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Power Electronics

Total questions: 50

Worksheet time: 28mins

Name
Class
Date
1.

Fill in the blank . Power Electronics  circuits involve______________ from one form to another using power semiconductor devices 

a)
converting mechanical power
b)
transfer heat
c)
converting electrical power
d)
converting electromagnetic field
2.

Application of power electronics in static system is......

a)
to convert electrical charge for supplying load demand or for Power Quality (PQ) improvement.
b)
to convert electrical power for supplying load demand or for Power Quality (PQ) improvement.
c)
to manipulate certain parameter for controlling the weight of motors.
d)
to manipulate certain parameter for controlling the speed of motors.
3.

How to increase the current conducting capability of diode?

a)
connect several diodes in parallel
b)
connect several diodes in series
4.

The controlling parameter in MOSFET is the......

a)
IG
b)
VGS
c)
ID
d)
VGE
5.

Which of the following statement is correct for an SCR operating in REVERSE BLOCKING MODE - practical condition

a)
leakage current flows from anode to cathode
b)
no leakage current
c)
leakage current flows from cathode to gate
d)
leakage current flows from cathode to anode
6.

Three types of common  power transistor are.....

a)
Diode, Triac and IGBT
b)
BJT, MOSFET and IGBT
c)
Diode, IGBT and GTO
d)
GTO, MOSFET and IGBT
7.

A single-phase half-wave type diode rectifier requires __________ number of diode(s) whereas full wave type requires _________ number of diode(s)

a)
4, 1
b)
1, 4
c)
1, 3
d)
3, 4
8.

For a certain diode based rectifier, the output voltage (average value) is given by the equation 1/2π ∫Vm sin (ωt) dωt ; where the integral (∫) runs from 0 to π. The rectifier configuration must be that of a....

a)
single phase controlled full wave with R load
b)
single phase uncontrolled full wave with R load
c)
single phase uncontrolled half wave with RL load
d)
single phase uncontrolled half wave with R load
9.
[5 minutes] A single-phase full wave rectifier is a..... (2 marks)
a)
multiple pulse rectifier
b)
single pulse rectifier
c)
two pulse rectifier
d)
three pulse rectifier
10.

With respect to the given circuit, from ωt = 0 to α, thyristors _____________ block the forward voltage.

a)
T1, T2
b)
T3, T4
c)
T1, T3
d)
T2, T4
11.

Fill in the blank . Power Electronics  circuits involve______________ from one form to another using power semiconductor devices 

a)
converting mechanical power
b)
transfer heat
c)
converting electrical power
d)
converting electromagnetic field
12.

Application of power electronics in drive system is...... (2 marks)

a)
to convert electrical charge for supplying load demand or for Power Quality (PQ) improvement.
b)
to convert electrical power for supplying load demand or for Power Quality (PQ) improvement.
c)
to manipulate certain parameter for controlling the weight of motors.
d)
to manipulate certain parameter for controlling the speed of motors.
13.

Choppers is..................converter

a)

AC -DC

b)

DC-AC

c)

AC-AC

d)

DC-DC

14.

A chopper may be thought as a

a)

Inverted with DC input

b)

DC equivalent of an AC transformer

c)

Diode rectifier

d)

DC equivalent of an induction motor

15.

Which device can be used in a chopper circuit?

a)

BJT

b)

MOSFET

c)

GTO

d)

ALL THE ABOVE

16.

What is the duty cycle of a chopper ?

a)

Ton/Toff

b)

Ton/T

c)

T/Ton

d)

Toff x Ton

17.

The load voltage of a chopper can be controlled by varying the..................

a)

duty cycle

b)

firing angle

c)

reactor position

d)

extinction angle

18.

In a half wave bridge inverter circuit, the power delivered to the load by each source is given by

a)

2(Vs x Is)

b)

Vs x Is

c)

(Vs x Is)/2

d)

None of the mentioned

19.

The series-inverter control method is a/an..........

a)

external frequency control method

b)

external voltage control method

c)

internal voltage control method

d)

none of the mentioned

20.

A single full converter alone can given a

a)

two quadrant operation

b)

three quadrant operation

c)

four quadrant operation,

d)

none of the mentioned

21.

Choose the correct statement

a)

Circulating current exists only in circulating current mode

b)

Circulating current exists in both the circulating and non-circulating current mode

c)

Circulating current exists only in non-circulating current mode

d)

none of the mentioned

22.

The process of commutating a SCR by applying a reverse voltage to an SCR through a previously charged capacitor is called as

a)

capacitor commutation

b)

forced commutation

c)

voltage commutation

d)

current commutation

23.

In case of current commutation of SCR

a)

a diode is connected in parallel with the main SCR

b)

a diode is connected in anti-parallel with the main SCR

c)

a diode is connected in series with the main SCR

d)

none of the mentioned

24.

AC voltage controllers convertr is

a)

fixed ac to fixed dc

b)

variable ac to variable dc

c)

variable ac to fixed ac

d)

fixed ac to variable ac

25.

In AC voltage controllers the

a)

variable ac with fixed frequency is obtained

b)

variable ac with variable frequency is obtained

c)

variable dc with fixed frequency is obtained

d)

variable dc with variable frequency is obtained

26.

The AC voltage controllers are used in __________ applications.

a)

electric heating

b)

power generation

c)

conveyor belt motion

d)

power transmission

27.

In the principle of phase control

a)

control is achieved by adjusting the firing angle of the devices

b)

the load is on for some cycles and off for some cycles

c)

control is achieved by adjusting the number of on off cycles

d)

control cannot be achieved

28.

In the circuit shown in figure

a)

only the negative cycle can be controlled

b)

only the positive cycle can be controlled

c)

both the cycles can be controlled

d)

none of the mentioned

29.

Application of Choppers including;


i. DC motor Drives

ii. trolley cars

iii. battery operated vehicles

iv. Switch mode power supply

a)

i & iii

b)

i & iv

c)

i, ii & iii

d)

i, ii, iii & iv

30.

The Circuit Diagram is ideal circuit for

a)

Buck Converter

b)

Boost Converter

c)

Buck-boost Converter

31.

Identify two methods that used in controlling the switch in a chopper circuit.

a)

Pulse Width modulation (PWM)

b)

Phase angle Control

c)

Variable Frequency Control

d)

Square Wave Switching

32.

SCR is defined as ...............

a)

Silicone Cup Rectifier

b)

Supply Controlled Rectifier

c)

Silicone Controlled Rectifier

d)

Shorted Controlled Rectifier

33.

Which is the symbol of SCR?

a)
b)
c)
d)
34.

Terminals of SCR are ..........

a)

Anode and Cathode

b)

Collector, Base and Emitter

c)

Anode, Cathode and Gate

d)

Drain, Source and Gate

35.

Power Electronics can be defined as ...........

a)

A conversion from Alternating Current to Direct Current of Power Supply

b)

A conversion of DC power supply to AC power supply

c)

A conversion of AC power supply to AC power supply

d)

A technology of converting electric power from one supply to another supply using electronic power devices.

36.

The electronic devices below are unidirectional devices EXCEPT:

a)

TRIAC

b)

Diode

c)

Silicone Controlled Rectifier

37.

Diode pass ......... in one direction?

a)

a) Voltage

b)

b) Current

c)

c) Both

d)

d) None of these

38.
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
39.

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

40.

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

41.

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

42.

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

a)

True

b)

False

43.

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

a)

Thyristor

b)

Triac

c)

GTO

d)

MOSFET

44.

A thyristor equivalent of a thyratron tube is a

a)

DIAC

b)

TRIAC

c)

Silicon controlled rectifier

d)

BJT

45.

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

46.

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

47.
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
48.

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

a)

SiO2

b)

O2

c)

Si

d)

None

49.

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

50.

Which of the following circuits will light up the bulb?

a)

A

b)

B

c)

C

d)

D

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