MCQOPTIONS
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MCQOPTIONS
This section includes 40 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. |
What is the value of impedance at resonance? |
| A. | XL |
| B. | XC |
| C. | R |
| D. | 0 |
| Answer» D. 0 | |
| 2. |
What is the resonance frequency of ac circuit? |
| A. | 1/vLC |
| B. | v(L/C) |
| C. | vLC |
| D. | LC |
| Answer» B. v(L/C) | |
| 3. |
Can capacitor fully charge using alternating current? |
| A. | yes |
| B. | no |
| C. | may or may not |
| D. | depend on value of capacitance |
| Answer» B. no | |
| 4. |
What is tan? for RC circuit? |
| A. | XC/R |
| B. | XL/R |
| C. | R/Z |
| D. | Z/R |
| Answer» B. XL/R | |
| 5. |
What is the frequency in resonance condition? |
| A. | Minimum |
| B. | Maximum |
| C. | Cannot be determined |
| D. | Zero |
| Answer» C. Cannot be determined | |
| 6. |
What is the resistance offered by a capacitor? |
| A. | Susceptance |
| B. | Conductance |
| C. | Admittance |
| D. | Reactance |
| Answer» E. | |
| 7. |
What is sin? from impedance triangle? |
| A. | XL/R |
| B. | XL/Z |
| C. | R/Z |
| D. | Z/R |
| Answer» C. R/Z | |
| 8. |
What is the resonance condition? |
| A. | When XL>XC |
| B. | When XL<XC |
| C. | When XL=XC |
| D. | When XC=infinity |
| Answer» D. When XC=infinity | |
| 9. |
The combination of resistance and reactance known as ___________ |
| A. | Susceptance |
| B. | Impedance |
| C. | Conductance |
| D. | Admittance |
| Answer» C. Conductance | |
| 10. |
What is impedance at resonance? |
| A. | maximum |
| B. | minimum |
| C. | zero |
| D. | cannot be determined |
| Answer» C. zero | |
| 11. |
What is f in terms of voltage? |
| A. | f=cos-1V/VR |
| B. | f=cos-1V*VR |
| C. | f=cos-1VR/V |
| D. | f=tan-1V/VR |
| Answer» D. f=tan-1V/VR | |
| 12. |
Which, among the following, is the correct expression for f. |
| A. | f=tan-1 (XL/R) |
| B. | f=tan-1 (R/XL) |
| C. | f=tan-1 (XL*R) |
| D. | f=cos-1 (XL/R) |
| Answer» B. f=tan-1 (R/XL) | |
| 13. |
In which device inductor cannot be used? |
| A. | filter circuit |
| B. | transformer |
| C. | choke |
| D. | dielectric |
| Answer» E. | |
| 14. |
In an inductive circuit, the current________ the voltage? |
| A. | Leads |
| B. | Lags |
| C. | Is greater than |
| D. | Is less than |
| Answer» C. Is greater than | |
| 15. |
A resistance of 7 ohm is connected in series with an inductance of 31.8mH. The circuit is connected to a 100V 50Hz sinusoidal supply. Calculate the voltage across the inductor. |
| A. | 52V |
| B. | 82V |
| C. | 65V |
| D. | 76V |
| Answer» C. 65V | |
| 16. |
A resistance of 7 ohm is connected in series with an inductance of 31.8mH. The circuit is connected to a 100V 50Hz sinusoidal supply. Calculate the voltage across the resistor. |
| A. | 31.8V |
| B. | 57.4V |
| C. | 67.3V |
| D. | 78.2V |
| Answer» C. 67.3V | |
| 17. |
The correct expression for the instantaneous current if instantaneous voltage is Vm(sint) in a resistive circuit is? |
| A. | 1A |
| B. | 2A |
| C. | 3A |
| D. | 4A |
| Answer» C. 3A | |
| 18. |
The correct expression for the instantaneous current if instantaneous voltage is Vm(sint) in an inductive circuit is? |
| A. | i = Vm(sint)/XL |
| B. | i = Vm(cost)/XL |
| C. | i = -Vm(sint)/XL |
| D. | i = -Vm(cost)/XL |
| Answer» E. | |
| 19. |
What is the current in an inductive circuit when the applied voltage is maximum? |
| A. | Infinity |
| B. | Maximum |
| C. | Zero |
| D. | Cannot be determined |
| Answer» D. Cannot be determined | |
| 20. |
In an inductive circuit, the voltage_______ the current? |
| A. | Leads |
| B. | Lags |
| C. | Is greater than |
| D. | Is less than |
| Answer» B. Lags | |
| 21. |
Choke involve use of _____________ |
| A. | Resistor |
| B. | Capacitor |
| C. | Inductor |
| D. | Transistor |
| Answer» D. Transistor | |
| 22. |
Inductor does not allow sudden changes in? |
| A. | Voltage |
| B. | Current |
| C. | Resistance |
| D. | Inductance |
| Answer» C. Resistance | |
| 23. |
Inductance is _____________________ to number of turns in the coil. |
| A. | directly proportional |
| B. | inversely proportional |
| C. | equal |
| D. | not related |
| Answer» B. inversely proportional | |
| 24. |
What is the value of current in an inductive circuit when there is no applied voltage? |
| A. | Minimum |
| B. | Maximum |
| C. | Zero |
| D. | Cannot be determined |
| Answer» C. Zero | |
| 25. |
Instantaneous voltage is the product of resistance and _____________ current in a resistive circuit. |
| A. | Instantaneous |
| B. | Average |
| C. | RMS |
| D. | Peak |
| Answer» B. Average | |
| 26. |
If in an alternating current circuit, capacitance of 30 µF is connected to a supply of 200V,50Hz. Find the current in the circuit. |
| A. | 1.38 A |
| B. | 1.89 A |
| C. | 1.74 A |
| D. | 0.89 A |
| Answer» B. 1.89 A | |
| 27. |
In ac circuit, resistance 5 ohm is connected with capacitor having capacitive reactance 12 ohm. Supply of 260 V is connected to the circuit. Calculate the current in the circuit. |
| A. | 40 A |
| B. | 10 A |
| C. | 20 A |
| D. | 30 A |
| Answer» D. 30 A | |
| 28. |
If in an alternating current circuit, impedance is 26 ohm, capacitive reactance is 24 ohm, what is the resistance? |
| A. | 25 ohm |
| B. | 10 ohm |
| C. | 12 ohm |
| D. | 23 ohm |
| Answer» C. 12 ohm | |
| 29. |
In ac circuit, resistance 5 ohm is connected with capacitor having capacitive reactance 12 ohm. Supply of 260 V is connected to the circuit. Calculate the voltage across resistance. |
| A. | 300 V |
| B. | 200 V |
| C. | 240 V |
| D. | 100 V |
| Answer» E. | |
| 30. |
What is imaginary part of the impedance of RLC circuit? |
| A. | Resistance |
| B. | Conductance |
| C. | Admittance |
| D. | Reactance |
| Answer» E. | |
| 31. |
If in an alternating current circuit, resistance is 5 ohm, capacitive reactance is 12 ohm, what is the impedance? |
| A. | 5 ohm |
| B. | 10 ohm |
| C. | 12 ohm |
| D. | 13 ohm |
| Answer» E. | |
| 32. |
Which type of current can be stored in a capacitor? |
| A. | Alternating current |
| B. | Direct current |
| C. | Both alternating current and direct current |
| D. | Neither alternating current nor direct current |
| Answer» C. Both alternating current and direct current | |
| 33. |
What is the real part of the impedance of RLC circuit? |
| A. | Resistance |
| B. | Conductance |
| C. | Admittance |
| D. | Reactance |
| Answer» B. Conductance | |
| 34. |
What is the relation between reactance, resistance and impedance? |
| A. | Z=R+jX |
| B. | Z=R+X |
| C. | Z=R-X |
| D. | Z=R-jX |
| Answer» B. Z=R+X | |
| 35. |
If in an alternating current circuit, capacitance C is connected to a supply of 200V,50Hz. Current in the circuit is 1.89 A. Find the capacitance C. |
| A. | 30 µF |
| B. | 20 µF |
| C. | 10 µF |
| D. | 15 µF |
| Answer» B. 20 µF | |
| 36. |
Which of the following is not ac waveform? |
| A. | sinusoidal |
| B. | square |
| C. | constant |
| D. | triangular |
| Answer» D. triangular | |
| 37. |
When is tanf negative? |
| A. | When inductive reactance is less than capacitive reactance |
| B. | When inductive reactance is greater than capacitive reactance |
| C. | When inductive reactance is equal to capacitive reactance |
| D. | When inductive reactance is zero |
| Answer» B. When inductive reactance is greater than capacitive reactance | |
| 38. |
In ac circuit, resistance 5 ohm is connected with a capacitor having capacitive reactance 12 ohm. Supply of 260 V is connected to the circuit. Calculate the voltage across a capacitor. |
| A. | 300 V |
| B. | 200 V |
| C. | 240 V |
| D. | 100 V |
| Answer» D. 100 V | |
| 39. |
What is not a frequency for ac current? |
| A. | 50 Hz |
| B. | 55 Hz |
| C. | 0Hz |
| D. | 60 Hz |
| Answer» D. 60 Hz | |
| 40. |
When is tanf positive? |
| A. | When inductive reactance is less than capacitive reactance |
| B. | When inductive reactance is greater than capacitive reactance |
| C. | When inductive reactance is equal to capacitive reactance |
| D. | When inductive reactance is zero |
| Answer» C. When inductive reactance is equal to capacitive reactance | |