Thyristors and Tranducers

Q1: 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

Q2: Which is the TRIAC?

A
mca14_10011a1.gif

B
mca14_10011b1.gif

C
mca14_10011c1.gif

D
mca14_10011d1.gif

Q3: Which is the DIAC?

A
mca14_10012a1.gif

B
mca14_10012b1.gif

C
mca14_10012c1.gif

D
mca14_10012d1.gif

Q4: The DIAC is a:

A transistor

B unidirectional device

C three-layer device

D bidirectional device

Q5: A transducer's function is to:

A transmit electrical energy

B convert energy

C produce mechanical energy

D prevent current flow

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

Q7: 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

Q8: 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

Q9: The PUT (programmable unijunction transistor) is actually a type of:

A UJT thyristor

B FET device

C TRIAC

D SCR

Q10: What causes the piezoelectric effect?

A heat or dissimilar metals

B pressure on a crystal

C water running on iron

D a magnetic field

Q11: Which is the seven-segment display?

A
mca14_10013a1.gif

B
mca14_10013b1.gif

C
mca14_10013c1.gif

D
mca14_10013d1.gif

Q12: Once a DIAC is conducting, the only way to turn it off is with:

A a positive gate voltage

B a negative gate voltage

C low-current dropout

D breakover

Q13: 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

Q14: What type of application would use an injection laser diode?

A a 10BASE-T Ethernet

B a liquid crystal display

C a fiber optic transmission line

D a good flashlight

Q15: 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

Q16: 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

Q17: What does a hall effect sensor sense?

A temperature

B moisture

C magnetic fields

D pressure


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