Posted: September 14th, 2017

ELECTRONIC AND ELECTRICAL FUNDAMENTALS

ELECTRONIC AND ELECTRICAL FUNDAMENTALS
Convert the following numbers.
(
a
) 10001101
2
binary to decimal
(
b
) 171
10
decimal to hexadecimal
(
c
)B7
16
hexadecimal to binary
2.
Identify the following circuit symbols.
(
a
)
(
b
)
3.
For the circuit shown in Figure Q3 below, determine:
(
a
) the voltage V
CD
;
(
b
) the voltage V
BC
.
(4)
2
2
(4)
+
V
S
= 6 V
V
BD
= 4
.
4V
V
AC
= 2
.
8V
A
B
C
D
Figure Q3
4.
Referring to Figure Q4 shown below,
(
a
) determine the Boolean expression for output Z;
(
b
) draw the truth table for the circuit.
5.
For the circuit shown in Figure Q5 below:
(
a
) identify the circuit configuration;
(
b
) state the circuit voltage gain in terms of input and output voltages;
(
c
) state the circuit voltage gain in terms of resistors R
1
and R
2
;
(
d
) state the phase relationship between input and output voltage.
ABC
Z
Figure Q4
Figure Q5
V
IN
R
2
R
1
V
OUT
6.
Figure Q6(
a
) and Figure Q6(
b
) show a current carrying conductor placed
between the poles of a magnet. For each Figure, sketch the resultant magnetic
field around each conductor.
State whether you are using ‘conventional’ or ‘electron’ current flow.
7.
With reference to the circuit shown in Figure Q7:
(
a
) identify the circuit configuration;
(
b
) calculate the circuit gain;
(
c
) calculate the output voltage;
(
d
) state the phase relationship between input and output voltages.
(6)
Figure Q6(
a
)
Figure Q6(
b
)
Figure Q7
SN
NS
V
OUT
50 mV
10 k
O
1k
O
R
1
R
2
8.
(
a
) For the Boolean expression,
draw the logic circuit diagram.
(
b
) Show by diagram how two 2-input AND gates can be connected to perform
the logic function of a 3-input AND gate.
9.
For the circuit shown in Figure Q9, determine:
(
a
) the voltage across resistor R
2
;
(
b
) the current through resistor R
2
;
(
c
) the value of resistor R
1
;
(
d
) the voltage across resistor R
4
;
(
e
) the value of resistor R
4
;
(
f
) the supply current.
(8)
Z (A B).(A B C).(B C)
=+ ++ +
+
4V
1
.
6A
R
1
R
4
R
3
R
2
3
O
10
O
V
S
= 8V
(
a
) For the circuit shown in Figure Q10(
a
),
(i) name the circuit and its configuration;
(ii) name terminals 1, 2 and 3 of component Q
1
;
(iii) calculate the output voltage;
(iv) sketch the input and output waveforms to show the phase relationship
between them (numerical values are not required);
(v) state the purpose of capacitors C
1
and C
2
.
(
b
) With reference to the circuit shown in Figure Q10(
b
):
(i) what is the purpose of the diode D
1
?
(ii) explain the operation of the circuit when switch S
1
is closed and
switch S
2
is open;
(iii) the forward voltage drop of diodes D
1
and D
2
is 0
.
7 V. Sketch the
input and output waveforms showing peak values for each.
2
3
2
2
2
1
2
4
V
in
15 mV
1 kHz
V
out
=
C
1
Q
1
C
2
C
3
R
2
R
4
R
1
4
.
7k
O
R
3
10 k
O
Gain = 30
2
3
1
Figure Q10(
a
)
V
out
D
1
S
1
D
2
S
2
R
L
Voltage
source
30 V
(pk-pk)
Figure Q10(
b
)
0V
+V
DD
+

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