Q.1.
A silicon-controlled rectifier (SCR) has 3 terminals labeled base, collector, and emitter.
-
True -
False
Q.2.
Which is the DIAC?
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?
