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Power Electronics Quiz

Total questions: 45

Worksheet time: 24mins

Name
Class
Date
1.

A silicon controlled rectifier (SCR) is a

a)

Unijunction device

b)

Device with three junction

c)

Device with four junction

d)

None of the above

2.

A thyristor is basically

a)

PNPN Device

b)

A combination of diac and triac

c)

A set of SCRs

d)

A set of SCR, diac and a triac

3.

Which semiconductor power device out of the following, is not a current triggering device?

a)

Thyristor

b)

Triac

c)

GTO

d)

MOSFET

4.

A thyristor equivalent of a thyratron tube is a

a)

DIAC

b)

TRIAC

c)

Silicon controlled rectifier

d)

BJT

5.

Secondary breakdown occurs in

a)

MOSFET but not in BJT

b)

Both MOSFET and BJT

c)

BJT but not in MOSFET

d)

None of the above

6.

Which of the following devices should be used as a switch in a low power switched mode power supply (SMPS)?

a)

GTO

b)

MOSFET

c)

TRIAC

d)

SCR

7.
For an SCR in the forward blocking mode (practically)
a)
leakage current does not flow
b)
leakage current flows from anode to cathode
c)
leakage current flows from cathode to anode
d)
leakage current flows from gate to anode
8.
 A dual converters has
a)
 two full converters in series
b)
 two half converters in series
c)
two full converters in anti-parallel
d)
two half converters in anti-parallel
9.
The four quadrant operation of dual converters can be obtained by
a)
changing the firing angle value
b)
moving the mechanical lever
c)
adding inductance to the circuit
d)
none of the mentioned
10.
dv/dt protection is provided to the SCR by
a)
connecting a capacitor in parallel with the load
b)
connecting an inductor in series with the load
c)
connecting a capacitor & resister in parallel with the device
d)
connecting an inductor & resister in parallel with the device
11.

Gate of MOSFET is insulated with layer of...?

a)

SiO2

b)

O2

c)

Si

d)

None

12.

What is the full form of IGBT...?

a)

Insulation gate bipolar transistor

b)

Insulation gate bidirectional transistor

c)

Insulated gate bipolar transistor

d)

Insulated gate bidirectional transistor

13.

what is the meaning of rectification?

a)

a process of smoothing using a capacitor

b)

a process of converting an alternating current into a direct current by using a diode.

c)

a process of converting a direct current into an alternating current by using a diode.

14.

The diagram shown as a process of?

a)

a half wave rectification

b)

a full wave rectification

c)

a full bridge rectification

15.

is at is diode function?

a)

is a resistor

b)

allow current to flow into one direction

c)

allow current to flow into two direction

d)

is converting Direct current to AC current

16.

The number of diodes used to build a bridge rectifier?

a)

1

b)

2

c)

3

d)

4

17.

Doping is a process of adding a certain amount of specific impurities to semiconductor. What is the purpose of doping?

a)

To increase the resistance of semiconductor

b)

To increase the thermal energy of semiconductor

c)

To increase the temperature of the semiconductor

d)

To increase the conductivity of the semiconductor

18.

Which of the following circuits will light up the bulb?

a)

A

b)

B

c)

C

d)

D

19.

Which of the following circuits shows the forward-biased arrangement of a diode?

a)

A

b)

B

c)

C

d)

D

20.

What is the function of a diode?

a)

Acts as a current amplifier

b)

Acts as an automatic switch

c)

Stores electric charge

d)

Allows the current to pass in one direction only

21.

What does the Omega symbol stand for in Electrical terms?

a)

Voltage

b)

Ohm's

c)

Wattage

d)

Amperage

22.

A transistor has …………………

a)

A. one pn junction

b)

B. two pn junctions

c)

C. three pn junctions

d)

D. four pn junctions

23.

In a BJT

a)

A. The base region is sandwiched between emitter and collector

b)

B. The collector is sandwiched between base and emitter

c)

C. The emitter region is sandwiched between base and collector

d)

D. None of the above

24.

In a npn transistor, ……………. are the minority carriers

a)

A. free electrons

b)

B. holes

c)

C. donor ions

d)

D.acceptor ions

25.

A Triac has three terminals viz ………………

a)

A. Drain, source, gate

b)

B. Two main terminal and a gate terminal

c)

C. Cathode, anode, gate

d)

D. None of the above

26.

An SCR has three terminals viz ……………

a)

A. Cathode, anode, gate

b)

B. Anode, cathode, grid

c)

C. Anode, cathode, drain

d)

D.None of the above

27.

PUT stands for

a)

A. Programmable Unijunction Transistor

b)

B. Programmable Universal Transistor

c)

C. Pulse Unijunction Transistor

d)

D. Pulse Universal Transistor

28.

What is the formula for average value of output voltage?

a)

2Vm/π

b)

Vm/π

c)

Vm/sqrt(2)

d)

Vm

29.

DC average voltage of a full wave rectifier output is (Vdc)

a)

2 Vm/π

b)

Im/π

c)

Im /2π

d)

1.414 Im /π

30.

Form factor

a)

Rms /Avg

b)

Avg/Rms

c)

Rms * Avg

d)

1.414

31.

What is the Ripple factor of a fullwave rectifier ?

a)

0.48

b)

0.31

c)

0.707

d)

1.414

32.

Rectifier is Converter___to ______

(a)  

33.

How many diodes used in a half-wave rectifier's circuit?

a)

1

b)

2

c)

3

d)

4

34.

Choose the uncontrolled full-wave rectifier's circuit diagrams.

a)
b)
c)
d)
35.

If the firing angle of single phase fully controlled rectifier is decreased, the output is

a)

increased

b)

maximum

c)

decreased

d)

none of the above

36.

A fully controlled converter uses

a)

diodes only

b)

thyristors only

c)

both diodes and thyristors

d)

none of the mentioned

37.

In a fully controlled bridge converter

a)

one SCR conducts at a time

b)

two SCRs conduct at a time

c)

three SCRs conduct at a time

d)

four SCRs conduct at a time

38.

What will happen, if we connect capacitor to DC Supply.

a)

It allows DC

b)

It blocks DC

c)

t rectifies

d)

None of these

e)

Hint: Diode is unidirectional and uncontrolled device. In rectifier circuit, diode use as a switch to convert ac to dc for rectification purpose.

39.

The forbidden energy gap for Silicon is of the order of

a)

0.7 eV

b)

0.3 eV

c)

1.1 eV

d)

10 eV

40.
Name this electronic component
a)
Capacitor
b)
Fixed Resistor
c)
Potentiometer
d)
Transistor
41.

which statement is correct? (the dark circles represent the electrons)

a)

p-type of the diode is connected to the negative terminal.

b)

Electron moves across the p-n junction, makes the diode forward biased

c)

current will not flow in the circuit

d)

reverse biased circuit

42.

The characteristics of p-type semiconductors is includes

a)

Majority carriers are electron

b)

Has tendency to gain electron

c)

Has tendency to donor electron

d)

Easy to conduct electricity

43.

The process of adding an impurity to an intrinsic semiconductor is called

a)

Doping

b)

Ionization

c)

Recombination

d)

Atomic modification

44.

Which of the following is a symbol of NPN transistor ?

a)
b)
c)
d)
45.

LED is

a)

Light Enhancing Diode

b)

Light Emitting Diode

c)

Light Emitting Detector

d)

Light Enhancing Detector

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