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Transformer cores are laminated in order to A simplify its construction B minimize eddy current loss C reduce cost D reduce hysterisis loss
3346A transformer has negative voltage regulation when its load PF is A zero B unity C lagging D leading
1 8243Essential 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 11469Saving 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
3241kVA 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
2745At 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 5894Which 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 10097A T-T transformer can not be parallel with transformer A V-V B star-delta C star-star D delta-delta
1 6571Following 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
2275In 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
NNN,
2 5502Main advantage of auto transformer over two windings transformer is that A it needs no cooling B it uses only one winding C core losses are reduced D it has simple construction
2990Material commonly used in making transformer core is A cast iron B mild steel C high silicom steel D high carbon steel
1 3642If we impress a dc voltage of 230 V on an unloaded 230 V, 50 Hz transformer it wi A give high secondary voltage B burn out C give secondary voltage as per K D none of these
2071If we impress a dc voltage of 230 V on an unloaded 230 V, 50 Hz transformer it wi A give high secondary voltage B burn out C give secondary voltage as per K D none of these
1 3349Short circuit voltage of a transformer mainly depend on A ohmic resistance of primary B ohmic resistance of secondary C magnitude of leakage flux D cross sectional area of core
1 9685Post New Electrical Engineering Questions
How to megger test 11 kV cable and the acceptance IR value
What is effect of harmonic current (Draw by VFD) on power system/ electrical Equipments ?
what is the importance of earthing system on the generators big capacity and small?
what is level 2 automation?
how we provide neutral earth on synchronising panel as per electrical standards?
Define cuttoff frequency?
Why and when NGR panel required. Is it necessary to design a NGR panel for a 6.6kV Alternator paralleling with Grid????
If i am running of spindle at 2000rpm ,but How to spindle stop at the second I am resetting the machine in CNC machines
direction of tarbine& genrator
What is the limitation of kirchoffs law?
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What is the use of lag compensator?
How the PF control while running DG set with load
working principles of cf lamp,incandescentlamp and f lamp?
What tests should i carry over on a newly rewinded DC Generator with voltage rating of 38 volts and current rating of 350 amps, to certify that the machine is OK?
