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.
| 501. |
Leakage in capacitors is primarily caused by |
| A. | transistors |
| B. | resistors |
| C. | inductors |
| D. | dc motors |
| Answer» B. resistors | |
| 502. |
If the thickness of the material increases, what happens to the dielectric strength? |
| A. | increases |
| B. | decreases |
| C. | remains the same |
| D. | becomes zero |
| Answer» C. remains the same | |
| 503. |
Which medium has the highest dielectric strength? |
| A. | water |
| B. | mica |
| C. | air |
| D. | glass |
| Answer» D. glass | |
| 504. |
If the Voltage increases, what happens to dielectric strength? |
| A. | increases |
| B. | decreases |
| C. | remains the same |
| D. | becomes zero |
| Answer» B. decreases | |
| 505. |
The unit for dielectric strength is |
| A. | v/m2 |
| B. | mv/m2 |
| C. | mv/m |
| D. | vm |
| Answer» D. vm | |
| 506. |
Calculate the energy stored in the combination of the capacitors. |
| A. | 192kj |
| B. | 1.92kj |
| C. | 19.2kj |
| D. | 1920j |
| Answer» D. 1920j | |
| 507. |
Calculate the energy in the 4F capacitor. |
| A. | 128kj |
| B. | 1.28kj |
| C. | 12.8kj d) 1280j |
| Answer» D. | |
| 508. |
Calculate the energy in the 2F capacitor. |
| A. | 8.6kj |
| B. | 64kj |
| C. | 64j |
| D. | 6.4kj |
| Answer» E. | |
| 509. |
When do we get maximum energy from a set of capacitors? |
| A. | when they are connected in parallel |
| B. | when they are connected in series |
| C. | both in series and parallel |
| D. | insufficient information provided |
| Answer» B. when they are connected in series | |
| 510. |
Energy stored in 2000mF capacitor charged to a potential difference of 10V is? |
| A. | 100j |
| B. | 200j |
| C. | 300j |
| D. | 400j |
| Answer» B. 200j | |
| 511. |
Work done in charging a capacitor is |
| A. | qv |
| B. | 1â„2qv |
| C. | 2qv |
| D. | qv2 |
| Answer» C. 2qv | |
| 512. |
When a material has zero permittivity, the maximum potential that it can possess is |
| A. | ∞ |
| B. | -∞ |
| C. | unity |
| D. | zero |
| Answer» E. | |
| 513. |
Find the electric field of a potential function given by 20 log x + y at the point (1,1,0). |
| A. | -20 i – j |
| B. | -i -20 j |
| C. | i + j |
| D. | (i + j)/20 |
| Answer» B. -i -20 j | |
| 514. |
Find the charge density from the function of flux density given by 12x – 7z. |
| A. | 19 |
| B. | -5 |
| C. | 5 |
| D. | -19 |
| Answer» D. -19 | |
| 515. |
Poisson equation can be derived from which of the following equations? |
| A. | point form of gauss law |
| B. | integral form of gauss law |
| C. | point form of ampere law |
| D. | integral form of ampere law |
| Answer» B. integral form of gauss law | |
| 516. |
The function V = exsin y + z does not satisfy Laplace equation. State True/False. |
| A. | true |
| B. | false |
| Answer» C. | |
| 517. |
Suppose the potential function is a step function. The equation that gets satisfied is |
| A. | laplace equation |
| B. | poisson equation |
| C. | maxwell equation |
| D. | ampere equation |
| Answer» B. poisson equation | |
| 518. |
If Laplace equation satisfies, then which of the following statements will be true? |
| A. | potential will be zero |
| B. | current will be infinite |
| C. | resistance will be infinite |
| D. | voltage will be same |
| Answer» C. resistance will be infinite | |
| 519. |
In free space, the Poisson equation becomes |
| A. | maxwell equation |
| B. | ampere equation |
| C. | laplace equation |
| D. | steady state equation |
| Answer» D. steady state equation | |
| 520. |
The normal component of which quantity is always discontinuous at the boundary? |
| A. | e |
| B. | d |
| C. | h |
| D. | b |
| Answer» C. h | |
| 521. |
Find the flux density at the boundary when the charge density is given by 24 units. |
| A. | 12 |
| B. | 24 |
| C. | 48 |
| D. | 96 |
| Answer» C. 48 | |
| 522. |
Find the permittivity of the surface when a wave incident at an angle 60 is reflected by the surface at 45 in air. |
| A. | 1.41 |
| B. | 3.5 |
| C. | 2.2 |
| D. | 1.73 |
| Answer» E. | |
| 523. |
Find the electric field if the surface density at the boundary of air is 10-9. |
| A. | 12Ï€ |
| B. | 24Ï€ |
| C. | 36Ï€ |
| D. | 48Ï€ |
| Answer» D. 48Ï€ | |
| 524. |
Choose the best definition of dielectric loss. |
| A. | absorption of electric energy by dielectric in an ac field |
| B. | dissipation of electric energy by dielectric in a static field |
| C. | dissipation of heat by dielectric |
| D. | product of loss tangent and relative permittivity |
| Answer» B. dissipation of electric energy by dielectric in a static field | |
| 525. |
For a conservative field which of the following equations holds good? |
| A. | ∫ e.dl = 0 |
| B. | ∫ h.dl = 0 |
| C. | ∫ b.dl = 0 |
| D. | ∫ d.dl = 0 |
| Answer» B. ∫ h.dl = 0 | |
| 526. |
The charge within a conductor will be |
| A. | 1 |
| B. | -1 |
| C. | ∞ |
| Answer» D. | |
| 527. |
When a dielectric loses its dielectric property, the phenomenon is called |
| A. | dielectric loss |
| B. | dielectric breakdown |
| C. | polarisation |
| D. | magnetization |
| Answer» C. polarisation | |
| 528. |
Calculate the loss tangent when the dielectric constant in AC field is given by 3 + 2j. |
| A. | (2/3) |
| B. | (3/2) |
| C. | (-3/2) |
| D. | (-2/3) |
| Answer» E. | |
| 529. |
Curie-Weiss law is used to calculate which one of the following? |
| A. | permittivity |
| B. | permeability |
| C. | electric susceptibility |
| D. | magnetic susceptibility |
| Answer» D. magnetic susceptibility | |
| 530. |
Curie-Weiss law is applicable to which of the following materials? |
| A. | piezoelectric |
| B. | ferroelectric |
| C. | pyroelectric |
| D. | anti-ferroelectric |
| Answer» C. pyroelectric | |
| 531. |
Solids do not have which type of polarisation? |
| A. | ionic |
| B. | orientational |
| C. | interfacial |
| D. | electronic |
| Answer» D. electronic | |
| 532. |
Which of the following is not an example of elemental solid dielectric? |
| A. | diamond |
| B. | sulphur |
| C. | silicon |
| D. | germanium |
| Answer» D. germanium | |
| 533. |
Compute the refractive index when the dielectric constant is 256 in air. |
| A. | 2562 |
| B. | 16 c) 256 |
| C. | d) 64 |
| Answer» C. d) 64 | |
| 534. |
The total polarisation of a material is the |
| A. | product of all types of polarisation |
| B. | sum of all types of polarisation |
| C. | orientation directions of the dipoles |
| D. | total dipole moments in the material |
| Answer» C. orientation directions of the dipoles | |
| 535. |
In the given types of polarisation, which type exists in the semiconductor? |
| A. | electronic |
| B. | ionic |
| C. | orientational |
| D. | interfacial or space charge |
| Answer» E. | |
| 536. |
Identify which type of polarisation depends on temperature. |
| A. | electronic |
| B. | ionic |
| C. | orientational |
| D. | interfacial |
| Answer» D. interfacial | |
| 537. |
Polarizability is defined as the |
| A. | product of dipole moment and electric field |
| B. | ratio of dipole moment to electric field |
| C. | ratio of electric field to dipole moment |
| D. | product of dielectric constant and dipole moment |
| Answer» C. ratio of electric field to dipole moment | |
| 538. |
The best definition of polarisation is |
| A. | orientation of dipoles in random direction |
| B. | electric dipole moment per unit volume |
| C. | orientation of dipole moments |
| D. | change in polarity of every dipole |
| Answer» C. orientation of dipole moments | |
| 539. |
Find the mean free path of an electron travelling at a speed of 18m/s in 2 seconds. |
| A. | 9 |
| B. | 36 c) 0.11 d) 4.5 |
| Answer» C. | |
| 540. |
The superconducting materials will be independent of which of the following? |
| A. | magnetic field |
| B. | electric field |
| C. | magnetization |
| D. | temperature |
| Answer» C. magnetization | |
| 541. |
The magnetic susceptibility in a superconductor will be |
| A. | positive |
| B. | negative |
| C. | zero |
| D. | infinity |
| Answer» C. zero | |
| 542. |
he magnetic field which destroys the superconductivity is called |
| A. | diamagnetic field |
| B. | ferromagnetic field |
| C. | ferrimagnetic field |
| D. | critical field |
| Answer» E. | |
| 543. |
For a dielectric which of the following properties hold good? |
| A. | they are superconductors at high temperatures |
| B. | they are superconductors at low temperatures |
| C. | they can never become a superconductor |
| D. | they have very less dielectric breakdown voltage |
| Answer» C. they can never become a superconductor | |
| 544. |
Find the dielectric constant for a material with electric susceptibility of 4. |
| A. | 3 |
| B. | 5 |
| C. | 8 |
| D. | 16 |
| Answer» C. 8 | |
| 545. |
A dielectric can be made a conductor by |
| A. | compression |
| B. | heating |
| C. | doping |
| D. | freezing |
| Answer» C. doping | |
| 546. |
Identify a good dielectric. |
| A. | iron |
| B. | ceramics |
| C. | plastic |
| D. | magnesium |
| Answer» C. plastic | |
| 547. |
The current flowing through an insulating medium is called |
| A. | conduction |
| B. | convection |
| C. | radiation |
| D. | susceptibility |
| Answer» C. radiation | |
| 548. |
For conductors, the free electrons will exist at |
| A. | valence band |
| B. | middle of valence and conduction band |
| C. | will not exist |
| D. | conduction band |
| Answer» E. | |
| 549. |
Alternating current measured in a transmission line will be |
| A. | peak value |
| B. | average value |
| C. | rms value |
| D. | zero |
| Answer» D. zero | |
| 550. |
The current in a metal at any frequency is due to |
| A. | conduction current |
| B. | displacement current |
| C. | both conduction and displacement current |
| D. | neither conduction nor displacement current |
| Answer» B. displacement current | |