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. |
While discharging, what happens to the voltage in the capacitive circuit? |
| A. | Decreases linearly |
| B. | Increases linearly |
| C. | Decreases exponentially |
| D. | Increases exponentially |
| Answer» D. Increases exponentially | |
| 2. |
What is the value of current in a charging 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» B. 1.26A | |
| 3. |
What happens to the potential difference between the plates of a capacitor as the thickness of the dielectric slab increases? |
| A. | Increases |
| B. | Decreases |
| C. | Remains the same |
| D. | Becomes zero |
| Answer» C. Remains the same | |
| 4. |
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 | |
| 5. |
A dielectric is basically a ________ |
| A. | Capacitor |
| B. | Conductor |
| C. | Insulator |
| D. | Semiconductor |
| Answer» D. Semiconductor | |
| 6. |
What is the final current while charging a capacitor? |
| A. | High |
| B. | Zero |
| C. | Infinity |
| D. | Low |
| Answer» C. Infinity | |
| 7. |
Which of the following depends on charging and discharging rate of a capacitor? |
| A. | Time constant |
| B. | Current |
| C. | Power |
| D. | Voltage |
| Answer» B. Current | |
| 8. |
A capacitor is charged to a voltage of 400V and has a resistance of 20ohm. Calculate the initial value of the discharge current. |
| A. | 10A |
| B. | 0A |
| C. | Infinity |
| D. | 20A |
| Answer» C. Infinity | |
| 9. |
The charging time constant of a circuit consisting of a capacitor is the time taken for the charge in the capacitor to become __________ % of the initial charge. |
| A. | 33 |
| B. | 63 |
| C. | 37 |
| D. | 36 |
| Answer» C. 37 | |
| 10. |
A capacitor is charged to a voltage of 400V and has a resistance of 20ohm. Calculate the final value of charging current. |
| A. | 10A |
| B. | 0A |
| C. | Infinity |
| D. | 20A |
| Answer» C. Infinity | |
| 11. |
An 8microF capacitor is connected in series with a 0.5 megaohm resistor. The DC voltage supply is 200V. Calculate the current in the capacitor 4s after the power is supplied. |
| A. | 79 microA |
| B. | 68 microA |
| C. | 48 microA |
| D. | 74 microA |
| Answer» E. | |
| 12. |
The expression for the current in an RC circuit is? |
| A. | i=(V/R)et/RC |
| B. | i=(V/R)e-t/RC |
| C. | i=(V/R)(1-e-t/RC) |
| D. | i=(V/R) (1-et/RC) |
| Answer» C. i=(V/R)(1-e-t/RC) | |
| 13. |
A 8 microF capacitor is connected in series with a 0.5 megaohm resistor. The DC voltage supply is 200V. Calculate the time taken for the potential difference across the capacitor to grow to 160V. |
| A. | 6.93s |
| B. | 7.77s |
| C. | 2.33s |
| D. | 3.22s |
| Answer» B. 7.77s | |
| 14. |
If 2V is supplied to a 3F capacitor, calculate the charge stored in the capacitor. |
| A. | 1.5C |
| B. | 6C |
| C. | 2C |
| D. | 3C |
| Answer» C. 2C | |
| 15. |
______________ capacitors have a high leakage voltage. |
| A. | Electrolyte capacitor |
| B. | Variable capacitor |
| C. | Air capacitor |
| D. | Polyester capacitor |
| Answer» E. | |
| 16. |
____________ capacitors usually have a colour code to find its value. |
| A. | Electrolyte capacitor |
| B. | Variable capacitor |
| C. | Polyester capacitor |
| D. | Glass capacitor |
| Answer» D. Glass capacitor | |