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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 | |