The thickness of laminations used in a transformer is usually? Mark as favorite Copy Link 0.4 mm to 0.5 mm 4 mm to 5mm 14 mm to 15mm 25 mm to 40 mm Check Answer
In a transformer the resistance between its primary and secondary is? Mark as favorite Copy Link zero 1 ohm 1000 ohms infinite Check Answer
Which of the following loss in a transformer is zero even at full load? Mark as favorite Copy Link Core loss Friction loss Eddy current loss Hysteresis loss Check Answer
Which of the following properties is not necessarily desirable for the material for transformer core? Mark as favorite Copy Link Low hysteresis loss High permeability High thermal conductivity Adequate mechanical strength Check Answer
The efficiency of a transformer, under heavy loads, is comparatively low because? Mark as favorite Copy Link copper loss becomes high in proportion to the output iron loss is increased considerably voltage drop both in primary and secondary becomes large secondary output is much less as compared to primary input Check Answer
The full-load copper loss of a transformer is 1600W. At half-load, the copper loss will be? Mark as favorite Copy Link 6400 W 1600 W 800 W 400 W Check Answer
In some transformers, the tappings are provided on? Mark as favorite Copy Link L.V. side H.V. side L.V. as well as on H.V. side in the middle of both windings Check Answer
Which of the following protection is normally not provided on small distribution transformers? Mark as favorite Copy Link Overfluxing protection Buchholz relay Overcurrent protection All of the above Check Answer
The colour of fresh dielectric oil for a transformer is? Mark as favorite Copy Link dark brown white to grey pale yellow colourless Check Answer
Which of the following parts of a transformer is visible from outside? Mark as favorite Copy Link Bushings Core Primary winding Secondary winding Check Answer