MCQOPTIONS
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MCQOPTIONS
This section includes 152 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering Questions knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
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 | |
| 2. |
Which one of the following can be taken as the measure of electric intensity ? |
| A. | F/A |
| B. | V/A |
| C. | VF/A |
| D. | q/VA |
| Answer» C. VF/A | |
| 3. |
While testing a capacitor with ohm meter, if the capacitor shows charging, but the final resistance reading is appreciably less than normal, it can be concluded that the capacitor is____________? |
| A. | short-circuited |
| B. | open circuited |
| C. | alright |
| D. | leaky |
| Answer» E. | |
| 4. |
Which of the following statements is correct ___________? |
| A. | Air capacitors have a black band to indicate the outside foil |
| B. | Electrolytic capacitor must be connected in the correct polarity |
| C. | Ceramic capacitors must be connected in the correct polarity |
| D. | Mica capacitors are available in capacitance value of 1 to 10 pF |
| Answer» C. Ceramic capacitors must be connected in the correct polarity | |
| 5. |
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 | |
| 6. |
Which of the following materials has the highest value of dielectric constant___________? |
| A. | Glass |
| B. | Vacuum |
| C. | Ceramics |
| D. | Oil |
| Answer» E. | |
| 7. |
Which of the following is not a vector ___________? |
| A. | Linear momentum |
| B. | Angular momentum |
| C. | Electric field |
| D. | Electric potential |
| Answer» C. Electric field | |
| 8. |
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 | |
| 9. |
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 | |
| 10. |
Which of the following capacitors will have the least value of breakdown voltage________ ? |
| A. | Mica |
| B. | Paper |
| C. | Ceramic |
| D. | Electrolytic |
| Answer» E. | |
| 11. |
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 | |
| 12. |
Which medium has the least dielectric strength ____________? |
| A. | Paraffin wax |
| B. | Quartz |
| C. | Glass |
| D. | Air |
| Answer» E. | |
| 13. |
Which capacitor will be physically smaller for the same ratings ___________? |
| A. | Ceramic capacitor |
| B. | Paper capacitor |
| C. | Both will be of equal size |
| D. | None of the above |
| Answer» B. Paper capacitor | |
| 14. |
When we rub a glass rod with a silk cloth then________________? |
| A. | glass rod acquires negative charge while silk acquires positive charge |
| B. | glass rod acquires positive charge while silk acquires negative charges |
| C. | both glass rod and silk acquire negative charge |
| D. | both glass rod and silk acquire positive charge |
| Answer» C. both glass rod and silk acquire negative charge | |
| 15. |
When the dielectric is homogeneous,the potential gradient is_____________? |
| A. | uniform |
| B. | non-uniform |
| C. | zero |
| D. | any of the above |
| Answer» B. non-uniform | |
| 16. |
When a dielectric is placed in an electric field the field strength____________? |
| A. | decreases |
| B. | increases |
| C. | reduces to zero |
| D. | remain unchanged |
| Answer» B. increases | |
| 17. |
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 | |
| 18. |
When 4 volts e.m.f. is applied across a 1 farad capacitor, it will store energy of_____________? |
| A. | 2 joules |
| B. | 4 joules |
| C. | 6 joules |
| D. | 8 joules |
| Answer» E. | |
| 19. |
What will happen to an insulating medium if voltage more than the breakdown voltage is applied on it__________ ? |
| A. | It will become magnetic |
| B. | It will melt |
| C. | It will get punctured or cracked |
| D. | Its molecular structure will get changed |
| Answer» D. Its molecular structure will get changed | |
| 20. |
Voltage applied across a ceramic dielectric produces an electrolytic field 100 times greater than air. What will be the value of dielectric constant ________? |
| A. | 50 |
| B. | 100 |
| C. | 150 |
| D. | 200 |
| Answer» C. 150 | |
| 21. |
Value of εr for various dielectrics is always________________? |
| A. | Less than unity |
| B. | Equal to the unit |
| C. | Larger than unit |
| D. | No hard and fast rule |
| Answer» D. No hard and fast rule | |
| 22. |
Two similar charges each of one coulomb placed in air one meter apart repel each other with a force______________? |
| A. | 9 x 109N |
| B. | 9.2 x 104N |
| C. | 9 x 109N |
| D. | 9 x 107N |
| Answer» B. 9.2 x 104N | |
| 23. |
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 | |
| 24. |
Two oppositely charged balls A and B attract third conducting ball C when placed near them turn by turn. Then ball C must be______________? |
| A. | positively charged |
| B. | electrically neutral |
| C. | negatively charged |
| D. | positively and negatively charged |
| Answer» C. negatively charged | |
| 25. |
Two infinite parallel plates 10 mm apart have maintained between them a potential difference of 100 V. The acceleration of an electron placed between them is______________? |
| A. | 0.56 x 1015 m/s2 |
| B. | 1.5 x 1015 m/s2 |
| C. | 1.6 x 1015 m/s2 |
| D. | 1.76 x 1015 m/s2 |
| Answer» E. | |
| 26. |
Two charges are placed at a certain distance. If the magnitude of each charge is doubled the force will become_____________? |
| A. | 1/4th of its original value |
| B. | 1/8th of its original value |
| C. | 4 times of its original value |
| D. | 8 times of its original value |
| Answer» D. 8 times of its original value | |
| 27. |
To prevent the generation of static charges on rubber or flat leather__________? |
| A. | surface is moistened |
| B. | conductive dressing is done |
| C. | oil compound dressing is done |
| D. | talcum powder is sprayed on the surface |
| Answer» C. oil compound dressing is done | |
| 28. |
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 | |
| 29. |
The value of the capacitance depends upon the________________? |
| A. | voltage applied |
| B. | thickness of the capacitor plates |
| C. | geometry of the capacitor |
| D. | dinsity of the capacitor plates |
| Answer» D. dinsity of the capacitor plates | |
| 30. |
The value of E within the field due to a point charge can be found with the help of___________? |
| A. | Faraday’s laws |
| B. | Kirchhoff s laws |
| C. | Coulomb’s laws |
| D. | none of the above |
| Answer» D. none of the above | |
| 31. |
The value of dielectric constant for vacuum is taken as____________? |
| A. | zero |
| B. | 1 |
| C. | 4 |
| D. | 10 |
| Answer» C. 4 | |
| 32. |
The units of volume charge density are___________? |
| A. | Coulomb/meter |
| B. | Coulomb/meter |
| C. | Coulomb/meter |
| D. | Coulomb/meter |
| Answer» D. Coulomb/meter | |
| 33. |
The units of capacitance are____________? |
| A. | volts/coulomb |
| B. | coulombs/volt |
| C. | ohms |
| D. | henry/Wb |
| Answer» C. ohms | |
| 34. |
The unit of dielectric strength is given by___________? |
| A. | V/m |
| B. | V2/m |
| C. | m/V |
| D. | m/V2 |
| Answer» B. V2/m | |
| 35. |
The unit of capacitance is__________? |
| A. | henry |
| B. | ohm |
| C. | farad |
| D. | farad/m |
| Answer» D. farad/m | |
| 36. |
“The total electric flux through any closed surface surrounding charges is equal to the amount oflcharge enclosed”. The above statement is associated with____________? |
| A. | Coulomb’s square law |
| B. | Gauss’s law |
| C. | Maxwell’s first law |
| D. | Maxwell’s second law |
| Answer» C. Maxwell’s first law | |
| 37. |
The total deficiency or excess of electrons in a body is known as____________? |
| A. | current |
| B. | voltage |
| C. | potential gradient |
| D. | charge |
| Answer» E. | |
| 38. |
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. | 37, initial |
| B. | 62, initial |
| C. | 62, final |
| D. | 37, final |
| Answer» D. 37, final | |
| 39. |
The time constant and R-C circuit may also be defined as the time during which the charging current falls to ________ percent of its initial maximum value |
| A. | 37 |
| B. | 42 |
| C. | 63 |
| D. | 73 |
| Answer» B. 42 | |
| 40. |
“The surface integral of the normal component of the electric displacement D over any closed surface equals the charge enclosed by the surface”. The above statement is associated with_______? |
| A. | Gauss’s law |
| B. | Kirchhoff s law |
| C. | Faraday’s law |
| D. | Lenz’s law |
| Answer» B. Kirchhoff s law | |
| 41. |
The sparking between two electrical contacts can be reduced by inserting a___________? |
| A. | capacitor in parallel with contacts |
| B. | capacitor in series with each contact |
| C. | resistance in line |
| D. | none of the above |
| Answer» B. capacitor in series with each contact | |
| 42. |
The relative permittivity of free space is given by__________? |
| A. | 1 |
| B. | 10 |
| C. | 100 |
| D. | 1000 |
| Answer» B. 10 | |
| 43. |
The relative permittivity has the following units__________? |
| A. | F/m |
| B. | m/F |
| C. | Wb/m |
| D. | no units |
| Answer» D. no units | |
| 44. |
The property of a capacitor to store electricity is called its____________? |
| A. | capacitance |
| B. | charge |
| C. | energy |
| D. | none of the above |
| Answer» B. charge | |
| 45. |
The presence of an uncharged conductor near a charged one increases the__________? |
| A. | charge of the charged conductor |
| B. | capacity of the charged conductor |
| C. | potential of the charged conductor |
| D. | all of the above |
| Answer» C. potential of the charged conductor | |
| 46. |
The power dissipated in a pure capacitor is______________? |
| A. | zero |
| B. | proportional to applied voltage |
| C. | proportional to value of capacitance |
| D. | both (B) and (C) above |
| Answer» B. proportional to applied voltage | |
| 47. |
The potential gradient across the material of low permittivity is than across the material of high permittivity? |
| A. | smaller |
| B. | greater |
| C. | both (A) and (B) |
| D. | none of the above |
| Answer» C. both (A) and (B) | |
| 48. |
The phenomenon of an uncharged body getting charged merely by the nearness of a charged body is known as____________? |
| A. | pholoelectric effect |
| B. | chemical effect |
| C. | magnetic effect |
| D. | induction |
| Answer» E. | |
| 49. |
The ohmmeter reading for a short circuited capacitor is____________? |
| A. | infinity |
| B. | few kilo ohms |
| C. | few megohms |
| D. | zero |
| Answer» E. | |
| 50. |
The number of Faraday tubes of flux passing through a surface in an electric field is called____________? |
| A. | electric flux |
| B. | electric flux density |
| C. | magnetic flux density |
| D. | electric charge density |
| Answer» B. electric flux density | |