WorksheetsPOWER ELECTRONICS-Q1 (January 2019)
Total questions: 16
Worksheet time: 12mins
Name
Class
Date
1.
Material that electricity can easily flow through
a)
Insulators
b)
Rubber
c)
Conductor
d)
Wood
2.
Identify the Converter type?
a)
1Φ Dual Converter
b)
3Φ Single Converter
c)
3Φ Dual Converter
d)
1Φ Single Converter
3.
A fully controlled converter uses
a)
diodes only
b)
thyristors only
c)
both diodes and thyristors
d)
Noe of them
4.
In the single-pulse width modulation method, the output voltage waveform is symmetrical about __________ ?
a)
π
b)
2π
c)
π/2
d)
π/4
5.
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
6.
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
7.
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
8.
The shape of the output voltage waveform in a single PWM is
a)
square wave
b)
triangular wave
c)
quasi-square wave
d)
sine wave
9.
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
10.
The time constant of a series RC circuit (τ) is given by
a)
R/C
b)
C/R
c)
RC
d)
1/RC
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.
Static UPS requires...?
a)
Only Rectifier
b)
Only Inverter
c)
Both Rectifier & Inverter
d)
None
14.
PWM in voltage source inverter can control ----------------------- of the voltage output ?
a)
Frequency
b)
Magnitude
c)
Both Frequency & Magnitude
d)
None
15.
Generally for a pure Inductive load what is the impedance angle φ?
a)
120 degree
b)
90 degree
c)
180 degree
d)
270 degree
16.
Which device can be used in a chopper circuit?
a)
GTO
b)
IGBT
c)
MOSFET
d)
ALL
100 %
