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.
| 451. |
Ferromagnetic materials have pre-existing magnetic fields. |
| A. | True |
| B. | False |
| Answer» C. | |
| 452. |
The movable part in a relay is the _____. |
| A. | plunger |
| B. | armature |
| C. | cone |
| D. | brushes |
| Answer» C. cone | |
| 453. |
The induced voltage across a stationary conductor in a stationary magnetic field ___. |
| A. | equals 0 V |
| B. | is usually very large |
| C. | varies with time |
| D. | depends on the strength of the magnetic field |
| Answer» B. is usually very large | |
| 454. |
The output of an RL differentiator is taken from across the inductor. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 455. |
The output voltage of an RC integrator will eventually equal the voltage of a single input pulse if the input pulse width is less than 5 time constants. |
| A. | True |
| B. | False |
| Answer» C. | |
| 456. |
The output of a differentiator could be considered a spike when the input pulse width is much longer than 5 time constants. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 457. |
The output of an RC differentiator is taken from across the capacitor. |
| A. | True |
| B. | False |
| Answer» C. | |
| 458. |
If the voltage across a resistor ___, the current flowing through it will increase. |
| A. | increases |
| B. | decreases |
| C. | stays the same |
| D. | Not enough information |
| Answer» B. decreases | |
| 459. |
A magnetic material such as iron can change the course of magnetic lines of force. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 460. |
The voltage supplying the current in the given circuit is _____. |
| A. | 2.5 V |
| B. | 25 V |
| C. | 250 V |
| D. | 2.5 kV |
| Answer» C. 250 V | |
| 461. |
The voltage across a 2.2 k resistor is ___ if 3 mA of current is flowing through it. |
| A. | 6.6 V |
| B. | 7.33 V |
| C. | 1.4 V |
| D. | 0.8 V |
| Answer» B. 7.33 V | |
| 462. |
The power rating for the resistor in the given circuit should be at least ___. |
| A. | 1/4 W |
| B. | 1/2 W |
| C. | 1 W |
| D. | 2 W |
| Answer» C. 1 W | |
| 463. |
Using 4 kWh of power is equivalent to using 2000 W of power for 2 h. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 464. |
The current through a resistor can be found by dividing the resistor's voltage by its ohmic value. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 465. |
The voltage drop across a resistor is simply a difference of potential across that resistor. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 466. |
Doubling the voltage across a resistor will cut the current by half. |
| A. | True |
| B. | False |
| Answer» C. | |
| 467. |
Current and voltage have a nonlinear relationship. |
| A. | True |
| B. | False |
| Answer» C. | |
| 468. |
After the magnetizing force has been removed, the ratio of the remaining magnetic flux to the saturated magnetic flux is called _____________. |
| A. | saturation |
| B. | retentivity |
| C. | hysteresis |
| D. | coercivity |
| Answer» C. hysteresis | |
| 469. |
You can determine the direction of the lines of force surrounding a conductor by using _____. |
| A. | the right-hand rule |
| B. | the left-hand rule |
| C. | Lenz's law |
| D. | Faraday's law |
| Answer» B. the left-hand rule | |
| 470. |
The unit of magnetic flux density is the weber. |
| A. | True |
| B. | False |
| Answer» C. | |
| 471. |
The ability of a material to maintain a magnetized state (without the presence of a magnetizing force) is called retentivity. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 472. |
Magnetic flux flows from the north pole to the south pole within the magnet. |
| A. | True |
| B. | False |
| Answer» C. | |
| 473. |
The Hall voltage is the voltage created by a conductor moving through a magnetic field. |
| A. | True |
| B. | False |
| Answer» C. | |
| 474. |
The ability of a material to maintain a magnetized state (without the presence of a magnetizing force) is called hysteresis. |
| A. | True |
| B. | False |
| Answer» C. | |
| 475. |
What is the power factor if the apparent power of a circuit is 5 W, while the true power is 4 W? |
| A. | 0.0 W |
| B. | 0.8 W |
| C. | 1.0 W |
| D. | 1.25 W |
| Answer» C. 1.0 W | |
| 476. |
If the reactive power of a circuit is 50 mW while the apparent power is 64 mW, then what is the true power of the circuit? |
| A. | 14 mW |
| B. | 36 mW |
| C. | 40 mW |
| D. | 114 mW |
| Answer» D. 114 mW | |
| 477. |
The steady-state condition of an integrator is reached after 5 time constants regardless of the number of input pulses that occur in that amount of time. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 478. |
A differentiator circuit can be used to convert a pulse input to a nearly constant dc output. |
| A. | True |
| B. | False |
| Answer» C. | |
| 479. |
The quantity that represents an ideal capacitor dissipating 0 W of power is |
| A. | instantaneous power |
| B. | true power |
| C. | reactive power |
| D. | resistive power |
| Answer» C. reactive power | |
| 480. |
If a capacitor is placed across a 20 V source, what will be the amount of charge after 5 tc? |
| A. | 5.0 V |
| B. | 12.8 V |
| C. | 13.5 V |
| D. | 20 V |
| Answer» E. | |
| 481. |
What is the impedance of an ac RC parallel circuit if the resistance is 12 ohms and the capacitive reactance equals 5 ohms? |
| A. | 0.2 ohms |
| B. | 3.5 ohms |
| C. | 4.6 ohms |
| D. | 13 ohms |
| Answer» D. 13 ohms | |
| 482. |
With 6 V applied, what is the voltage across R2 of a parallel combination of R2 (1 k ), R3 (2 k ), and R4 (1 k ) in series with R1, whose value is 2 k ? |
| A. | 1 V |
| B. | 3 V |
| C. | 5 V |
| D. | 6 V |
| Answer» B. 3 V | |
| 483. |
What is the power dissipated by R1, R2, and R3? |
| A. | P1 = 0.13 W, P2 = 0.26 W, P3 = 0.12 W |
| B. | P1 = 0.26 W, P2 = 0.52 W, P3 = 0.23 W |
| C. | P1 = 0.52 W, P2 = 0.92 W, P3 = 0.46 W |
| D. | P1 = 1.04 W, P2 = 1.84 W, P3 = 0.92 W |
| Answer» C. P1 = 0.52 W, P2 = 0.92 W, P3 = 0.46 W | |
| 484. |
If R1 is in series with a parallel combination of R2, R3, and R4, when the resistance value of R2 increases, the voltage across R3 will |
| A. | increase |
| B. | decrease |
| C. | remain the same |
| D. | Cannot tell |
| Answer» B. decrease | |
| 485. |
A Wheatstone bridge can be used to determine an unknown |
| A. | current |
| B. | resistance |
| C. | power |
| D. | voltage |
| Answer» C. power | |
| 486. |
How much current is flowing through R1 in the given circuit? |
| A. | 0.3 A |
| B. | 0.15 A |
| C. | 0.5 A |
| D. | 0.68 A |
| Answer» D. 0.68 A | |
| 487. |
If R1 is in series with parallel connected to R2 and R3, what happens to total current if R2 opens? |
| A. | increases |
| B. | decreases |
| C. | remains the same |
| D. | cannot tell |
| Answer» C. remains the same | |
| 488. |
The first goal(s) to accomplish in analyzing a complex series parallel circuit is to: |
| A. | equate all parallel components |
| B. | equate all series components |
| C. | solve for all the voltage drops |
| D. | solve for the total current and resistance |
| Answer» E. | |
| 489. |
If a series parallel circuit has all 30-ohm resistors, what is the total resistance when R1 is in series with a parallel circuit consisting of R2 and R3? |
| A. | 10 ohms |
| B. | 20 ohms |
| C. | 45 ohms |
| D. | 90 ohms |
| Answer» D. 90 ohms | |
| 490. |
If the load in the given circuit is 12 k , what is the loaded output voltage? |
| A. | 5.88 V |
| B. | 14.12 V |
| C. | 16 V |
| D. | 17.14 V |
| Answer» C. 16 V | |
| 491. |
If a Wheatstone bridge is balanced, a voltmeter in the center of the bridge will read: |
| A. | the same as the source voltage |
| B. | half the source voltage |
| C. | zero volts |
| D. | twice the source voltage |
| Answer» D. twice the source voltage | |
| 492. |
What is the voltage to the load? |
| A. | 11.4 V |
| B. | 12.4 V |
| C. | 13.4 V |
| D. | 15.4 V |
| Answer» E. | |
| 493. |
The first goal to accomplish in analyzing a complex series-parallel circuit is to |
| A. | equate all parallel components |
| B. | equate all series components |
| C. | solve for all the voltage drops |
| D. | solve for the total current and resistance |
| Answer» E. | |
| 494. |
What are the branch currents I2 and I3? |
| A. | I2 = 4 mA, I3 = 2 mA |
| B. | I2 = 4.5 mA, I3 = 2.5 mA |
| C. | I2 = 2.5 mA, I3 = 1.5 mA |
| D. | I2 = 5.5 mA, I3 = 3.5 mA |
| Answer» D. I2 = 5.5 mA, I3 = 3.5 mA | |
| 495. |
If the load in the given circuit is open, what is the unloaded output voltage? |
| A. | 0 V |
| B. | 4 V |
| C. | 16 V |
| D. | 20 V |
| Answer» D. 20 V | |
| 496. |
How much voltage is dropped across R3 in the given circuit? |
| A. | 46 V |
| B. | 34 V |
| C. | 23 V |
| D. | 12 V |
| Answer» E. | |
| 497. |
With 21 V applied, if R1 = 5 ohms, R2 = 35 ohms, and R3 = 14 ohms, what is the current of R2 if R1 is series connected with parallel circuit R2 and R3? |
| A. | 200 mA |
| B. | 800 mA |
| C. | 600 mA |
| D. | 400 mA |
| Answer» E. | |
| 498. |
Components or combinations of components with common currents, in a series parallel circuit, are in: |
| A. | parallel with each other |
| B. | series with each other |
| C. | either series or parallel with each other |
| D. | none of the above |
| Answer» D. none of the above | |
| 499. |
What determines if resistor connections are in series, parallel, or series parallel? |
| A. | the voltage source |
| B. | the power source |
| C. | resistance |
| D. | current flow |
| Answer» E. | |
| 500. |
When placed into a circuit, how are electronic components usually connected? |
| A. | positive terminal to positive terminal |
| B. | in parallel |
| C. | as a combination of series and parallel |
| D. | in series |
| Answer» D. in series | |