MCQOPTIONS
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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.
| 501. |
Find the total current through R3 in the given circuit. |
| A. | 7.3 mA |
| B. | 5.5 mA |
| C. | 12.8 mA |
| D. | 1.8 mA |
| Answer» E. | |
| 502. |
A 680 load resistor, RL, is connected across a constant current source of 1.2 A. The internal source resistance, RS, is 12 k. The load current, RL, is |
| A. | 0 A |
| B. | 1.2 A |
| C. | 114 mA |
| D. | 1.14 A |
| Answer» E. | |
| 503. |
Find the current through R2 of the given circuit. |
| A. | 30.7 mA |
| B. | 104 mA |
| C. | 74 mA |
| D. | 134 mA |
| Answer» E. | |
| 504. |
Which of the following capacitors is polarized? |
| A. | mica |
| B. | ceramic |
| C. | plastic-film |
| D. | electrolytic |
| Answer» E. | |
| 505. |
In a certain transformer, the input power to the primary is 120 W. If 8.5 W are lost to the winding resistance, what is the output power to the load, neglecting any other issues? |
| A. | 0 W |
| B. | 14.1 W |
| C. | 111.5 W |
| D. | 1,020 W |
| Answer» D. 1,020 W | |
| 506. |
When a 6 V battery is connected across the primary of a transformer with a turns ratio of 8, the secondary voltage is |
| A. | 0 V |
| B. | 6 V |
| C. | 48 V |
| D. | 0.75 V |
| Answer» B. 6 V | |
| 507. |
What is the coefficient of coupling for a transformer in which 4% of the total flux generated in the primary does not pass through the secondary? |
| A. | 0.4 |
| B. | 4 |
| C. | 9.6 |
| D. | 0.96 |
| Answer» E. | |
| 508. |
A 12 kHz voltage is applied to a 0.33 F capacitor, and 200 mA of rms current is measured. What is the value of the voltage? |
| A. | 8 V |
| B. | 80 V |
| C. | 80 mV |
| D. | 800 mV |
| Answer» B. 80 V | |
| 509. |
A 0.01 F capacitor equals how many picofarads? |
| A. | 100 pF |
| B. | 1,000 pF |
| C. | 10,000 pF |
| D. | 100,000 pF |
| Answer» D. 100,000 pF | |
| 510. |
A sine wave voltage is applied across a capacitor. When the frequency of the voltage is decreased, the current |
| A. | increases |
| B. | remains constant |
| C. | decreases |
| D. | ceases |
| Answer» D. ceases | |
| 511. |
Of the following capacitors, which one has the highest dielectric constant? |
| A. | air |
| B. | mica |
| C. | glass |
| D. | paper |
| Answer» D. paper | |
| 512. |
A 4.7 M resistor is in series with a 0.015 F capacitor. The combination is across a 12 V source. How long does it take the capacitor to fully charge? |
| A. | 35 ms |
| B. | 352 ms |
| C. | 3.5 s |
| D. | 70.5 ms |
| Answer» C. 3.5 s | |
| 513. |
A capacitor of 0.02 F is larger than |
| A. | 0.000020 F |
| B. | 200,000 pF |
| C. | 2,000 pF |
| D. | all of the above |
| Answer» D. all of the above | |
| 514. |
Five time constants are required for a capacitor to charge fully or discharge fully. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 515. |
Capacitance is directly proportional to plate area and plate separation. |
| A. | True |
| B. | False |
| Answer» C. | |
| 516. |
The true power in a capacitor is zero. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 517. |
A capacitor blocks ac but passes dc. |
| A. | True |
| B. | False |
| Answer» C. | |
| 518. |
Energy is stored by a capacitor in a magnetic field. |
| A. | True |
| B. | False |
| Answer» C. | |
| 519. |
XC is inversely proportional to frequency and capacitance. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 520. |
Voltage leads current by 90 in a capacitor. |
| A. | True |
| B. | False |
| Answer» C. | |
| 521. |
Total parallel capacitance is less than that of the smallest capacitor in parallel. |
| A. | True |
| B. | False |
| Answer» C. | |
| 522. |
The ohm is the unit of capacitance. |
| A. | True |
| B. | False |
| Answer» C. | |
| 523. |
The dielectric constant is the ability of a material to establish an electric field. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 524. |
An uncharged capacitor and a 1 k resistor are connected in series with a switch and a 6 V battery. At the instant the switch is closed, the voltage across the capacitor is |
| A. | 6 V |
| B. | 3 V |
| C. | 2 V |
| D. | 0 V |
| Answer» E. | |
| 525. |
When the voltage across a capacitor is tripled, the stored charge |
| A. | triples |
| B. | is cut to one-third |
| C. | stays the same |
| D. | doubles |
| Answer» B. is cut to one-third | |
| 526. |
A 330 pF capacitor and a 220 pF capacitor are each connected across a 6 V dc source. The voltage across the 330 pF capacitor is |
| A. | 3 V |
| B. | 6 V |
| C. | 4 V |
| D. | 0 V |
| Answer» C. 4 V | |
| 527. |
When the plate area of a capacitor increases, |
| A. | the capacitance increases |
| B. | the capacitance decreases |
| C. | the capacitance is unaffected |
| D. | the voltage it can withstand increases. |
| Answer» B. the capacitance decreases | |
| 528. |
Referring to circuit given, if R1 is changed to a 68 resistor, what will be the current through it? |
| A. | 0.16 A |
| B. | 0.24 A |
| C. | 0.2 A |
| D. | 0.04 A |
| Answer» B. 0.24 A | |
| 529. |
A 12 mA current source has an internal resistance, RS, of 1.2 k. The equivalent voltage source is |
| A. | 144 V |
| B. | 14.4 V |
| C. | 7.2 V |
| D. | 72 mV |
| Answer» C. 7.2 V | |
| 530. |
An 18 V source has an internal resistance of 70 . If a load resistance of 33 is connected to the voltage source, the load power, PL, is |
| A. | 0 W |
| B. | 1 W |
| C. | 175 mW |
| D. | 18 mW |
| Answer» C. 175 mW | |
| 531. |
A 120 load is connected across an ideal voltage source with VS = 12 V. The voltage across the load |
| A. | is 0 V |
| B. | is 12 V |
| C. | is 120 V |
| D. | cannot be determined |
| Answer» C. is 120 V | |
| 532. |
A 120 load is connected across a voltage source with VS = 12 V and RS = 8 . The voltage across the load is |
| A. | 11.25 V |
| B. | 0 V |
| C. | 12 V |
| D. | 1.13 V |
| Answer» B. 0 V | |
| 533. |
Referring to the given circuit, the voltage and current for the load resistor, RL, is |
| A. | 450 mV, 4.5 mA |
| B. | 4.50 V, 45 mA |
| C. | 4.50 V, 4.5 mA |
| D. | 450 mV, 45 mA |
| Answer» D. 450 mV, 45 mA | |
| 534. |
Find the current in R2 of the given circuit, using the superposition theorem. |
| A. | 16.7 mA |
| B. | 33.3 mA |
| C. | 50 mA |
| D. | 16.6 mA |
| Answer» D. 16.6 mA | |
| 535. |
A basic one-loop dc generator is rotated at 90 rev/s. How many times each second does the dc output voltage peak (reach maximum)? |
| A. | 90 |
| B. | 180 |
| C. | 270 |
| D. | 360 |
| Answer» C. 270 | |
| 536. |
A 470 RL is connected across a voltage source, VS, of 120 V. The source's internal resistance, RS, is 12 . What is the output voltage across the load? |
| A. | 120 V |
| B. | 0 V |
| C. | 117 V |
| D. | 12 V |
| Answer» D. 12 V | |
| 537. |
The direction of a magnetic field within a magnet is |
| A. | from south to north |
| B. | from north to south |
| C. | back to front |
| D. | front to back |
| Answer» B. from north to south | |
| 538. |
There is 900 mA of current through a wire with 40 turns. What is the reluctance of the circuit if the flux is 400 Wb? |
| A. | 14,400 At/Wb |
| B. | 1,440 At/Wb |
| C. | 9,000 At/Wb |
| D. | 90,000 At/Wb |
| Answer» E. | |
| 539. |
The ability of a material to remain magnetized after removal of the magnetizing force is known as |
| A. | permeability |
| B. | reluctance |
| C. | hysteresis |
| D. | retentivity |
| Answer» E. | |
| 540. |
When the north poles of two bar magnets are brought close together, there will be |
| A. | no force |
| B. | a downward force |
| C. | a force of attraction |
| D. | a force of repulsion |
| Answer» E. | |
| 541. |
The unit for permeability is |
| A. | Wb/At m |
| B. | At/m |
| C. | At/Wb |
| D. | Wb |
| Answer» B. At/m | |
| 542. |
What is the magnetomotive force in a 75-turn coil of wire when there are 4 A of current through it? |
| A. | 18.75 At |
| B. | 30 At |
| C. | 300 At |
| D. | 187 At |
| Answer» D. 187 At | |
| 543. |
The induced voltage across a stationary conductor in a stationary magnetic field is |
| A. | zero |
| B. | reversed in polarity |
| C. | increased |
| D. | decreased |
| Answer» B. reversed in polarity | |
| 544. |
The voltage induced across a certain coil is 200 mV. A 120 resistor is connected to the coil terminals. The induced current is |
| A. | 1.7 mA |
| B. | 16 mA |
| C. | 12 mA |
| D. | 120 mA |
| Answer» B. 16 mA | |
| 545. |
A coil of wire is placed in a changing magnetic field. If the number of turns in the coil is decreased, the voltage induced across the coil will |
| A. | increase |
| B. | decrease |
| C. | remain constant |
| D. | be excessive |
| Answer» C. remain constant | |
| 546. |
The unit for reluctance is |
| A. | tesla |
| B. | At/Wb |
| C. | At/m |
| D. | Wb |
| Answer» C. At/m | |
| 547. |
What is the reluctance of a material that has a length of 0.07 m, a cross-sectional area of 0.014 m2, and a permeability of 4,500 Wb/At m? |
| A. | 1111 At/Wb |
| B. | 111 At/Wb |
| C. | 11 At/Wb |
| D. | 1 At/Wb |
| Answer» B. 111 At/Wb | |
| 548. |
A 2 RL is connected across a voltage source, VS, of 110 V. The source's internal resistance is 24 . What is the output voltage across the load? |
| A. | 8.5 V |
| B. | 85 V |
| C. | 0 V |
| D. | 110 V |
| Answer» B. 85 V | |
| 549. |
If the steel disk in a crankshaft position sensor has stopped with the tab in the magnet's air gap, the induced voltage |
| A. | increases |
| B. | decreases |
| C. | is zero |
| D. | will remain constant |
| Answer» D. will remain constant | |
| 550. |
When a solenoid is activated, the force that moves the plunger is |
| A. | an electromagnetic field |
| B. | a permanent magnetic field |
| C. | varying voltage |
| D. | a steady current |
| Answer» B. a permanent magnetic field | |