Question 1

The three leads of a bipolar junction transistor are called ____.&#10;A) anode, cathode, and gate&#10;B) main terminal 1, main terminal 2, and gate&#10;C) base 1, base 2, and emitter&#10;D) emitter, base, and collector

Accepted Answer

The three leads of a bipolar junction transistor are typically referred to as emitter, base, and collector. The emitter is the lead that emits electrons or holes, the base controls the flow of these particles, and the collector collects the electrons or holes. Option A is incorrect as "gate" is usually associated with field-effect transistors, not bipolar junction transistors. Option B is incorrect as "main terminal 1" and "main terminal 2" are not typically used to refer to the leads of a bipolar junction transistor. Option C is incorrect as there is only one base in a bipolar junction transistor.

Question 2

UJTs, SCRs, diacs, and triacs belong to a family of devices known as ____.&#10;A) FETs&#10;C) BJTs&#10;B) thyristors&#10;D) ICs

Accepted Answer

UJTs, SCRs, diacs, and triacs are all examples of thyristors, which are electronic devices used in power control and switching applications. FETs (field-effect transistors) and BJTs (bipolar junction transistors) are different types of semiconductor devices that function in different ways. ICs (integrated circuits) are a broader category of electronic devices that can include thyristors, FETs, BJTs, and many other components.

Question 3

The three leads of a MOSFET are called ____.&#10;A) anode, cathode, and gate&#10;B) main terminal 1, main terminal 2, and gate&#10;C) base 1, base 2, and emitter&#10;D) source, gate, and drain

Accepted Answer

The three leads of a MOSFET are named source, gate, and drain. The source is the terminal where current enters the MOSFET, while the drain is where the current exits. The gate is the input terminal that controls the flow of current between the source and the drain. Choice A is incorrect because anode and cathode are typically used to describe the leads of a diode or a transistor. Choice B is incorrect because main terminal 1 and main terminal 2 are not commonly used. Choice C is incorrect because base 1, base 2, and emitter are the leads of a bipolar junction transistor (BJT), not a MOSFET.

Question 4

An op-amp is configured so that the circuit has a gain of 1. This circuit is called a(n) ____.&#10;A) differential amplifier&#10;C) integrator&#10;B) buffer amplifier&#10;D) summing amplifier

Accepted Answer

A buffer amplifier is an op-amp circuit with a gain of 1. It is used to isolate the output from the input and to provide impedance matching between the input and output stages. It does not amplify the signal, but rather ensures that the output signal is a faithful reproduction of the input signal.

Question 5

A rectifier is a component that converts AC to DC by allowing the current to be ____.&#10;A) increased&#10;C) removed&#10;B) decreased&#10;D) all positive or all negative

Accepted Answer

A rectifier converts AC to DC by allowing only the positive or negative half-cycles of the current to pass through. It doesn't increase or decrease the current, nor does it remove it completely.

Question 6

A diode is tested with an ohmmeter. The ohmmeter indicates a reading of 4  $\Omega$ regardless of which way the ohmmeter leads are connected. The diode is probably ____.&#10;A) okay&#10;B) open&#10;C) shorted&#10;D) a zener

Accepted Answer

A diode should show low resistance in one direction and high resistance in the opposite direction. A reading of zero ohms (or very low resistance) in both directions suggests the diode is shorted, allowing current to flow freely in both directions.

Question 7

A(n) ____ is a three-terminal semiconductor device that operates as a switch when triggered into conduction by a gate signal. This device only conducts in one direction.&#10;A) diac&#10;C) SCR&#10;B) triac&#10;D) transistor

Accepted Answer

An SCR, or Silicon Controlled Rectifier, is a three-terminal semiconductor device that acts as a switch when triggered by a gate signal. It only conducts in one direction, making it useful for applications such as controlling the power to DC motors or lamps. Diacs, triacs, and transistors all have different operating characteristics and are not limited to one-directional conduction.

Question 8

When a 555 timer is operated in the astable mode, the output will be a ____.&#10;A) single pulse&#10;C) stream of pulses&#10;B) spike&#10;D) steady 5 V DC

Accepted Answer

When a 555 timer is operated in the astable mode, it generates a stream of continuous pulses, as it repeatedly charges and discharges a capacitor through a resistor. Therefore, the best choice is C) - stream of pulses. Choices A) and B) are incorrect as they suggest a single pulse or a spike, which are not characteristic of the astable mode. Choice D) is incorrect as it suggests a steady 5 V DC output, which is not possible in the astable mode.

Question 9

A diode that functions as a voltage-sensitive AC switch is called a ____.&#10;A) rectifier&#10;C) triac&#10;B) zener&#10;D) diac

Accepted Answer

A diac is a type of diode that acts as a voltage-sensitive AC switch, conducting current only after its breakover voltage has been exceeded.

Question 10

What do the letters &#34;LED&#34; represent?&#10;A) Light-emitting diode&#10;C) Lagging electrical device&#10;B) Loose electron delay&#10;D) Low-emission device

Accepted Answer

LED stands for Light-emitting diode.

Question 11

In order for a triac to conduct, the gate terminal must be ____.&#10;A) of the same polarity as MT1&#10;C) positive&#10;B) of the same polarity as MT2&#10;D) negative

Accepted Answer

The answer of In order for a triac to conduct,...

Question 12

Another name for an op-amp circuit used as a level detector is ____.&#10;A) comparator&#10;C) difference amplifier&#10;B) integrator&#10;D) summing amplifier

Accepted Answer

The answer of Another name for an op-amp circuit used...

Question 13

A photodiode ____.&#10;A) is used to capture pictures&#10;C) conducts in the presence of light&#10;B) emits light&#10;D) conducts in the absence of light

Accepted Answer

The answer of A photodiode ____.&#10;A) is used to capture...

Question 14

On a diode, the terminal represented by a T-shaped symbol is the ____.&#10;A) anode&#10;C) gate&#10;B) cathode&#10;D) trigger

Accepted Answer

The answer of On a diode, the terminal represented by...

Question 15

UJTs are considered to be what type of device?&#10;A) analog&#10;C) digital&#10;B) amplifier&#10;D) linear

Accepted Answer

The answer of UJTs are considered to be what type...

Question 16

The voltage measured across a conducting zener diode is always ____.&#10;A) 0.3 V&#10;B) 0.7 V&#10;C) 5.1 V&#10;D) whatever the voltage rating of the zener diode is

Accepted Answer

The answer of The voltage measured across a conducting zener...

Deck 23: Basic Industrial Electronics