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. | |
| 331. |
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 | |
| 332. |
If a charged capacitor is disconnected from a circuit, it will: |
| A. | immediately discharge |
| B. | recharge |
| C. | remain charged |
| D. | leak the charge |
| Answer» E. | |
| 333. |
The component that produces power in an electromagnetic generator is called the |
| A. | armature |
| B. | field winding |
| C. | commutator |
| D. | brush |
| Answer» B. field winding | |
| 334. |
What is the magnetomotive force in a 150-turn coil of wire with 2 A flowing through it? |
| A. | 13.33 mAt |
| B. | 300 At |
| C. | 75 At |
| D. | 152 At |
| Answer» C. 75 At | |
| 335. |
A Hall effect sensor |
| A. | exists only in theory |
| B. | is a noncontacting magnetic sensor |
| C. | can operate only a few times before failure |
| D. | produces very large voltages |
| Answer» C. can operate only a few times before failure | |
| 336. |
In a 20 Vac series RC circuit, if 20 V is read across the resistor and 40 V is measured across the capacitor, the applied voltage is |
| A. | 45 Vac |
| B. | 50 Vac |
| C. | 60 Vac |
| D. | 65 Vac |
| Answer» B. 50 Vac | |
| 337. |
Which of the following is the reference vector for parallel RC circuits? |
| A. | <i>R</i> |
| B. | <i>V</i> |
| C. | <i>I</i> |
| D. | <i>X<sub>C</sub></i> |
| Answer» C. <i>I</i> | |
| 338. |
What is the voltage drop across R1 in the given circuit? |
| A. | 10 V |
| B. | 4.80 V |
| C. | 4.00 V |
| D. | 5.80 V |
| Answer» E. | |
| 339. |
Power that is measured in volt-amperes is called |
| A. | impedance power |
| B. | reactive power |
| C. | true power |
| D. | apparent power |
| Answer» E. | |
| 340. |
The polarity of induced voltage while a field is collapsing is |
| A. | independent of the force creating the field |
| B. | opposite to the force creating the field |
| C. | identical to the force creating the field |
| D. | present only if the force is stationary |
| Answer» C. identical to the force creating the field | |
| 341. |
Which electromagnetic device has a movable iron core called a plunger? |
| A. | A speaker |
| B. | A dc generator |
| C. | A relay |
| D. | A solenoid |
| Answer» E. | |
| 342. |
Which electromagnetic device contains an armature? |
| A. | A speaker |
| B. | A dc generator |
| C. | A relay |
| D. | A solenoid |
| Answer» C. A relay | |
| 343. |
Select the equation below that represents the relationship between charge, capacitance, and voltage for a capacitor. |
| A. | Q = CV |
| B. | C = QV |
| C. | <img src="/_files/images/basic-electronics/complete/mca7_1002c1.gif" align="absmiddle"> |
| D. | V = IR |
| Answer» B. C = QV | |
| 344. |
What is the angle theta value for a 5.6 F capacitor and a 50-ohm resistor in series with a 1.1 kHz, 5 Vac source? |
| A. | 27.3 degrees |
| B. | 62.7 degrees |
| C. | 27.3 degrees |
| D. | 62.7 degrees |
| Answer» D. 62.7 degrees | |
| 345. |
Which electromagnetic device uses brushes and a commutator? |
| A. | A speaker |
| B. | A dc generator |
| C. | A relay |
| D. | A solenoid |
| Answer» C. A relay | |
| 346. |
What are the effects of moving a closed wire loop through a magnetic field? |
| A. | A voltage is induced in the wire. |
| B. | A current is induced in the wire. |
| C. | The polarity across the wire depends on the direction of motion. |
| D. | All of the above |
| Answer» E. | |
| 347. |
What is the current flow through R1, R2, and R3? |
| A. | 1A, 1A, 1A |
| B. | 1A, 2A, 3A |
| C. | 3A, 3A, 3A |
| D. | 3A, 2A, 1A |
| Answer» B. 1A, 2A, 3A | |
| 348. |
If the resistance total in a series circuit doubles, current will: |
| A. | be the same |
| B. | be doubled |
| C. | reduce source voltage |
| D. | be halved |
| Answer» E. | |
| 349. |
One of the most common applications of a potentiometer is as an adjustable voltage divider, also known as |
| A. | voltage control |
| B. | current control |
| C. | volume control |
| D. | divider control |
| Answer» D. divider control | |
| 350. |
What is the dc source voltage? |
| A. | 78 V |
| B. | 39 V |
| C. | 13 V |
| D. | 0 V |
| Answer» B. 39 V | |