Unit 2 - Electronic Components (2)

What kind of electronic device only conducts when it is gated an is used in d.c. motor control applications?

• Diode

• Transistor

• Diac

• Thyristor

What kind of device changes its resistance with a corresponding temperature change?

• Thyristor

• Triac

• Thermistor

• Transistor

A reed switch uses which effect of electricity?

• Heat

• Chemical

• Magnetism

• Fusion

Answer explanation

Which component is appropriate to be used to stop heat damage to a relay?

• Diode

• Capacitor

• Transistor

• Resistor

Which of the following is corrct?

• Diode = Rectifier

• Capacitor = Rectifier

• Transistor = Rectifier

• Resistor = Rectifier

Which of the following is correct?

(2 correct answers)

• Diodes are used as transformers

• Capacitors are used in smoothing circuits

• Transistors are used as electronic switches

• Resistors are used as amplifiers

If a diode is forward biased then it will pass current from...

• Cathode to anode

• Anode to cathode

• Base to collector

• Gate to anode

Answer explanation

An invertor...

• Changes a sinusoidal waveform to direct current

• Changes d.c. to a.c.

• Changes a.c. to d.c.

• Changes light to electricity

What kin of electronic device combines two zener diodes and will allow current flow in either direction once it reaches a certain value?

• Diode

• Transistor

• Diac

• Thyristor

NPN and PNP are types of?

• Diodes

• Transistors

• Diacs

• Thyristors