QUIZ-I (Electric Motors)
QUIZ -I Code: 15EE44 Subject: Electric motors Semester: IV Date: 03/02/2018 Staff : Prof. Abhinay Gupta 1. The speed of a DC motor is ….. directly proportional to back emf directly proportional to flux inversely proportional to product of flux and back emf always constant 2. As the load on DC shunt motor increased, its speed ….. increases slightly remains constant increases proportionately reduces slightly 3. In a dc motor, unidirectional torque is produced with the help of ……. end plates both brushes and commutator commutator brushes 4. The starting resistance of DC motor is usually ………….. 200 ohm infinitely large large small 5. T he DC Motor which has approximately constant speed …… shunt motor cumulatively compound motor series motor differently compound motor 6
What is the use of Breather in transformers?
ReplyDeleteThe purpose of breather is to absorb the moisture during breathing
ReplyDeleteWhat method of speed control of a DC machine can a domestic consumer use without any hassle?
ReplyDeleteThe method is aramature voltage control with help of rheostat, this would be the cheapest in terms of economy but if the utilization factor is high then power converter are the best for the control
DeleteHow is working of a sf6 Circut breaker compared to air or vacuum breaker in terms of economy,used for LV switching upto 110kv
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