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1. Attempt any five of the
following : 10
a) State the applications of
MOSFET (any two).
b) Draw the V-I characteristics of
power transistor.
c) Draw the symbol of GTO and
TRIAC. **
d) Define triggering. List the
type of triggering. *
e) Define commutation. Give the
types of commutation. **
f) Define needs of UPS. **
g) State the applications of power
electronics.
h) State the advantages of SMPS.
i) Define
(i)
Holding current,
(ii)
Latching current of SCR.
2. Attempt any three of the
following : 12
a) Describe with neat sketch the
construction and working principle of MOSFET.
b) Draw construction of SCR using
two transistor model. Explain its operation.
c) Explain the operation of RC
triggering circuit with neat diagram.
d) Draw a neat diagram of 1φ half
wave controlled converter with RL load. Give its operation. *
e) Describe triggering of SCR
using UJT relaxation oscillator. **
f) Draw the I-V characteristics of
power transistor. Show all regions. **
g) Compare SCR & TRIAC (any
four). **
h) Explain two transistor analogy
of SCR with neat diagram.
3. Attempt any three of the
following : 12
a) Draw a neat labelling V-I
characteristics of SCR & GTO and explain the region. **
b) Explain the operation of PUT
& PUT relaxation oscillator with diagram. *
c) Explain with sketch the
operation of single phase fully & bridge controlled midpoint configuration
with R load. **
d) Give the operation of battery
charger using SCR with a neat diagram. **
e) Explain with neat circuit
diagram operation of temperature controller using SCR.
f) Explain with circuit diagram of
1f mid-point controlled
rectifier with R-load. *
g) Explain the thermal triggering
method of SCR. Enlist different triggering methods of SCR.
4. Attempt any three of the
following : 12
a) Explain the operation of
snubber protection circuit with diagram.
b) Explain the operation of opto
coupler based triggering circuit with diagram.
c) Give the concept of firing
angle and conduction angle with a neat waveform. **
d) Draw the circuit diagram of DC
static circuit breaker and give its operation.
e) Describe emergency lighting
system with neat diagram. *
f) Differentiate between Natural
and Forced commutation (any four).
g) Draw construction of IGBT.
State any two applications of it. **
h) Explain with circuit diagram
the working of 1f
halfwave controlled rectifier with R-L load. **
i) Explain triggering of SCR using
opto-coupler. State its advantages.
j) Explain the working principle
of SMPS with neat diagram.
5. Attempt any two of the
following : 12
a) Draw a symbol and neat
labelling V-I characteristics of and explain its operation. **
b) Explain auxiliary commutation
with a neat diagram. Also draw its waveform.
c) Explain in detail over-voltage
protection.
d) Draw a structure of TRIAC with
doping levels. Write operating principle and give two applications of it. *
e) Draw the circuit diagram &
waveforms of class A , class B & class D commutation. Explain its working.**
f) With neat sketch explain four
modes of operation of a TRIAC. 6
g) Describe working of online UPS.
List any two applications of UPS.
6. Attempt any two of the
following : 12
a) Give the operation of single
phase full wave bridge controlled converter with RL load with a neat diagram.
Also draw its waveform. *
b) Give the effect of source
impedance on converter operation.
c) Explain the operation of UPS
with a neat block diagram.
d) Draw full bridge & half
bridge configuration with common cathode.
e) Explain working of AC circuit
breaker using SCR with circuit diagram. **
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