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MCQs

Total Questions : 18 | Page 1 of 2 pages
Question 1.  What does a hall effect sensor sense?
  1.    temperature
  2.    moisture
  3.    magnetic fields
  4.    pressure
 Discuss Question
Answer: Option C. -> magnetic fields
Question 2.  A UJT has:
  1.    two base leads
  2.    one emitter lead
  3.    two emitter leads and one base lead
  4.    one emitter lead and two base leads
 Discuss Question
Answer: Option D. -> one emitter lead and two base leads
Question 3.  A TRIAC:
  1.    can trigger only on positive gate voltages
  2.    can trigger only on negative gate voltages
  3.    cannot be triggered with gate voltages
  4.    can be triggered by either a positive or a negative gate voltage
 Discuss Question
Answer: Option D. -> can be triggered by either a positive or a negative gate voltage
Question 4.  When checking a good SCR or TRIAC with an ohmmeter it will:
  1.    show high resistance in both directions
  2.    show low resistance with positive on anode and negative on cathode, and high resistance when reversed
  3.    show high resistance with negative on anode and positive on cathode, and low resistance when reversed
  4.    show low resistance in both directions
 Discuss Question
Answer: Option A. -> show high resistance in both directions
Question 5.  What causes the piezoelectric effect?
  1.    heat or dissimilar metals
  2.    pressure on a crystal
  3.    water running on iron
  4.    a magnetic field
 Discuss Question
Answer: Option B. -> pressure on a crystal
Question 6.  The only way to close an SCR is with:
  1.    a trigger input applied to the gate
  2.    forward breakover voltage
  3.    low-current dropout
  4.    valley voltage
 Discuss Question
Answer: Option B. -> forward breakover voltage
Question 7.  What is an SCR?
  1.    a PNPN thyristor with 3 terminals
  2.    a PNPN thyristor with 4 terminals
  3.    a PNP thyristor with 3 terminals
  4.    an NPN thyristor with 3 terminals
 Discuss Question
Answer: Option A. -> a PNPN thyristor with 3 terminals
Question 8.  The smallest amount of current that the cathode-anode can have, and still sustain conduction of an SCR is called the:
  1.    maximum forward current
  2.    maximum forward gate current
  3.    holding current
  4.    reverse gate leakage current
 Discuss Question
Answer: Option D. -> reverse gate leakage current
Question 9.  What type of application would use a photovoltaic cell?
  1.    an automobile horn
  2.    a TI 92 calculator
  3.    a magnetic field detector
  4.    a remote power source
 Discuss Question
Answer: Option D. -> a remote power source
Question 10. . Once a DIAC is conducting, the only way to turn it off is with:
  1.    a positive gate voltage
  2.    a negative gate voltage
  3.    low-current dropout
  4.    breakover
 Discuss Question
Answer: Option C. -> low-current dropout

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