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Electromagnetic torque developed by the motor is compared to shaft torque. A less B same C depends on motor design D more
2040An 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
2288An 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%
1937An 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 3800In 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 5347Transformer cores are laminated in order to A simplify its construction B minimize eddy current loss C reduce cost D reduce hysterisis loss
3281A transformer has negative voltage regulation when its load PF is A zero B unity C lagging D leading
1 8178Essential condition for parallel operation of two single phase transformer is that they should have same A polarity B kVA rating C voltage ratio D % impedance
1 11370Saving in copper achieved by converting a 2 winding transformer in to an auto transformer is determined by A voltage transformation ratio B load on secondary C quality of core material D size of transformer core
3153kVA rating of ordinary transformer is increased when connected as an auto transformer because A transformation ratio increased B secondary voltage increased C energy is transferred both inductively and conductively D secondary current increased
2665At light load transformer efficiency is less because A secondary output is low B transformer losses are high C fixed loss is high compared to output D copper loss is small
1 5819Which of the following connection is best suited for 3-ph, 4 wire system A delta-delta B star-star C delta-star D star-delta
2 9986A T-T transformer can not be parallel with transformer A V-V B star-delta C star-star D delta-delta
1 6517Following test should be conducted to find out relative polarity of transformenr terminals A no load test B back to back test C phasing out test D none of above
2225In power transformer tappings are provided on A high voltage side B low voltage side C In middle of both the windings D both high and low voltage side
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2 5384
State how to produce a constant rotating field by application of alternating currents to stator armature of a three-phase squirrel-cage induction motor
Draw the space diagram for a ten meter long beam simply supported at each end. At 4 meters from the left hand end is a load of 25kn and three meters from the other end. Also draw the shear force and the bending moment diagrams, showing the necessary calculations.
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Do you know what is ansi?
Dear Sir, Please send me the questions frequently asked during bhel persoal interview for supervisor trainee With worm regards, Alok Kumar Rout e-mail id- rjdalok22@gmail.com
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