MCQ

1. Reduction in core losses and increase in permeability are obtained with transformer employing (a) core built-up of laminations of cold rolled grain oriented steel (b) core built-up of laminations of hot rolled sheet (c) either of the above (d) none of the above 2.In a power or distribution transformer about 10 pm cent end […]

1. The reactance of a transformer depends on (a) size of the core (b) size of the tank (c) leakage flux (d) all of the above. 2. Which winding of the transformer has less cross-sectional area ? (a) Primary winding (b) Secondary winding (c) Low voltage winding (d) High voltage winding 3. Which of the

1.A voltage transformer of which class of accuracy can be used for precision testing in standard laboratories? (a) 0.1 class (b) 10 class (c) 5.00 class (d) 1000 class 2. In a transformer the tappings are generally provided on (a) primary side (b) secondary side (c) low voltage side (d) high voltage side 3. The

1. In a 50 kVA transformer the number of turns in the primary and secondary windings are 834 and 58 respectively. If the primary is connected to 3300 V supply the secondary current will be (a) 15 A (b) 30 A (c) 218 A (d) 238 A 2. If full load copper loss of a

1. In a power transformer (a) primary winding is closer to core (b) secondary winding is closer to core (c) low voltage winding is closer to core (d) high voltage winding is closer to core 2. In a transformer, the magnetic coupling between primary and secondary circuit can be increased by (a) increasing the number