Silicon Controlled Rectifiers

1. An SCR behaves as a __________. switch

  1. Unidirectional
  2. Bidirectional
  3. Mechanical
  4. None of the above

Correct answer: (a)
Unidirectional

2. An SCR can exercise control over __________ of a.c. supply

  1. Positive half-cycles only
  2. Negative half-cycles only
  3. Both positive and negative half-cycles
  4. Positive or negative half-cycles

Correct answer: (D)
Positive or negative half-cycles

3. An SCR combines the features of __________

  1. A rectifier and resistance
  2. A rectifier and transistor
  3. A rectifier and capacitor
  4. None of the above

Correct answer: (B)
A rectifier and transistor

4. An SCR has __________ pn junctions

  1. Two
  2. Three
  3. Four
  4. None of the above

Correct answer: (B)
Three

5. An SCR has __________ semiconductor layers

  1. Two
  2. Three
  3. Four
  4. None of the above

Correct answer: (C)
Four

6. An SCR has three terminals viz __________

  1. Cathode, anode, gate
  2. Anode, cathode, grid
  3. Anode, cathode, drain
  4. None of the above

Correct answer: (A)
Cathode, anode, gate

7. An SCR is a __________ triggered device

  1. Voltage
  2. Current
  3. Voltage as well as current
  4. None of the above

Correct answer: (B)
Current

8. An SCR is a solid state equivalent of __________.

  1. Triode
  2. Pentode
  3. Gas-filled triode
  4. Tetrode

Correct answer: (C)
Gas-filled triode

9. An SCR is made of __________

  1. Germanium
  2. Silicon
  3. Carbon
  4. None of the above

Correct answer: (B)
Silicon

10. An SCR is made of silicon and not germanium because silicon __________

  1. Is inexpensive
  2. Is mechanically strong
  3. Has small leakage current
  4. Is tetravalent

Correct answer: (C)
Has small leakage current

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