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PowerElectronicsBasics

Total questions: 45

Worksheet time: 35mins

Name
Class
Date
1.

What is known as an "Inverter"?

a)

AC/DC Converter

b)

DC/AC Converter

c)

AC/AC Converter

d)

DC/DC Converter

2.

What is the correct statement about Buck Converters?

a)

Boosts a battery voltage from 200V DC to 500V DC.

b)

Step down the voltage from 500V AC to 200V DC.

c)

Step up voltage from 200V DC to 500V AC.

d)

Step down the voltage from 500V DC to 200V DC.

3.

What is the meaning of SMPS?

a)

Switched-mode power source

b)

Switched-mode power system

c)

Switched-mode power supply

d)

Switched-mode power sensor

4.

Select the incorrect statement on LEDs.

a)

LEDs have lower energy consumption compared to CFL bulbs.

b)

LEDs have longer lifetime.

c)

LEDs are not reliable

d)

LEDs are smaller in size.

5.

Which of the followings is not an application of power electronics?

a)

Battery Chargers

b)

Motors

c)

Uninterruptible Power Supply

d)

Wind-electric systems

6.

what is not an element of a power electronic circuit?

a)

Capacitor

b)

Inductor

c)

Encoder

d)

Resistor

7.

Which form does a capacitor store energy?

a)

Magnetic field

b)

Electric pulse

c)

Electric field

d)

Electric charge

8.
Material that electricity can easily flow through
a)
Insulators
b)
Rubber
c)
Conductor
d)
Wood
9.
Identify the Converter type?
a)
1Φ Dual Converter
b)
3Φ Single Converter
c)
3Φ Dual Converter
d)
1Φ Single Converter
10.
A fully controlled converter uses
a)
 diodes only
b)
 thyristors only
c)
 both diodes and thyristors
d)
Noe of them
11.
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
12.
 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
13.
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
14.
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
15.
The time constant of a series RC circuit (τ) is given by
a)
R/C
b)
C/R
c)
RC
d)
1/RC
16.

Which device can be used in a chopper circuit?

a)

GTO

b)

IGBT

c)

MOSFET

d)

ALL

17.

1) 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

18.

2) A transistor has …………………

a)

A. one pn junction

b)

B. two pn junctions

c)

C. three pn junctions

d)

D. four pn junctions

19.

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

a)

A. free electrons

b)

B. holes

c)

C. donor ions

d)

D.acceptor ions

20.

6) The device that does not have the gate terminal is ……………….

a)

A. Triac

b)

B. FET

c)

C. SCR

d)

D. Diac

21.

5) A DIAC has three terminals viz ………………

a)

A. Drain, source, gate

b)

B. Two main terminal

c)

C. Cathode, anode, gate

d)

D. None of the above

22.

4) 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

23.

6) The device that does not have the gate terminal is ……………….

a)

A. Triac

b)

B. FET

c)

C. SCR

d)

D. Diac

24.

7) A UJT is sometimes called …………. diode

a)

A. Low resistance

b)

B. High resistance

c)

C. Single-base

d)

D, Double-base

25.

8) The UJT may be used as ……………….

a)

A. Am amplifier

b)

B. A sawtooth generator

c)

C. A rectifier

d)

D. None of the above

26.

9) 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.

An SCR is considered to be a semi controlled device because_____________

a)

it can be turned OFF but not ON with a gate pulse.

b)

it conducts only during one half cycle of an alternating current wave.

c)

it can be turned ON but not OFF with a gate pulse.

d)

it can be turned ON only during one half cycle of an AC.

28.

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

29.

A thyristor is basically_____

a)

PNPN device

b)

A set of SCRs

c)

A combination of diac and triac

d)

A set of SCR, diac and a triac

30.

If holding current of a thyristor is 2 mA then latching current should be____

a)

0.02

b)

0.001

c)

0.004

d)

0.002

31.

The Inverter can be classified as________

a)

Current Source Inverter

b)

Voltage Source Inverter

c)

Both Current Source & Voltage Source Inverter

d)

None of above

32.

In the ___________ type of chopper, two stage conversions takes place.

a)

AC-DC

b)

AC link

c)

DC link

d)

None of the mentioned

33.

A chopper is______

a)

Time ratio controller

b)

AC to DC converter

c)

DC transformer

d)

High speed semiconductor switch

34.

What is the duty cycle of a chopper?

a)

Ton/Toff

b)

Ton/T

c)

T/Ton

d)

Toff x Ton

35.

SMPS is used for

a)

obtaining controlled ac power supply

b)

switch from one source to another

c)

storage of dc power

d)

obtaining controlled dc power supply

36.

Power converters can change one form of power to another form of power using semiconductor power devices.

a)

True

b)

False

37.

To allow power conversion, we can arrange all power switches in the converter freely.

a)

True

b)

False

38.

How many directions can a semiconductor power switch conduct electric current?

a)

1

b)

2

c)

3

d)

4

39.

Which power switch needs a continuous control signal to remain turn-on?

a)

Diode

b)

Transistor

c)

Thyristor

40.

What is known as an "Inverter"?

a)

AC/DC Converter

b)

DC/AC Converter

c)

AC/AC Converter

d)

DC/DC Converter

41.

What is the correct statement about Buck Converters?

a)

Boosts a battery voltage from 200V DC to 500V DC.

b)

Step down the voltage from 500V AC to 200V DC.

c)

Step up voltage from 200V DC to 500V AC.

d)

Step down the voltage from 500V DC to 200V DC.

42.
[3 minutes] Fill in the blank .
Power Electronics  circuits involve______________ from one form to another using power semiconductor devices  (1 mark)
a)
converting mechanical power
b)
transfer heat
c)
converting electrical power
d)
converting electromagnetic field
43.
[3 minutes] The current gain, β of BJT is given by the expression (1 mark)
a)
IC/IB
b)
IC/IE
c)
IB/IC
d)
IE/IG
44.
[5 minutes] A single-phase half-wave type diode rectifier requires __________ number of diode(s) whereas full wave type requires _________ number of diode(s) (2 mark)
a)
4, 1
b)
1, 4
c)
1, 3
d)
3, 4
45.

The i-v characteristics of a power diode for large forward current is __________ .

a)

straight line

b)

linear

c)

nonlinear

d)

parabolic

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