1
|
Describe the function of the DC choppers.
|
Function
of the DC choppers
|
|
2
|
What are the different technologies to convert fixed direct
voltage into variable direct voltage?
|
Fixed
direct voltage in variable direct voltage
|
|
3
|
Describe the advantages of DC choppers over motor – generator
set.
|
Advantages
of the DC choppers
|
|
4
|
Describe the various types of the DC chopper.
|
According to
output voltage
According to
the direction of output voltage and current
According to
commutation method
|
|
5
|
Which type of semiconductor device is used as switch in the DC
chopper circuit?
|
Semiconductor
device as a switch
|
|
6
|
Explain the term : Step up chopper, Step down chopper
|
Step
up chopper
Step
down chopper
|
|
7
|
Define : Duty cycle
|
Duty
cycle
K = TON / T
K = Duty cycle
TON
= Chopper turn on time
T = Chopper switching time
|
|
8
|
Which is main factor responsible for control of the output
voltage of the chopper?
|
Duty cycle
|
|
9
|
Describe the various methods of output voltage control in the
chopper.
|
Method
of chopper output voltage control
|
|
10
|
In which method of voltage control chopping frequency is kept
constant in the chopper?
|
Constant
frequency control ( Pulse width modulation control )
|
|
11
|
Describe the disadvantages of the frequency modulation voltage
control over the pulse width modulation voltage control.
|
Disadvantages
of the frequency modulation voltage control over the pulse width modulation
voltage control
|
|
12
|
Describe the disadvantage of current limit control in the DC
chopper
|
Disadvantages
of current limit control
|
|
13
|
Why higher value of inductor is preferred for step up chopper?
|
In order to
reduce output voltage ripple
|
|
14
|
Write the relation between input and output voltage in the
step down chopper, step up chopper and step up / down chopper.
|
Relation
between output voltage and input voltage
Step down
chopper
Step up
chopper
Step up / down
chopper
Where VO
= Output voltage
VIN = Input voltage
K = Duty cycle
The chopper
works as step down chopper if 0 < K
< 0.5 . The chopper works as step up chopper if 0.5 < K < 1.
|
|
15
|
Why the operation of the chopper in the first quadrant is
called as forward drive?
|
The output
voltage and output current of the chopper is positive therefore the operation
of the chopper in the first quadrant is called as forward drive.
|
|
16
|
Why the type A chopper is called as step down chopper?
|
Type
A chopper ( Step down chopper )
|
|
17
|
Which chopper works in the second quadrant?
|
Type B chopper
|
|
18
|
Why the type B chopper is called as step up chopper?
|
Type
B chopper ( Step up chopper )
|
|
19
|
Which chopper configuration is used in the regenerative
braking?
|
Type B chopper
|
|
20
|
Which chopper is parallel combination of type A and type B
chopper?
|
Type C chopper
|
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