MCQOPTIONS
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MCQOPTIONS
This section includes 682 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 451. |
Capacitance increases with |
| A. | increase in plate area and decrease in distance between the plates |
| B. | increase in plate area and distance between the plates |
| C. | decrease in plate area and value of applied voltage |
| D. | reduction in plate area and distance between the plates |
| Answer» B. increase in plate area and distance between the plates | |
| 452. |
When a dielectric slab is introduced in a parallel plate capacitor, the potential difference between plates will |
| A. | remain uncharged |
| B. | decrease |
| C. | increase |
| D. | become zero |
| Answer» C. increase | |
| 453. |
In a capacitive circuit |
| A. | a steady value of applied voltage causes discharge |
| B. | an increase in applied voltage makes a capacitor charge |
| C. | decrease in applied voltage makes a capacitor charge |
| D. | none of the above |
| Answer» C. decrease in applied voltage makes a capacitor charge | |
| 454. |
Which of the following capacitors has relatively shorter shelf life ? |
| A. | mica capacitor |
| B. | electrolytic capacitor |
| C. | ceramic capacitor |
| D. | paper capacitor |
| Answer» C. ceramic capacitor | |
| 455. |
Which of the following statements is incorrect ? |
| A. | the leakage resistance of ceramic capacitors is generally high |
| B. | the stored energy in a capacitor decreases with reduction in value of capacitance |
| C. | the stored energy in a capacitor increases with applied voltage |
| D. | a wire cable has distributed capacitance between the conductors |
| Answer» C. the stored energy in a capacitor increases with applied voltage | |
| 456. |
In the case of a lossy capacitor, its series equivalent resistance value will be |
| A. | small |
| B. | very small |
| C. | large |
| D. | zero |
| Answer» D. zero | |
| 457. |
Which of the following capacitors will have the least variation ? |
| A. | paper capacitor |
| B. | ceramic capacitor |
| C. | silver plated mica capacitor |
| D. | none of the above |
| Answer» D. none of the above | |
| 458. |
Which of the following materials has the highest value of dielectric constant? |
| A. | glass |
| B. | vacuum |
| C. | ceramics |
| D. | oil |
| Answer» D. oil | |
| 459. |
Which of the following expression is correct for electric field strength ? |
| A. | e = d/e |
| B. | e = d2/t |
| C. | e = jtd |
| D. | e= nd2 |
| Answer» B. e = d2/t | |
| 460. |
Which of the following statement is true ? |
| A. | the current in the discharging capacitor grows linearly |
| B. | the current in the dicharging capacitor grows exponentially |
| C. | the current in the discharging capacitor decays exponentially |
| D. | the current in the discharging capacitor decreases constantly |
| Answer» C. the current in the discharging capacitor decays exponentially | |
| 461. |
In a capacitor the electric charge is stored in |
| A. | metal plates |
| B. | dielectric |
| C. | both (a) and (6) |
| D. | none of the above |
| Answer» C. both (a) and (6) | |
| 462. |
For which of the following parameter variation, the capacitance of the capacitor remains unaffected ? |
| A. | distance between plates |
| B. | area of the plates |
| C. | nature of dielectric |
| D. | thickness of the plates |
| Answer» E. | |
| 463. |
Three capacitors each of the capacity C are given. The resultant capacity 2/3 C can be obtained by using them |
| A. | all in series |
| B. | all in parallel |
| C. | two in parallel and third in series with this combination |
| D. | two in series and third in parallel across this combination |
| Answer» D. two in series and third in parallel across this combination | |
| 464. |
The dissipation factor of a good dielectric is of the order of |
| A. | 0.0002 |
| B. | 0.002 |
| C. | 0.02 |
| D. | 0.2 |
| Answer» B. 0.002 | |
| 465. |
If A.C. voltage is applied to capacitive circuit, the alternating current can flow in the circuit because |
| A. | varying voltage produces the charg¬ing and dicharging currents |
| B. | of high peak value |
| C. | charging current can flow |
| D. | discharge current can flow |
| Answer» B. of high peak value | |
| 466. |
Two plates of a parallel plate capacitor after being charged from a constant voltage source are separated apart by means of insulated handles, then the |
| A. | voltage across the plates increases |
| B. | voltage across the plates decreases |
| C. | charge on the capacitor decreases |
| D. | charge on the capacitor increases |
| Answer» C. charge on the capacitor decreases | |
| 467. |
Which of the following is not a vector ? |
| A. | linear momentum |
| B. | angular momentum |
| C. | electric field |
| D. | electric potential |
| Answer» C. electric field | |
| 468. |
A dielectric material must be |
| A. | resistor |
| B. | insulator |
| C. | good conductor |
| D. | semi conductor |
| Answer» C. good conductor | |
| 469. |
If three 10 uF capacitors are connected in parallel, the net cararitance is |
| A. | 20 uf |
| B. | 30 ue |
| C. | 40 uf |
| D. | 50 uf |
| Answer» C. 40 uf | |
| 470. |
The units of capacitance are |
| A. | volts/coulomb |
| B. | coulombs/volt |
| C. | ohms |
| D. | henry/wb |
| Answer» C. ohms | |
| 471. |
For making a capacitor, it is better to select a dielectric having |
| A. | low permittivity |
| B. | high permittivity |
| C. | permittivity same as that of air |
| D. | permittivity slightly more than that of air |
| Answer» C. permittivity same as that of air | |
| 472. |
A capacitor stores 0.24 coulombs at 10 volts. Its capacitance is |
| A. | 0.024 f |
| B. | 0.12 f |
| C. | 0.6 f |
| D. | 0.8 f |
| Answer» B. 0.12 f | |
| 473. |
If the sheet of a bakelite is inserted between the plates of an air capacitor, the capacitance will |
| A. | decrease |
| B. | increase |
| C. | remains unchanged |
| D. | become zero |
| Answer» C. remains unchanged | |
| 474. |
The ability of charged bodies to exert force on 6ne another is attributed to the existence of |
| A. | electrons |
| B. | protons |
| C. | neutrons |
| D. | electric field |
| Answer» E. | |
| 475. |
A field line and an equipotential surface are |
| A. | always parallel |
| B. | always at 90° |
| C. | inclined at any angle 0 |
| D. | none of the above |
| Answer» C. inclined at any angle 0 | |
| 476. |
The direction of electric field due +0 positive charge is . |
| A. | away from the charge |
| B. | towards the charge |
| C. | both (a) and (6) |
| D. | none of the above |
| Answer» B. towards the charge | |
| 477. |
The lines of force due to charged particles are |
| A. | always straight |
| B. | always curved |
| C. | sometimes curved |
| D. | none of the above |
| Answer» C. sometimes curved | |
| 478. |
The electric field at a point situated at a distance d from straight charged conductor is |
| A. | proportional to d |
| B. | inversely proportional to d |
| C. | inversely proportional to d |
| D. | none of the above |
| Answer» C. inversely proportional to d | |
| 479. |
The electric field intensity at a point situated 4 metres from a point charge is 200 N/C. If the distance is reduced to 2 metres, the field intensity will be |
| A. | 400 n/c |
| B. | 600 n/c |
| C. | 800 n/c |
| D. | 1200 n/c |
| Answer» D. 1200 n/c | |
| 480. |
The force between two charges is 120 N. If the distance between the charges is doubled, the force will be |
| A. | 60 n |
| B. | 30 n |
| C. | 40 n |
| D. | 15 n |
| Answer» C. 40 n | |
| 481. |
capacitors have a high leakage voltage. |
| A. | electrolyte capacitor |
| B. | variable capacitor |
| C. | "c) air capacitor |
| D. | polyester capacitor |
| Answer» E. | |
| 482. |
The type of capacitors used in communication transmitters are? |
| A. | electrolyte capacitor |
| B. | variable capacitor |
| C. | air capacitor |
| D. | glass capacitor |
| Answer» C. air capacitor | |
| 483. |
Capacitor preferred when there is high frequency in the circuits is _ |
| A. | electrolyte capacitor |
| B. | mica capacitor |
| C. | air capacitor |
| D. | glass capacitor |
| Answer» C. air capacitor | |
| 484. |
The simplest kind of capacitor is _ |
| A. | ceramic capacitor |
| B. | electrolyte capacitor |
| C. | tuning capacitor |
| D. | paper capacitor |
| Answer» E. | |
| 485. |
Which capacitors relatively costly? |
| A. | electrolyte capacitor |
| B. | mica capacitor |
| C. | air capacitor |
| D. | glass capacitor |
| Answer» C. air capacitor | |
| 486. |
In a variable capacitor, capacitance can be varied by |
| A. | turning the rotatable plates in or out |
| B. | sliding the rotatable plates |
| C. | changing the plates |
| D. | changing the material of plates |
| Answer» B. sliding the rotatable plates | |
| 487. |
A capacitor using chemical reactions to store charge is _ |
| A. | paper capacitor |
| B. | ceramic capacitor |
| C. | polyester capacitor |
| D. | electrolyte capacitor |
| Answer» E. | |
| 488. |
Paper capacitor is a type of _ |
| A. | fixed capacitor |
| B. | variable capacitor |
| C. | either fixed or variable depending on its usage |
| D. | neither fixed nor variable |
| Answer» B. variable capacitor | |
| 489. |
Which, among the following, is the odd one out? |
| A. | ceramic capacitor |
| B. | electrolyte capacitor |
| C. | tuning capacitor |
| D. | paper capacitor |
| Answer» D. paper capacitor | |
| 490. |
The free electrons in practical dielectrics are due to |
| A. | there are no free electrons |
| B. | conductors |
| C. | impurities |
| D. | displacement currents |
| Answer» D. displacement currents | |
| 491. |
Magnetic fields between the parallel plates of a capacitor are due to? |
| A. | displacement current |
| B. | conduction current |
| C. | both conduction and displacement current |
| D. | neither conduction nor displacement current |
| Answer» B. conduction current | |
| 492. |
Displacement current depends on _ |
| A. | moving charges |
| B. | change in time |
| C. | both moving charges and change in time |
| D. | neither moving charges nor change in time |
| Answer» C. both moving charges and change in time | |
| 493. |
What is the unit for displacement current? |
| A. | no unit |
| B. | ampere |
| C. | coulomb |
| D. | ampere/coulomb |
| Answer» C. coulomb | |
| 494. |
Under normal conditions capacitors have _ |
| A. | displacement current |
| B. | conduction current |
| C. | both conduction and displacement current |
| D. | neither conduction nor displacement current |
| Answer» B. conduction current | |
| 495. |
What is the type of current caused due to variations in the field? |
| A. | displacement current |
| B. | conduction current |
| C. | both conduction and displacement current |
| D. | neither conduction nor displacement current |
| Answer» B. conduction current | |
| 496. |
What is the type of current where the electrons actually move? |
| A. | displacement current |
| B. | conduction current |
| C. | both conduction and displacement current |
| D. | neither conduction nor displacement current |
| Answer» C. both conduction and displacement current | |
| 497. |
The flow of electrons which does not pass through the battery is known as |
| A. | displacement current |
| B. | leakage current |
| C. | either displacement or leakage current |
| D. | neither displacement nor leakage current |
| Answer» B. leakage current | |
| 498. |
The flow of electrons in dielectric is due to |
| A. | conduction |
| B. | potential difference |
| C. | breakdown |
| D. | resistance |
| Answer» D. resistance | |
| 499. |
The free electrons in practical dielectrics is due to _ |
| A. | there are no free electrons |
| B. | conductors |
| C. | impurities |
| D. | both conductors and impurities |
| Answer» D. both conductors and impurities | |
| 500. |
What is the conduction current when a capacitor is fully charged? |
| A. | infinity |
| B. | zero |
| C. | 100a d) 1000a |
| Answer» C. 100a d) 1000a | |