Exam Details
| Subject | Industrial Electronics | |
| Paper | ||
| Exam / Course | Diploma In Electronics And Communication Engineering (DECVI)/ Advanced Level Certificate Course In Electronics And Communication Engineering (ACEVI)/ | |
| Department | School of Engineering & Technology (SOET) | |
| Organization | indira gandhi national open university | |
| Position | ||
| Exam Date | June, 2015 | |
| City, State | new delhi, |
Question Paper
1. Choose the correct answer
When a UJT is used for triggering an SCR, the shape of the waveform of the voltage obtained from the UJT circuit is
Sine wave
Saw tooth wave
Square wave
None of the above
The turn-off time of a transistor is
tOFF td tf
tOFF ts+ tf
tOFF td tr
tOFF td ts
A freewheeling diode is used in a controlled rectifier circuit in the case of
a resistive load
an inductive load
a capacitive load
All the above
In a single-phase full converter, for continuous conduction each pair of SCRs conduct for
n-a
n
a
a-n
An ideal transistor switch has
zero ON-value resistance
infinite OFF-value resistance
no power loss
None of the above
In a three-phase full wave fully controlled bridge rectifier each SCR conducts for a duration of
120°
60°
45°
180°
In a UJT, with VBB as the voltage across two base terminals, the emitter potential at peak point is given by
nVBB
nVD
nVBB VD
nVD VBB
Define latching and holding currents as applicable to an SCR. Show these currents on the static volt-ampere characteristic curve of an SCR.
Explain the different methods for turning on of an SCR.
Why is a separate freewheeling diode not needed in the case of a single-phase full wave, half controlled bridge rectifier?
Explain the construction and draw the V-I characteristic curve of a Triac.
A unijunction transistor used for triggering the silicon controlled rectifier has RBI k.ohm and RB2 =2·5 k.ohm. Find
the value of intrinsic stand-off ratio.
Peak point voltage, if VBB 15 V and barrier potential 0·7 V.
Explain the working of an oscillator employing UJT for triggering the SCR.
5. Explain how can the transistor can be used as a switching element, with the help of its output characteristic curve for a switching transistor. Also compare the transistor and SCR as switching elements.
Explain the principle of operation of IGBT. What are its advantages over the power transistors
Differentiate between full controlled bridge rectifiers and half controlled bridge rectifiers.
7. Write short notes on any two of the following:
Three-phase half-wave Delta-Wye rectifier
dv/dt triggering
MOS controlled Thyristor
When a UJT is used for triggering an SCR, the shape of the waveform of the voltage obtained from the UJT circuit is
Sine wave
Saw tooth wave
Square wave
None of the above
The turn-off time of a transistor is
tOFF td tf
tOFF ts+ tf
tOFF td tr
tOFF td ts
A freewheeling diode is used in a controlled rectifier circuit in the case of
a resistive load
an inductive load
a capacitive load
All the above
In a single-phase full converter, for continuous conduction each pair of SCRs conduct for
n-a
n
a
a-n
An ideal transistor switch has
zero ON-value resistance
infinite OFF-value resistance
no power loss
None of the above
In a three-phase full wave fully controlled bridge rectifier each SCR conducts for a duration of
120°
60°
45°
180°
In a UJT, with VBB as the voltage across two base terminals, the emitter potential at peak point is given by
nVBB
nVD
nVBB VD
nVD VBB
Define latching and holding currents as applicable to an SCR. Show these currents on the static volt-ampere characteristic curve of an SCR.
Explain the different methods for turning on of an SCR.
Why is a separate freewheeling diode not needed in the case of a single-phase full wave, half controlled bridge rectifier?
Explain the construction and draw the V-I characteristic curve of a Triac.
A unijunction transistor used for triggering the silicon controlled rectifier has RBI k.ohm and RB2 =2·5 k.ohm. Find
the value of intrinsic stand-off ratio.
Peak point voltage, if VBB 15 V and barrier potential 0·7 V.
Explain the working of an oscillator employing UJT for triggering the SCR.
5. Explain how can the transistor can be used as a switching element, with the help of its output characteristic curve for a switching transistor. Also compare the transistor and SCR as switching elements.
Explain the principle of operation of IGBT. What are its advantages over the power transistors
Differentiate between full controlled bridge rectifiers and half controlled bridge rectifiers.
7. Write short notes on any two of the following:
Three-phase half-wave Delta-Wye rectifier
dv/dt triggering
MOS controlled Thyristor
Other Question Papers
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