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Electric motors Quiz 2
KLE Dr. M. S. Sheshgiri College of Engineering and Technology, Belagavi Department of Electrical And Electronics Engineering QUIZ -2 Code: 15EE44 Subject: Electric motors Semester: IV Date: 03/02/2018 Staff : Prof. Abhinay Gupta 1. The function of ____ in dc generator is to collect current from commutator and deliver it to external circuit Dummy Coils Brushes Equalizer rings End rings 2. In DC Motor speeds above the rated speed can be attained by varying which of the following winding current Either Filed winding or Armature winding Armature winding Field Winding 3. The main advantage of dc motors compared to ac motors are: (Choose multiple answers) High Starting Torque Speed Control Less Maintenance Low Cost 4. The emf produced in dc generator is ___ induced emf: Dynamically Statically Electrostaticall
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
ReplyDelete