Question 1

The ohmmeter will indicate continuity when the positive lead is connected to the anode and the negative lead is connected to the cathode.

Accepted Answer

This is correct. An ohmmeter will indicate continuity when the positive lead is connected to the anode and the negative lead is connected to the cathode.

Question 2

The unijunction transistor is made by combining three layers of semi-conductor material.

Accepted Answer

The unijunction transistor is indeed made by combining three layers of semi-conductor material.

Question 3

The unijunction transistor is a special transistor that has three bases and one emitter.

Accepted Answer

The unijunction transistor has one emitter, one base, and one intrinsic region.

Question 4

The UJT has three paths for current flow.

Accepted Answer

The UJT (Uni-Junction Transistor) has only one path for current flow between its emitter and the single junction formed by the n-type and p-type semiconductor materials.

Question 5

The unijunction transistor can be tested in a manner very similar to testing a common junction transistor.

Accepted Answer

The unijunction transistor can be tested using a multimeter in the same way a common junction transistor is tested. The only difference is that there is only one PN junction in a unijunction transistor, while a common junction transistor has two.

Question 6

The unijunction transistor (UJT) is generally classified with a group of devices known as ____.&#10;A) thermistors&#10;B) triacs&#10;C) thermostats&#10;D) thyristors

Accepted Answer

The UJT is a type of thyristor, which also includes devices such as SCR, GTO, and TRIAC.

Question 7

The UJT ____.&#10;A) has a constant pulse rate&#10;B) has a current flow in both paths in its normal state regardless of the voltage&#10;C) can have a large output pulse&#10;D) can have a large amount of capacitance

Accepted Answer

The UJT (Unijunction Transistor) can have a large output pulse, which is a characteristic feature of its operation, especially useful in triggering and timing circuits.

Question 8

If the negative lead of the ohmmeter is connected to the emitter of the UJT, no connection should be seen between the emitter and ____.&#10;A) either base&#10;B) the ohmmeter&#10;C) the output&#10;D) the rectifier

Accepted Answer

In a Unijunction Transistor (UJT), the emitter is not directly connected to either of the bases (Base1 or Base2) in its normal untriggered state, hence an ohmmeter should not show a connection between the emitter and either base.

Question 9

In the unijunction transistor, the variable resistor controls the rate of charge time of the ____.&#10;A) triac&#10;B) capacitor&#10;C) diac&#10;D) siliconcontrolled rectifier (SCR)

Accepted Answer

The variable resistor in a unijunction transistor is commonly used to control the rate of charge time of the capacitor in the transistor's relaxation oscillator circuit.

Question 10

The unijunction transistor (UJT) is a(n) ____ device.&#10;A) digital&#10;B) programmable&#10;C) analog&#10;D) manual

Accepted Answer

The answer of The unijunction transistor (UJT) is a(n) ____...

Deck 53: The Unijunction Transistor