PNPN Questions and Answers

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Q11
Which of the following devices has nearly the same turn-on time as turn-off time?
  • A SCR
  • B GTO
  • C SCS
  • D LASCR
Answer: Option B
Q12
Which of the transistors of an SCR are conducting when the SCR is fired and is in the conduction mode?
  • A npn
  • B pnp
  • C Both npn and pnp
  • D Neither npn nor pnp
Answer: Option C
Q13
For an SCS, a ________ pulse at the anode gate turns the device on, while a ________ pulse will turn it off.
  • A negative, positive
  • B positive, negative
Answer: Option A
Q14
An advantage of the SCR over the SCS is the reduced turn-off time.
  • A TRUE
  • B FALSE
Answer: Option B
Q15
Which of the following devices has (have) four layers of semiconductor materials?
  • A Silicon-controlled switch (SCS)
  • B Gate turn-off switch (GTO)
  • C Light-activated silicon-controlled rectifier (LASCR)
  • D All of the above
Answer: Option D
Q16
Which of the following parameters are usually provided by the manufacturer on the specification sheet for SCRs?
  • A Turn-on time (ton )
  • B Turn-off time (toff )
  • C Junction and case temperatures (tj and tc )
  • D All of the above
Answer: Option D
Q17
What is the maximum current (rms) rating for commercially available LASCRs today?
  • A 3 A
  • B 15 A
  • C 20 A
  • D 25 A
Answer: Option A
Q18
Which of the following areas is (are) applications of an SCS?
  • A Counters
  • B Pulse generators
  • C Voltage sensors
  • D All of the above
Answer: Option D
Q19
How many terminals does a silicon-controlled switch (SCS) device have?
  • A 2
  • B 3
  • C 4
  • D 5
Answer: Option C
Q20
What is the typical value of the triggering anode gate for SCS devices?
  • A 1.5 mA
  • B 150 A
  • C 15 A
  • D 1 A
Answer: Option A

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