EE6351 ELECTRICAL DRIVES AND CONTROL Important questions
EE6351 ELECTRICAL DRIVES AND CONTROL Important questions Regulation 2013 Anna university free download. EE6351 Important questions ELECTRICAL DRIVES AND CONTROL free pdf download.
Sample EE6351 ELECTRICAL DRIVES AND CONTROL Important questions:
1. What is a controlled rectifier?
A controlled rectifier is a device which is used for converting controlled dc power
from a control voltage ac supply.
2. What is firing angle?
The control of dc voltage is achieved by firing the thyristor at an adjustable angle
with respect to the applied voltage. This angle is known as firing angle.
3. Give some applications of phase control converters.
(EE6351 ELECTRICAL DRIVES AND CONTROL Important questions)
4. What is the main purpose of free wheeling diode?
6. What is natural or line commutation?
The commutation which occurs without any action of external force is called natural or line commutation.
7. What is forced commutation?
The commutation process which takes place by the action of an external force is
called forced commutation.
8. What is a chopper?
A chopper is essentially an electronic switch that turns on the fixed-voltage dc source for a short time intervals and applies the source potential to motor terminals in series of pulses.
(EE6351 ELECTRICAL DRIVES AND CONTROL Important questions)
A full converter is a tow quadrant converter in which the voltage polarity of the
output can reverse, but the current remains unidirectional because of unidirectional thyristors.
5. What is a full converter?
Free wheeling diode is connected across the motor terminal to allow for the
dissipation of energy stored in motor inductance and to provide for continuity of motor current when the thyristors are blocked. Phase control converters are used in the speed control of fractional kW dc motors as well as in large motors employed in variable speed reversing drives for rolling mills. with
motors ratings as large as several MW‟s.
(EE6351 ELECTRICAL DRIVES AND CONTROL Important questions)
| Subject Name | Electrical Drives and Control |
| Subject Code | EE6351 |
| Regulation | 2013 |
| File |
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