Which chopper is also called as four quadrant chopper?
Type E chopper
What is meant by RLE
load?
It is simple motor load in which E indicates back emf
of the motor.
Which chopper is also
called as two quadrant chopper?
Type B chopper and type C chopper
Which type of chopper
configuration is used in the Jones chopper?
Type D chopper
Which circuit provides
commutation for the Jones chopper?
The auxiliary SCR, capacitor C, diode and auto
transformer provide commutation circuit for the Jones chopper.
Which circuit provides
commutation for the Morgan chopper?
The capacitor, saturable reactor and diode provide
commutation circuit for the Morgan chopper.
Comment on the value of
the inductance pre saturation and post saturation of the saturable reactor
The value of inductance before saturation of the
saturable reactor is high whereas its value is low post saturation.
How many thyristors the
load commutated chopper consists of?
Four
Describe the advantages
of the load commutated chopper.
Advantages
No commutating inductor requires
No noise
Less costly
Low weight
It can operate at high frequency therefore minimum
requirement of filter
Commutates any amount of current
Describe the
disadvantages of the load commutated chopper.
Disadvantages of load commutated chopper
High switching losses at high frequency
Low efficiency in high power applications
The peak voltage is twice the supply voltage but it
can be reduced by filtering
The voltage across freewheeling diode is twice the
supply voltage therefore fast recovery diode must be used.
Explain the term : Multi
phase chopper
Multi phase
chopper
It is a chopper which consists of two or more than
two choppers operating at same frequency and proper phase shift
Describe the operating
modes of the multi-phase choppers
Operating mode of the
choppers
Phase shift mode
In phase mode
Describe the function of
source filter in the chopper circuit
Function of source
LC filter in the chopper circuit
The LC filter is connected between supply source and
chopper. The LC filter reduces
Harmonics
Source voltage fluctuation
Signal interference
Supply distortion
State the application of
the DC Choppers
Applications
Marine hoists
Speed control of induction motor
Traction motor control
Battery operated vehicles
Trolley car
No comments:
Post a Comment