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MCQs

Total Questions : 202 | Page 5 of 21 pages
Question 41. The V-I characteristics for a triac in the first and third quadrants are essentially identical to those of ___________ in its first quadrant
  1.    None of these
  2.    SCR
  3.    Transistor
  4.    UJT
 Discuss Question
Answer: Option B. -> SCR
Question 42. When the temperature increases, the intrinsic stand off ratio ___________.
  1.    Increases
  2.    Essentially remains the same
  3.    None of these
  4.    Decreases
 Discuss Question
Answer: Option B. -> Essentially remains the same
Question 43. A Triac has three terminals viz ___________
  1.    None of these
  2.    Two main terminal and a gate terminal
  3.    Cathode, anode, gate
  4.    Drain, source, gate
 Discuss Question
Answer: Option B. -> Two main terminal and a gate terminal
Question 44. The device that does not have the gate terminal is ___________.
  1.    Diac
  2.    FET
  3.    Triac
  4.    SCR
 Discuss Question
Answer: Option A. -> Diac
Question 45. A diac is simply ___________.
  1.    A triac without gate terminal
  2.    A three junction device
  3.    None of these
  4.    A single junction device
 Discuss Question
Answer: Option A. -> A triac without gate terminal
Question 46. Power electronics essentially deals with control of a.c. power at ___________.
  1.    Frequencies less than 10 Hz
  2.    Frequencies above 1000 kHz
  3.    Frequencies above 20 kHz
  4.    50 Hz frequency
 Discuss Question
Answer: Option D. -> 50 Hz frequency
Question 47. A diac is ___________ switch
  1.    A d.c.
  2.    A mechanical
  3.    None of these
  4.    An c.
 Discuss Question
Answer: Option D. -> An c.
Question 48. A triac has ___________ semiconductor layers.
  1.    Three
  2.    Two
  3.    Five
  4.    Four
 Discuss Question
Answer: Option D. -> Four
Question 49. When the temperature increases, the inter-base resistance (RBB) of a UJT ___________.
  1.    Increases
  2.    Remains the same
  3.    None of these
  4.    Decreases
 Discuss Question
Answer: Option A. -> Increases
Question 50. When a UJT is turned ON, the resistance between emitter terminal and lower base terminal ___________
  1.    None of these
  2.    Remains the same
  3.    Is decreased
  4.    Is increased
 Discuss Question
Answer: Option C. -> Is decreased

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