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No load test of induction motor is carried out to compute= A stator resistance B rotor resistance C magnetizing reactance D rotor reactance
1 5213Short circuit test of induction motor is carried out to compute= A stator resistance B rotor resistance C magnetizing reactance D stator reactance
2 6418Auto transformer starter gives the same effect as star/delta strater if its turn ratio = A 0.5 B 0.67 C o.66 D 0.577
1 3817Rotor resistance starter is used to obtain= A increased starting torque B decrease starting current C decrease starting loss D increase efficiency
1 2775Plugging is a phenomenon to= A braking the motor B to accelerate the motor C to run IM as generator D to start the motor
3094During regenerative breaking= A rotating magnetic field is reversed B slip is positive C torque is positive D slip is negative
2130In which of the following case, the rotating magnetic field is reversed? A regenerative breaking B plugging C dynamic breaking D forward motoring
197029 Which of the following breaking method save energy? A regenerative breaking B plugging C dynamic breaking D none of above
1 3852Electromagnetic torque developed by the motor is compared to shaft torque. A less B same C depends on motor design D more
3 6332Electromagnetic torque developed by the motor is compared to shaft torque. A less B same C depends on motor design D more
2037An 8 pole, 50 Hz, 3-phase IM is loaded to a poing where pull out torque will occur. The rotor resistance per phase is 0.3 ohm and motor stalls at 650 rpm. The rotor reactance at stand still is A 2 ohm B 1.25 ohm C 3.15 ohm D 2.25 ohm
2285An 8 pole, 50 Hz, 3-phase IM is loaded to a poing where pull out torque will occur. The rotor resistance per phase is 0.3 ohm and motor stalls at 650 rpm. The slip when motor stalls is A 1 B 0 C 13.33% D 10.33%
1936An 8 pole, 50 Hz, 3-phase IM is loaded to a poing where pull out torque will occur. The rotor resistance per phase is 0.3 ohm and motor stalls at 650 rpm. The rotor frequency at maximum torque point is A 3.33% B 4.44% C 5.55% D 6.66%
1 3798In an ideal transformer no load primary current I0 A lags behind V1 by 90 degree B is in the phase with V1 C leads V1 by 90 degree D lags V1 by 45 degree
1 5338Post New Electrical Engineering Questions
What is the end effect of linear induction motor ??
draw vector diagram and +ve,zero sequence diagram of symmetrical three phase fault.
What kind of preventive maintenance are there for transformer?
hi if anybody got model questions for cpcl Grade'A' electrical engineer position.send it to my mail please krishkumar22@gmail.com
Dear sir, How to calculate 3.5 core pvc aluminium armoured cable meter wise carrying amps rating.Please give the solution with a good example.
CBCT selection
if the motor rated speed is 950rpm. how to change the above rated speed? is it possible?
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I'm looking for a mnaual set for a Teradyne J750. Softcopy would be preferred but I'll take what I can get.
sir plz send some previous year questions of jspl.
I NEED RRB SYLABUS FOR JE ELECTRICAL ,PLEASE SEND TO MY E- MAIL ID joo28_eee@yahoo.co.in
what is the difference between an alternator and a synchronous motor
I need the list of Universities who have summer intake for BS degree in Electrical Engineering.?
how you taken aotitude test
