Electronics and Communication Engineering - Electronic Devices and Circuits
Exercise : Electronic Devices and Circuits - Section 5
- Electronic Devices and Circuits - Section 14
- Electronic Devices and Circuits - Section 27
- Electronic Devices and Circuits - Section 26
- Electronic Devices and Circuits - Section 25
- Electronic Devices and Circuits - Section 24
- Electronic Devices and Circuits - Section 23
- Electronic Devices and Circuits - Section 22
- Electronic Devices and Circuits - Section 21
- Electronic Devices and Circuits - Section 20
- Electronic Devices and Circuits - Section 19
- Electronic Devices and Circuits - Section 18
- Electronic Devices and Circuits - Section 17
- Electronic Devices and Circuits - Section 16
- Electronic Devices and Circuits - Section 15
- Electronic Devices and Circuits - Section 1
- Electronic Devices and Circuits - Section 13
- Electronic Devices and Circuits - Section 12
- Electronic Devices and Circuits - Section 11
- Electronic Devices and Circuits - Section 10
- Electronic Devices and Circuits - Section 9
- Electronic Devices and Circuits - Section 8
- Electronic Devices and Circuits - Section 7
- Electronic Devices and Circuits - Section 6
- Electronic Devices and Circuits - Section 5
- Electronic Devices and Circuits - Section 4
- Electronic Devices and Circuits - Section 3
- Electronic Devices and Circuits - Section 2
31.
The function of a choke in a fluorescent lamp is
Answer: Option
Explanation:
At the time of starting the choke provides a high voltage. During working there is voltage drop across choke so that lamp gets proper voltage.
32.
A series resonant circuit is fed by a voltage having rms value V. At resonance, the voltage across inductance VL and voltage across capacitance VC are related as
Answer: Option
Explanation:
At resonance XL = XC. Therefore IXL = IXC or VL = VC.
33.
Calculate i(t) for t ≥ 0, assuming the switch has been in position A for a long time at t = 0, the switch is moved to position B.
Answer: Option
Explanation:
When switch is in A position, C will be open, t < 0,
i(0-) = 
= 1.11 mA,
VC(0-) = 3 k x 3.33 volt at t > 0
i(0+) = 1.11 mA, i(t) = A + B e-at
where 
5 x 103 at t = 0, A + B = 1.11
t = ∞, A = 0 i(t) = 1.11 e-5 x 103(t) .
34.
In figure, capacitor is uncharged. The switch is closed at t = 0 at t = 0+ di/dt is
Answer: Option
Explanation:
RC = 10-3, 
= 0.1 e-1000t. Therefore 
at t = 0+ equals -100 A/s.
35.
In a series RLC circuit, R = 2 kΩ, L = 1H and 
The resonant frequency is
The resonant frequency isAnswer: Option
Explanation:
.
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