For the circuit shown in Figure 7.2 1(a), the parameters are: V C C = 3 V , R S i = 0 , R 1 = 110 kΩ , R 2 = 42 kΩ , R E = 0.5 kΩ , R C = 7 kΩ , and C C = 0.47 μ F . The transistor parameters are β = 150 , V B E (on) = 0.7 V , and V A = ∞ .(a) Determine the expression for and the value of the time constant τ S . (b) Determine the comer frequency and midband voltage gain. (Ans. (a) τ S = R i C C = 10.87 ms ; (b) f L = 14.6 Hz , A υ = − 10.84 )
For the circuit shown in Figure 7.2 1(a), the parameters are: V C C = 3 V , R S i = 0 , R 1 = 110 kΩ , R 2 = 42 kΩ , R E = 0.5 kΩ , R C = 7 kΩ , and C C = 0.47 μ F . The transistor parameters are β = 150 , V B E (on) = 0.7 V , and V A = ∞ .(a) Determine the expression for and the value of the time constant τ S . (b) Determine the comer frequency and midband voltage gain. (Ans. (a) τ S = R i C C = 10.87 ms ; (b) f L = 14.6 Hz , A υ = − 10.84 )
Solution Summary: The author explains the expression and the value of the time constant.
For the circuit shown in Figure 7.2 1(a), the parameters are:
V
C
C
=
3
V
,
R
S
i
=
0
,
R
1
=
110
kΩ
,
R
2
=
42
kΩ
,
R
E
=
0.5
kΩ
,
R
C
=
7
kΩ
, and
C
C
=
0.47
μ
F
. The transistor parameters are
β
=
150
,
V
B
E
(on)
=
0.7
V
, and
V
A
=
∞
.(a) Determine the expression for and the value of the time constant
τ
S
. (b) Determine the comer frequency and midband voltage gain. (Ans. (a)
τ
S
=
R
i
C
C
=
10.87
ms
; (b)
f
L
=
14.6
Hz
,
A
υ
=
−
10.84
)
5. Determine Leq at terminal a-b the circuit below. Ans.7.778 mH
10 mH
60 mH
25 mH
20 mH
a o
o b
ele
30 mH
draw a qpsk demodulation circuit using circuit components for instance resistors, capacitors, transistors etc
(c)
A 2400 V, 1000 KVA, 0.85 power factor (PF) lagging, 50 Hz six-poles, Y-connected
synchronous generator has a synchronous reactance of 1.4 2 and an armature
resistance of 0.15 2. At 50 Hz, its friction and windage losses are 25 kW, and its core
losses are 15 kW. The field circuit has a DC voltage of 230 V, and the maximum IF is
10 A. The resistance of the field circuit is adjustable over the range from 20 to 200 £2.
The Open Circuit Characteristic (OCC) of this generator is shown in Figure Q1(c).
Calculate the internal generated voltage, EA of this machine at rated
conditions.
(i)
(ii)
(iii)
Determine the required field current to make Vr equal to 2400 V when the
generator is running at rated conditions.
If this machine is operating at rated conditions, determine the input torque,
TAPP that must be applied to the shaft of this generator.
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