MCQOPTIONS
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MCQOPTIONS
This section includes 657 Mcqs, each offering curated multiple-choice questions to sharpen your Testing Subject knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
A condenser suitable for D.C. only is |
| A. | etallic plate variable gang condenser |
| B. | etallic paper capacitor |
| C. | il impregnated paper condenser |
| D. | oled aluminium electrolytic condenser |
| Answer» E. | |
| 2. |
An electrolytic capacitor is generally made to provide |
| A. | ow capacitance |
| B. | ixed capacitance |
| C. | ariable capacitance |
| D. | arge value of capacitance |
| Answer» E. | |
| 3. |
Air capacitors are generally available in the range |
| A. | 0 to 400 pF |
| B. | to 20 pF |
| C. | 00 to 900 pF |
| D. | 0 to 100 pF |
| Answer» B. to 20 pF | |
| 4. |
A capacitor in a circuit became hot and ultimately exploded due to wrong connections, which type of capacitor it could be ? |
| A. | aper capacitor |
| B. | eramic capacitor |
| C. | lectrolytic capacitor |
| D. | ny-of the above |
| Answer» D. ny-of the above | |
| 5. |
Which of the following capacitors can be used for temperature compensation ? |
| A. | ir capacitor |
| B. | eramic capacitor |
| C. | aper capacitor |
| D. | one of the above |
| Answer» C. aper capacitor | |
| 6. |
Which of the following capacitors is marked for polarity ? |
| A. | ir |
| B. | aper |
| C. | ica |
| D. | lectrolytic |
| Answer» E. | |
| 7. |
The breakdown voltage for paper capacitors is usually |
| A. | 0 to 60 volts |
| B. | 00 to 1600 volts |
| C. | 000 to 3000 volts |
| D. | ore than 10000 volts |
| Answer» C. 000 to 3000 volts | |
| 8. |
For closer tolerances which of the following capacitors is usually preferred ? |
| A. | aper capacitor |
| B. | ica capacitor |
| C. | eramic disc capacitor |
| D. | one of the above |
| Answer» C. eramic disc capacitor | |
| 9. |
The ability of charged bodies to exert force on 6ne another is attributed to the existence of |
| A. | lectrons |
| B. | rotons |
| C. | eutrons |
| D. | lectric field |
| Answer» E. | |
| 10. |
If an ohmmeter reading immediately goes practically to zero and stays there, capacitor is |
| A. | harged |
| B. | hort-circuited |
| C. | ossy |
| D. | atisfactory |
| Answer» C. ossy | |
| 11. |
In a capacitive circuit |
| A. | steady value of applied voltage causes discharge |
| B. | n increase in applied voltage makes a capacitor charge |
| C. | ecrease in applied voltage makes a capacitor charge |
| D. | one of the above |
| Answer» C. ecrease in applied voltage makes a capacitor charge | |
| 12. |
A capacitor stores 0.24 coulombs at 10 volts. Its capacitance is |
| A. | .024 F |
| B. | .12 F |
| C. | .6 F |
| D. | .8 F |
| Answer» B. .12 F | |
| 13. |
A charge which when placed in vacuum from an equal and similar charge repels with a force of 9 x 103 N, is known as |
| A. | illi-coulomb |
| B. | icro-coulomb |
| C. | ico-coulomb |
| D. | oulomb |
| Answer» C. ico-coulomb | |
| 14. |
Dielectric strength of mica is |
| A. | 0 to 20 kV/mm |
| B. | 0 to 50 kV/mm |
| C. | 0 to 200 kV/mm |
| D. | 00 to 500 kV/mm |
| Answer» D. 00 to 500 kV/mm | |
| 15. |
Dielectric strength of a material depends on |
| A. | oisture content |
| B. | emperature |
| C. | hickness |
| D. | ll of the above |
| Answer» E. | |
| 16. |
Electric displacement is a______quantity. |
| A. | calar |
| B. | ector |
| C. | oth of the above |
| D. | one of the above |
| Answer» C. oth of the above | |
| 17. |
Which of the following material has least value of dielectric constant ? |
| A. | eramics |
| B. | il |
| C. | lass |
| D. | aper |
| Answer» C. lass | |
| 18. |
Voltage applied across a ceramic dielectric produces an electrolytic field 100 times greater than air. What will be the value of dielectric constant ? |
| A. | 0 |
| B. | 00 |
| C. | 50 |
| D. | 00 |
| Answer» C. 50 | |
| 19. |
In order to remove static electricity from machinery |
| A. | onstruct insulated cabins |
| B. | nsulate the machinery |
| C. | round the framework |
| D. | umidify the surroundings |
| Answer» D. umidify the surroundings | |
| 20. |
Paper capacitors usually have a tolerance of |
| A. | 5% |
| B. | 10% |
| C. | 15% |
| D. | 20% |
| Answer» C. 15% | |
| 21. |
A gang condenser is a |
| A. | olarised capacitor |
| B. | ariable capacitor |
| C. | eramic capacitor |
| D. | one of the above |
| Answer» C. eramic capacitor | |
| 22. |
A region around a stationary electric charge has |
| A. | n electric field |
| B. | magnetic field |
| C. | oth (A) and (B) |
| D. | one of the above |
| Answer» B. magnetic field | |
| 23. |
The lines of force due to charged particles are |
| A. | lways straight |
| B. | lways curved |
| C. | ometimes curved |
| D. | one of the above |
| Answer» C. ometimes curved | |
| 24. |
The phenomenon of an uncharged body getting charged merely by the nearness of a charged body is known as |
| A. | hotoelectric effect |
| B. | hemical effect |
| C. | agnetic effect |
| D. | nduction |
| Answer» E. | |
| 25. |
Which of the following capacitors preferred for high frequency circuits ? |
| A. | ir capacitor |
| B. | lectrolytic capacitor |
| C. | ica capacitor |
| D. | one of the above |
| Answer» D. one of the above | |
| 26. |
The potential gradient across the material of low permittivity is than across the material of high permittivity. |
| A. | maller |
| B. | reater |
| C. | oth (A) and (B) |
| D. | one of the above |
| Answer» C. oth (A) and (B) | |
| 27. |
The time constant of an R-C circuit is defined as the time during which capacitor charging voltage actually rises to ______ percent of its value. |
| A. | 7, initial |
| B. | 2, initial |
| C. | 2, final |
| D. | 7, final |
| Answer» D. 7, final | |
| 28. |
Electric field intensity is a quantity |
| A. | calar |
| B. | ector |
| C. | oth (A) and (B) |
| D. | one of the above |
| Answer» C. oth (A) and (B) | |
| 29. |
What will happen to an insulating medium if voltage more than the breakdown voltage is applied on it ? |
| A. | t will become magnetic |
| B. | t will melt |
| C. | t will get punctured or cracked |
| D. | ts molecular structure will get changed |
| Answer» D. ts molecular structure will get changed | |
| 30. |
The units of volume charge density are |
| A. | oulomb/meter |
| B. | oulomb/meter |
| C. | oulomb/meter |
| D. | oulomb/meter |
| Answer» D. oulomb/meter | |
| 31. |
The sparking between two electrical contacts can be reduced by inserting a |
| A. | apacitor in parallel with contacts |
| B. | apacitor in series with each contact |
| C. | esistance in line |
| D. | one of the above |
| Answer» B. apacitor in series with each contact | |
| 32. |
The presence of an uncharged conductor near a charged one increases the |
| A. | harge of the charged conductor |
| B. | apacity of the charged conductor |
| C. | otential of the charged conductor |
| D. | ll of the above |
| Answer» C. otential of the charged conductor | |
| 33. |
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. | oltage across the plates increases |
| B. | oltage across the plates decreases |
| C. | harge on the capacitor decreases |
| D. | harge on the capacitor increases |
| Answer» C. harge on the capacitor decreases | |
| 34. |
capacitors can be used only for D.C. |
| A. | ir |
| B. | aper |
| C. | ica |
| D. | lectrolytic |
| Answer» E. | |
| 35. |
A capacitor charged to 200 V has 2000 (iC of charge. The value of capacitance will be |
| A. | 0 F |
| B. | 0 uF |
| C. | 00 nF |
| D. | 000 uF |
| Answer» C. 00 nF | |
| 36. |
Which of the following capacitors will have the least value of breakdown voltage ? |
| A. | ica |
| B. | aper |
| C. | eramic |
| D. | lectrolytic |
| Answer» E. | |
| 37. |
When a dielectric slab is introduced in a parallel plate capacitor, the potential difference between plates will |
| A. | emain uncharged |
| B. | ecrease |
| C. | ncrease |
| D. | ecome zero |
| Answer» C. ncrease | |
| 38. |
The power dissipated in a pure capacitor is |
| A. | ero |
| B. | roportional to applied voltage |
| C. | roportional to value of capacitance |
| D. | oth (B) and (C) above |
| Answer» B. roportional to applied voltage | |