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. |
A triac is equivalent to two SCRs ___________.%! |
| A. | In parallel |
| B. | In series |
| C. | In inverse-parallel |
| D. | None of the above |
| Answer» D. None of the above | |
| 2. |
The triac is ___________.%! |
| A. | Like a bidirectional SCR |
| B. | A four-terminal device |
| C. | Not a thyristor |
| D. | None of the above |
| Answer» B. A four-terminal device | |
| 3. |
When a UJT is turned ON, the resistance between emitter terminal and lower base terminal ___________%! |
| A. | Remains the same |
| B. | Is decreased |
| C. | Is increased |
| D. | None of the above |
| Answer» C. Is increased | |
| 4. |
When the emitter terminal of a UJT is open, the resistance between the base terminal is generally ___________.%! |
| A. | High |
| B. | Low |
| C. | Extremely low |
| D. | None of the above |
| Answer» B. Low | |
| 5. |
After peak point, the UJT operates in the ___________ region.%! |
| A. | Cut-off |
| B. | Saturation |
| C. | Negative resistance |
| D. | None of the above |
| Answer» D. None of the above | |
| 6. |
A triac has ___________ semiconductor layers.%! |
| A. | Two |
| B. | Three |
| C. | Four |
| D. | Five |
| Answer» D. Five | |
| 7. |
A Triac has three terminals viz ___________%! |
| A. | Drain, source, gate |
| B. | Two main terminal and a gate terminal |
| C. | Cathode, anode, gate |
| D. | None of the above |
| Answer» C. Cathode, anode, gate | |
| 8. |
*$_After peak point, the UJT operates in the ___________ region.? |
| A. | Cut-off |
| B. | Saturation |
| C. | Negative resistance |
| D. | None of the above |
| Answer» D. None of the above | |
| 9. |
*$_When the emitter terminal of a UJT is open, the resistance between the base terminal is generally ___________.? |
| A. | High |
| B. | Low |
| C. | Extremely low |
| D. | None of the above |
| Answer» B. Low | |
| 10. |
*$_A Triac has three terminals viz ___________? |
| A. | Drain, source, gate |
| B. | Two main terminal and a gate terminal |
| C. | Cathode, anode, gate |
| D. | None of the above |
| Answer» C. Cathode, anode, gate | |
| 11. |
*$_A triac has ___________ semiconductor layers.? |
| A. | Two |
| B. | Three |
| C. | Four |
| D. | Five |
| Answer» D. Five | |
| 12. |
*$_A triac is a ___________ switch? |
| A. | Bidirectional |
| B. | Unidirectional |
| C. | Mechanical |
| D. | None of the above |
| Answer» B. Unidirectional | |
| 13. |
*/*_The device that exhibits negative resistance region is ___________.? |
| A. | Diac |
| B. | Triac |
| C. | Transistor |
| D. | UJT |
| Answer» E. | |
| 14. |
*/*_Between the peak point and the valley point of UJT emitter characteristics we have ___________ region? |
| A. | Saturation |
| B. | Negative resistance |
| C. | Cut-off |
| D. | None of the above |
| Answer» C. Cut-off | |
| 15. |
*/*_A diac is simply ___________.? |
| A. | A single junction device |
| B. | A three junction device |
| C. | A triac without gate terminal |
| D. | None of the above |
| Answer» D. None of the above | |
| 16. |
*/*_The V-I characteristics for a triac in the first and third quadrants are essentially identical to those of ___________ in its first quadrant? |
| A. | Transistor |
| B. | SCR |
| C. | UJT |
| D. | none of the above |
| Answer» C. UJT | |
| 17. |
_ Between the peak point and the valley point of UJT emitter characteristics we have ___________ region$? |
| A. | Saturation |
| B. | Negative resistance |
| C. | Cut-off |
| D. | None of the above |
| Answer» C. Cut-off | |
| 18. |
_ The device that exhibits negative resistance region is ___________.$? |
| A. | Diac |
| B. | Triac |
| C. | Transistor |
| D. | UJT |
| Answer» E. | |
| 19. |
_ The V-I characteristics for a triac in the first and third quadrants are essentially identical to those of ___________ in its first quadrant$? |
| A. | Transistor |
| B. | SCR |
| C. | UJT |
| D. | none of the above |
| Answer» C. UJT | |
| 20. |
_ A diac is simply ___________.$? |
| A. | A single junction device |
| B. | A three junction device |
| C. | A triac without gate terminal |
| D. | None of the above |
| Answer» D. None of the above | |
| 21. |
_ A diac has ___________ terminals.$? |
| A. | Two |
| B. | Three |
| C. | Four |
| D. | None of the above |
| Answer» B. Three | |
| 22. |
_A triac can pass a portion of ___________ half-cycle through the load.$? |
| A. | Only positive |
| B. | Only negative |
| C. | Both positive and negative |
| D. | None of the above |
| Answer» D. None of the above | |
| 23. |
_A diac is turned on by ___________.$? |
| A. | A breakover voltage |
| B. | Gate voltage |
| C. | Gate current |
| D. | None of the above |
| Answer» B. Gate voltage | |
| 24. |
_The device that does not have the gate terminal is ___________.$? |
| A. | Triac |
| B. | FET |
| C. | SCR |
| D. | Diac |
| Answer» E. | |
| 25. |
_A diac is ___________ switch$? |
| A. | An c. |
| B. | A d.c. |
| C. | A mechanical |
| D. | None of the above |
| Answer» B. A d.c. | |
| 26. |
_A diac has ___________ pn junctions$? |
| A. | Four |
| B. | Two |
| C. | Three |
| D. | None of the above |
| Answer» C. Three | |
| 27. |
A UJT is sometimes called ___________ diode.$? |
| A. | Low resistance |
| B. | High resistance |
| C. | Single-base |
| D. | Double-base |
| Answer» E. | |
| 28. |
Which of the following is not a characteristic of UJT?$? |
| A. | Intrinsic stand off ratio |
| B. | Negative resistance |
| C. | Peak-point voltage |
| D. | Bilateral conduction |
| Answer» E. | |
| 29. |
Power electronics essentially deals with control of a.c. power at ___________.$? |
| A. | Frequencies above 20 kHz |
| B. | Frequencies above 1000 kHz |
| C. | Frequencies less than 10 Hz |
| D. | 50 Hz frequency |
| Answer» E. | |
| 30. |
In a UJT, the p-type emitter is ___________ doped$? |
| A. | Lightly |
| B. | Heavily |
| C. | Moderately |
| D. | None of the above |
| Answer» C. Moderately | |
| 31. |
Which of the following is not a characteristic of UJT?? |
| A. | Intrinsic stand off ratio |
| B. | Negative resistance |
| C. | Peak-point voltage |
| D. | Bilateral conduction |
| Answer» E. | |
| 32. |
A UJT is sometimes called ___________ diode.? |
| A. | Low resistance |
| B. | High resistance |
| C. | Single-base |
| D. | Double-base |
| Answer» E. | |
| 33. |
In a UJT, the p-type emitter is ___________ doped? |
| A. | Lightly |
| B. | Heavily |
| C. | Moderately |
| D. | None of the above |
| Answer» C. Moderately | |
| 34. |
Power electronics essentially deals with control of a.c. power at ___________.? |
| A. | Frequencies above 20 kHz |
| B. | Frequencies above 1000 kHz |
| C. | Frequencies less than 10 Hz |
| D. | 50 Hz frequency |
| Answer» E. | |
| 35. |
The UJT may be used as ___________.? |
| A. | Am amplifier |
| B. | A sawtooth generator |
| C. | A rectifier |
| D. | None of the above |
| Answer» C. A rectifier | |
| 36. |
The normal way to turn on a diac is by ___________. |
| A. | Gate current |
| B. | Gate voltage |
| C. | Breakover voltage |
| D. | None of the above |
| Answer» D. None of the above | |
| 37. |
To turn on UJT, the forward bias on the emitter diode should be ___________ the peak point voltage. |
| A. | Less than |
| B. | Equal to |
| C. | More than |
| D. | None of the above |
| Answer» D. None of the above | |
| 38. |
When the temperature increases, the intrinsic stand off ratio ___________. |
| A. | Increases |
| B. | Decreases |
| C. | Essentially remains the same |
| D. | None of the above |
| Answer» D. None of the above | |
| 39. |
When the temperature increases, the inter-base resistance (RBB) of a UJT ___________. |
| A. | Increases |
| B. | Decreases |
| C. | Remains the same |
| D. | None of the above |
| Answer» B. Decreases | |
| 40. |
A UJT has ___________. |
| A. | Two pn junctions |
| B. | One pn junction |
| C. | Three pn junctions |
| D. | None of the above |
| Answer» C. Three pn junctions | |