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Worksheetspower electronics devices and rectifier
Total questions: 27
Worksheet time: 1hrs 28mins
Name
Class
Date
1.
What is Power Electronics?
a)
A field of Electrical Engineering that deals with design electronic circuits, devices, microprocessors, microcontrollers and other systems
b)
A field of Electrical Engineering that deals with the application of power semiconductor devices for the control and conversion of electric power.
c)
A field of Electrical Engineering that deals with the application of conventional magnetic component for the conversion of electric power.
d)
A field of Electrical Engineering that involves studies on power semiconductor devices material.
2.
Application of power electronics in static system is...
a)
to manipulate certain parameter for controlling the speed of motors.
b)
to convert electrical power for supplying load demand or for Power Quality (PQ) improvement.
3.
Application of power electronics in drive system is...
a)
to manipulate certain parameter for controlling the speed of motors.
b)
to convert electrical power for supplying load demand or for Power Quality (PQ) improvement.
4.
A Diode has .............
a)
two pn junction
b)
one pn junction
c)
three pn junction
d)
none of the above
5.
Diode...
a)
allows current to flow in one direction
b)
allows current to flow in two directions
c)
is a resistor
d)
is a controlled switch
6.
When the diode current is large, the bias is …………
a)
Forward
b)
Reverse
c)
Forward and Reverse
d)
None of the above
7.
Which diode has less forward voltage drop
a)
Silicon Diode
b)
Schottky Diode
c)
Zener Diode
d)
LED
8.
The forward voltage drop across a silicon diode is about …………………
a)
2.5V
b)
3V
c)
0.3V
d)
0.7V
9.
Diode is used as a half wave rectifier.
a)
It rectifies only one half of the input AC signal
b)
It rectifies both the halves of the input AC signal
10.
Diode is used as a full wave rectifier.
a)
It rectifies only one half of the input AC signal
b)
It rectifies both the halves of the input AC signal
11.
Three types of common transistor are...
a)
Diode, Triac and IGBT
b)
IGBT, MOSFET and GTO
c)
Diode, IGBT and GTO
d)
BJT, MOSFET and IGBT
12.
What are the two types of MOSFETs used in a circuit?
a)
Source and Drain
b)
N-type and P-type
c)
Current and Voltage
d)
N-type and M-type
13.
What is NOT the name of a pin on a MOSFET?
a)
Source
b)
Drain
c)
Gate
d)
Power
14.
What physical circuit component that you learned about today does a MOSFET act like?
a)
Resistor
b)
LED
c)
Switch
d)
Breadboard
15.
Name this electronic component
a)
Capacitor
b)
Fixed Resistor
c)
Potentiometer
d)
Transistor
16.
Switching operation of BJT are....
a)
Turn-on by apply VGS +15 V. Turn-off by apply VGS 0 V.
b)
Turn-on by inject + or - IB for NPN or PNP base terminal. Turn-off by remove IB.
c)
Turn-on by apply +VGE +15 V. Turn-off by apply VGE 0 V.
17.
Switching operation of MOSFET are....
a)
Turn-on by apply VGS +15 V. Turn-off by apply VGS 0 V.
b)
Turn-on by inject + or - IB for NPN or PNP base terminal. Turn-off by remove IB.
c)
Turn-on by apply +VGE +15 V. Turn-off by apply VGE 0 V.
18.
Switching operation of IGBT are....
a)
Turn-on by apply VGS +15 V. Turn-off by apply VGS 0 V.
b)
Turn-on by inject + or - IB for NPN or PNP base terminal. Turn-off by remove IB.
c)
Turn-on by apply +VGE +15 V. Turn-off by apply VGE 0 V.
19.
What is the purpose of BJT?
a)
control the direction of the current
b)
Store energy
c)
Amplify the current
d)
opposed to the flow of the current depending on the temperature
20.
A fully controlled converter uses....
a)
diodes only
b)
thyristors only
c)
both diodes and thyristors
d)
None of them
21.
What kind of rectification it is ?
a)
Full wave
b)
Half wave
c)
Bridge Full-Wave Rectifier
d)
two pulse in one cycle rectification
22.
What kind of rectification it is ?
a)
Full wave
b)
Half wave
c)
Bridge Full-Wave
d)
two pulse in one cycle rectification by bridge
23.
A 50 Hz single-phase half-wave rectifier is connected to an RL load of 7 Ohms and 6 mH. If Vs = 230 Vrms, Calculate the extinction angle,.β
a)
190.0511 radian
b)
195.0711 degree
c)
195.0711 radian
d)
190.0511 degree
24.
A 50 Hz single-phase half-wave rectifier is connected to an RL load of 7 Ohms and 6 mH. If Vs = 230 Vrms, calculate the mean load voltage. Given extinction angle, β =195.07 degree.
a)
106.18 V
b)
101.16 V
c)
101. 55 V
d)
101.76 V
25.
A 50 Hz single-phase half-wave rectifier is connected to an RL load of 7 Ohms and 6 mH. If Vs = 230 Vrms, calculate the rms load voltage . Given extinction angle, β =195.07 degree.
a)
162.944 Vrms
b)
166. 44 Vrms
c)
16.29 Vrms
d)
106. 44 Vrms
26.
A 50 Hz single-phase half-wave rectifier is connected to an RL load of 7 Ohms and 6 mH. If Vs = 230 Vrms, calculate the mean load current . Given extinction angle, β =195.07.
a)
17 A
b)
13.75A
c)
14.54 A
d)
12.66 A
27.
A 50 Hz single-phase half-wave rectifier is connected to an RL load of 7 Ohms and 6 mH. If Vs = 230 Vrms, calculate the rms load current . Given extinction angle, β =195.07.
a)
21.22 A
b)
23.75 A
c)
19.94 A
d)
22.54 A
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