MCQOPTIONS
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MCQOPTIONS
This section includes 216 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Electric field originates at __________ |
| A. | Positive charge |
| B. | Negative charge |
| C. | Neither positive nor negative |
| D. | Both positive and negative |
| Answer» B. Negative charge | |
| 2. |
Which is the correct expression for capacitance of a multi plate capacitor? |
| A. | C=absolute permittivity*A/d |
| B. | C=Actual permittivity*(n-1)*A/d |
| C. | C=Actual permittivity*(n)*A/d |
| D. | Actual permittivity*(n+1)*A/d |
| Answer» C. C=Actual permittivity*(n)*A/d | |
| 3. |
Calculate the relative permittivity of the second dielectric if the relative permittivity of the first is 4. The electric field strength of the first dielectric is 8V/m and that of the second is 2V/m. |
| A. | 32 |
| B. | 4 |
| C. | 16 |
| D. | 8 |
| Answer» D. 8 | |
| 4. |
The simplest kind of capacitor is ________ |
| A. | Ceramic capacitor |
| B. | Electrolyte capacitor |
| C. | Tuning capacitor |
| D. | Paper capacitor |
| Answer» E. | |
| 5. |
Leakage in capacitors is primarily caused by _________ |
| A. | Transistors |
| B. | Resistors |
| C. | Inductors |
| D. | DC motors |
| Answer» B. Resistors | |
| 6. |
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 | |
| 7. |
If the charge in a conductor is 16C and the area of cross section is 4m². Calculate the electric flux density. |
| A. | 64C/m² |
| B. | 16C/m² |
| C. | 4C/m² |
| D. | 2C/m² |
| Answer» D. 2C/m² | |
| 8. |
“Total electric flux through any closed surface is equal to the charge enclosed by that surface divided by permittivity”. This is the statement for? |
| A. | Gauss law |
| B. | Lenz law |
| C. | Coloumb’s law |
| D. | Faraday’s law |
| Answer» B. Lenz law | |
| 9. |
The unit for dielectric strength is ____________ |
| A. | V/m² |
| B. | MV/m² |
| C. | MV/m |
| D. | Vm |
| Answer» D. Vm | |
| 10. |
A CR network is one which consists of _________ |
| A. | A capacitor and resistor connected in parallel |
| B. | A capacitor and resistor connected in series |
| C. | A network consisting of a capacitor only |
| D. | A network consisting of a resistor only |
| Answer» C. A network consisting of a capacitor only | |
| 11. |
When the area of cross section of the plate increases, what happens to the force between the plates? |
| A. | Increases |
| B. | Decreases |
| C. | Remains the same |
| D. | Becomes zero |
| Answer» B. Decreases | |
| 12. |
Capacitors C1, C2 and C3 have voltage drops 2V, 3V and 5V respectively. Calculate the total voltage in the circuit. |
| A. | 10V |
| B. | 2V |
| C. | 5V |
| D. | 0V |
| Answer» B. 2V | |
| 13. |
What is the energy in a capacitor if the voltage is 5V and the charge is10C? |
| A. | 25J |
| B. | 35J |
| C. | 54J |
| D. | 55J |
| Answer» B. 35J | |
| 14. |
Calculate the capacitance if the dielectric constant=4, area of cross section= 10m² and the distance of separation between the plates is 5m. |
| A. | 7.08*10¯¹¹F |
| B. | 7.08*10¹¹F |
| C. | 7.08*10¯¹²F |
| D. | 7.08*10¯¹⁰F |
| Answer» B. 7.08*10¹¹F | |
| 15. |
What is the unit for displacement current? |
| A. | No unit |
| B. | Ampere |
| C. | Coulomb |
| D. | Ampere/coulomb |
| Answer» C. Coulomb | |
| 16. |
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 | |
| 17. |
Which capacitors relatively costly? |
| A. | Electrolyte capacitor |
| B. | Mica capacitor |
| C. | Air capacitor |
| D. | Glass capacitor |
| Answer» C. Air capacitor | |
| 18. |
A capacitor is charged to a voltage of 400V and has a resistance of 20ohm. Calculate the final value of the discharge current. |
| A. | 10A |
| B. | 0A |
| C. | Infinity |
| D. | 20A |
| Answer» E. | |
| 19. |
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 | |
| 20. |
Potential drop in a dielectric is equal to _______ |
| A. | Electric field strength*thickness |
| B. | Electric field strength*area of a cross section |
| C. | Electric field strength |
| D. | Zero |
| Answer» B. Electric field strength*area of a cross section | |
| 21. |
A metal parallel plate capacitor has 100mm diameter and the distance between the plates is 1mm. The capacitor is placed in air. Calculate the force on each plate if the potential difference between the plates is 1kV. |
| A. | 350N |
| B. | 0.035kN |
| C. | 0.035N |
| D. | 3.35kN |
| Answer» D. 3.35kN | |
| 22. |
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 | |
| 23. |
Which, among the following, will be unity in free space? |
| A. | Absolute permittivity |
| B. | Relative permittivity |
| C. | Actual permittivity |
| D. | Both absolute and relative permittivity |
| Answer» C. Actual permittivity | |
| 24. |
Find the capacitance of a multi plate capacitor whose relative permittivity=5, n=3, A=4m² and d=2m. |
| A. | 1.77*10¯¹⁰ F |
| B. | 1.77*10¹⁰ F |
| C. | 1.77*10¯¹¹ F |
| D. | 1.77*10¹¹ F |
| Answer» B. 1.77*10¹⁰ F | |
| 25. |
Gauss law is applicable for_________ |
| A. | Point charge |
| B. | Sheet charge |
| C. | Line charge |
| D. | Point, sheet and line charge |
| Answer» E. | |
| 26. |
An 8microF capacitor is connected in series with a 0.5 megaohm resistor. The DC voltage supply is 200V. Calculate the initial charging current. |
| A. | 100 microA |
| B. | 500 microA |
| C. | 400 microA |
| D. | 1000microA |
| Answer» D. 1000microA | |
| 27. |
What happens to absolute permittivity when relative permittivity increases? |
| A. | Increases |
| B. | Decreases |
| C. | Remains the same |
| D. | Becomes zero |
| Answer» D. Becomes zero | |
| 28. |
Calculate the actual permittivity of a medium whose relative permittivity is 5. |
| A. | 4.43*10¯¹¹F/m |
| B. | 4.43*10¯¹²F/m |
| C. | 4.43*10¹¹F/m |
| D. | 4.43*10¹²F/m |
| Answer» B. 4.43*10¯¹²F/m | |
| 29. |
Calculate the distance between the plates of the capacitor having C=20F, actual permittivity = 5F/m n=3 and A=4m². |
| A. | 1m |
| B. | 2m |
| C. | 3m |
| D. | 4m |
| Answer» C. 3m | |
| 30. |
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 | |
| 31. |
A metal parallel plate capacitor has ‘a’mm diameter and the distance between the plates is 1mm. The capacitor is placed in air. Force on each plate is 0.035N and the potential difference between the plates is 1kV. Find ‘a’. |
| A. | 10mm |
| B. | 100mm |
| C. | 1000m |
| D. | 1000cm |
| Answer» C. 1000m | |
| 32. |
At DC, capacitor acts as _________ |
| A. | Open circuit |
| B. | Short circuit |
| C. | Resistor |
| D. | Inductor |
| Answer» B. Short circuit | |
| 33. |
What is the initial current while charging a capacitor? |
| A. | High |
| B. | Low |
| C. | 0 |
| D. | Cannot be determined |
| Answer» B. Low | |
| 34. |
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 | |
| 35. |
What happens to the capacitance of a multi plate capacitor when the area of cross section of the plate decreases? |
| A. | Increases |
| B. | Decreases |
| C. | Remains constant |
| D. | Becomes zero |
| Answer» C. Remains constant | |
| 36. |
What is relative permittivity? |
| A. | Equal to the absolute permittivity |
| B. | Ratio of actual permittivity to absolute permittivity |
| C. | Ratio of absolute permittivity to actual permittivity |
| D. | Equal to the actual permittivity |
| Answer» C. Ratio of absolute permittivity to actual permittivity | |
| 37. |
What happens to the capacitance of a multi plate capacitor when the number of plates increases? |
| A. | Increases |
| B. | Decreases |
| C. | Remains constant |
| D. | Becomes zero |
| Answer» B. Decreases | |
| 38. |
Four 10F capacitors are connected in series, calculate the equivalent capacitance. |
| A. | 1.5F |
| B. | 2.5F |
| C. | 3.5F |
| D. | 0.5F |
| Answer» C. 3.5F | |
| 39. |
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 | |
| 40. |
A capacitor does not allow sudden changes in _________ |
| A. | Current |
| B. | Voltage |
| C. | Resistance |
| D. | Inductance |
| Answer» C. Resistance | |
| 41. |
Which among the following statements is true with regard to electric field lines? |
| A. | Electric field lines always intersect |
| B. | Electric field lines may or may not intersect |
| C. | Electric field lines can be seen |
| D. | Electric field lines never intersect |
| Answer» E. | |
| 42. |
What is the value of current in a discharging capacitive circuit if the initial current is 2A at time t=RC. |
| A. | 0.74A |
| B. | 1.26A |
| C. | 3.67A |
| D. | 2.89A |
| Answer» C. 3.67A | |
| 43. |
In which of the following mediums, will the force of attraction between the plates of a capacitor be greater? |
| A. | Air |
| B. | Water |
| C. | Does not depend on the medium |
| D. | Cannot be determined |
| Answer» C. Does not depend on the medium | |
| 44. |
The electric fields of dielectrics having the same cross sectional area in series are related to their relative permittivities in which way? |
| A. | Directly proportional |
| B. | Inversely proportional |
| C. | Equal |
| D. | Not related |
| Answer» C. Equal | |
| 45. |
In an RC series circuit, when the switch is closed and the circuit is complete, what is the response? |
| A. | Response does not vary with time |
| B. | Decays with time |
| C. | Increases with time |
| D. | First increases, then decrease |
| Answer» C. Increases with time | |
| 46. |
In uniform fields, all points have ________ field strength. |
| A. | Zero |
| B. | Same |
| C. | Infinity |
| D. | Different |
| Answer» C. Infinity | |
| 47. |
What happens to the capacitance of a multi plate capacitor when the distance of separation between the plate increases? |
| A. | Increases |
| B. | Decreases |
| C. | Remains constant |
| D. | Becomes zero |
| Answer» C. Remains constant | |
| 48. |
While discharging, what happens to the current in the capacitive circuit? |
| A. | Decreases linearly |
| B. | Increases linearly |
| C. | Decreases exponentially |
| D. | Increases exponentially |
| Answer» E. | |
| 49. |
When capacitors are connected in series ___________ remains the same. |
| A. | Voltage across each capacitor |
| B. | Charge |
| C. | Capacitance |
| D. | Resistance |
| Answer» C. Capacitance | |
| 50. |
In order to obtain a high value for capacitance, the permittivity of the dielectric medium should be? |
| A. | Low |
| B. | High |
| C. | Zero |
| D. | Unity |
| Answer» C. Zero | |