Calculate the values for all resistors
January 19, 2018
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January 19, 2018

Refer to Figure 2 below, what is the possible problem if VB is equal to 0 V and VC is equal to 15 V?

ET 212 Final Examination Answers – Grantham

Select True / False from the following :

Question 1

The two basic kinds of transistor circuits are amplifying and switching.



Question 2

The bridge rectifier is similar to a full-wave rectifier because it produces a full-wave output voltage.



Question 3

A semiconductor is an element with electrical properties between those of a conductor and those of an insulator.



Question 4

The dc beta is defined as the dc collector current divided by the dc emitter current.



Question 5

An ideal diode acts like a switch that closes when forward-biased and opens when reverse-biased.



Question 6

With a half-wave rectifier, the output frequency equals the input frequency.



Select Correct Answers from the Following

Question 7

A pure semiconductor is also referred to as:

a clean room device
4 points

Question 8

Silicon that has been doped with a trivalent impurity is called a:

N-type semiconductor
P-type semiconductor
P-N junction
covalent bond
4 points

Question 9

In a silicon atom, what is the distance between the valence band and the conduction band called?

energy gap
depletion layer
P-N junction
4 points

Question 10

A diode is a nonlinear device because the graph of its current versus voltage is:

a straight line
not a straight line
inversely proportional to the resistance
4 points

Question 11

Ideally, a diode acts like a perfect conductor when forward-biased and:

like a perfect conductor when reverse-biased
like a perfect semiconductor when reverse-biased
like a perfect insulator when reverse-biased
like a perfect diode when reverse-biased
4 points

Question 12

A diode that exhibits high resistance in both directions when measured with an ohmmeter is:

a properly operating diode
4 points

Question 13

The knee voltage of a germanium diode is approximately ________.

0.7 V
0.3 V
1.7 V
1.3 V
4 points

Question 14

Much of the information on a manufacturer’s data sheet is:

necessary to understand diode circuits
necessary to troubleshoot diode circuits
obscure and of use only to circuit designers
necessary only to electronics technicians
4 points

Question 15

The output frequency of a half-wave rectifier is:

twice the input frequency
half the input frequency
equal to the input frequency
four times the input frequency
4 points

Question 16

A step-up transformer will produce a secondary voltage that is:

smaller than the primary
equal to the primary
larger than the primary
4 points

Question 17

What is the name of the circuit shown in the Figure 1 below?

Figure 1

half-wave rectifier
full-wave rectifier
bridge rectifier
voltage doubler
4 points

Question 18

Which region of the transistor is physically the largest?

4 points

Question 19

Kirchhoff’s current law describes transistor currents as follows:

emitter current equals the sum of collector and base currents.
collector current equals the sum of base and emitter currents.
base current equals the sum of collector and emitter currents.
emitter current equals collector current minus the base current.
4 points

Question 20

Refer to Figure 2 below, what is the possible problem if VB is equal to 0 V and VC is equal to 15 V?

Figure 2

transistor is shorted
RB is open
VCC is 0 V
transistor is blown open
4 points

Question 21

Refer to Figure 2, what is the possible problem if VB is equal to 15 V and VC is equal to 15 V?

Figure 2

transistor is blown open
VBB is 0 V
transistor is shorted
VCC is 0 V
4 points

Question 22

Using the load line shown in Figure 3, what is the transistor’s collector current if biased at the point labelled Q?

Figure 3

1.5 mA
3 mA
4.5 mA
7 mA
4 points

Question 23

In the circuit shown in the Figure 4 below, calculate the saturation current?

Figure 4

4 points

Question 24

In the Common Collector (CC) circuit of Figure 5 below consider β = 49 and VBE = 0.7 V.

Figure 5

Find the following:






20 points


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