Q.1

A silicon-controlled rectifier (SCR) has 3 terminals labeled base, collector, and emitter.

  • True
  • False
Q.2

Which is the DIAC?

  • mca14_10012a1.gif
  • mca14_10012b1.gif
  • mca14_10012c1.gif
  • mca14_10012d1.gif
Q.3

Once a DIAC is conducting, the only way to turn it off is with:

  • a positive gate voltage
  • a negative gate voltage
  • low-current dropout
  • breakover
Q.4

The PUT (programmable unijunction transistor) is actually a type of:

  • UJT thyristor
  • FET device
  • TRIAC
  • SCR
Q.5

The smallest amount of current that the cathode-anode can have, and still sustain conduction of an SCR is called the:

  • maximum forward current
  • maximum forward gate current
  • holding current
  • reverse gate leakage current
Q.6

A UJT has:

  • two base leads
  • one emitter lead
  • two emitter leads and one base lead
  • one emitter lead and two base leads
Q.7

A transducer's function is to:

  • transmit electrical energy
  • convert energy
  • produce mechanical energy
  • prevent current flow
Q.8

What is an SCR?

  • a PNPN thyristor with 3 terminals
  • a PNPN thyristor with 4 terminals
  • a PNP thyristor with 3 terminals
  • an NPN thyristor with 3 terminals
Q.9

The DIAC is a:

  • transistor
  • unidirectional device
  • three-layer device
  • bidirectional device
Q.10

What type of application would use a photovoltaic cell?

  • an automobile horn
  • a TI 92 calculator
  • a magnetic field detector
  • a remote power source
Q.11

What type of application would use an injection laser diode?

  • a 10BASE-T Ethernet
  • a liquid crystal display
  • a fiber optic transmission line
  • a good flashlight
Q.12

What type of application would use an injection laser diode?

  • a 10BASE-T Ethernet
  • a liquid crystal display
  • a fiber optic transmission line
  • a good flashlight
Q.13

Which is the seven-segment display?

  • mca14_10013a1.gif
  • mca14_10013b1.gif
  • mca14_10013c1.gif
  • mca14_10013d1.gif
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