Thyristors and Transducers Questions and Answers

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Showing 10 of 35 questions
Q1
A TRIAC:
  • A can trigger only on positive gate voltages
  • B can trigger only on negative gate voltages
  • C cannot be triggered with gate voltages
  • D can be triggered by either a positive or a negative gate voltage
Answer: Option D
Q2
When checking a good SCR or TRIAC with an ohmmeter it will:
  • A show high resistance in both directions
  • B show low resistance with positive on anode and negative on cathode, and high resistance when reversed
  • C show high resistance with negative on anode and positive on cathode, and low resistance when reversed
  • D show low resistance in both directions
Answer: Option A
Q3
.What does a hall effect sensor sense?
  • A temperature
  • B moisture
  • C magnetic fields
  • D pressure
Answer: Option C
Q4
What causes the piezoelectric effect?
  • A heat or dissimilar metals
  • B pressure on a crystal
  • C water running on iron
  • D a magnetic field
Answer: Option B
Q5
A UJT has:
  • A two base leads
  • B one emitter lead
  • C two emitter leads and one base lead
  • D one emitter lead and two base leads
Answer: Option D
Q6
The only way to close an SCR is with:
  • A a trigger input applied to the gate
  • B forward breakover voltage
  • C low-current dropout
  • D valley voltage
Answer: Option B
Q7
What is an SCR?
  • A a PNPN thyristor with 3 terminals
  • B a PNPN thyristor with 4 terminals
  • C a PNP thyristor with 3 terminals
  • D an NPN thyristor with 3 terminals
Answer: Option A
Q8
The only way to close an SCR is with:
  • A a trigger input applied to the gate
  • B forward breakover voltage
  • C low-current dropout
  • D valley voltage
Answer: Option B
Q9
What type of application would use a photovoltaic cell?
  • A an automobile horn
  • B a TI 92 calculator
  • C a magnetic field detector
  • D a remote power source
Answer: Option D
Q10
The smallest amount of current that the cathode-anode can have, and still sustain conduction of an SCR is called the:
  • A maximum forward current
  • B maximum forward gate current
  • C holding current
  • D reverse gate leakage current
Answer: Option D

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