13. Transformers are rated in kVA instead of kW because :
(a) load power factor is often not known (b) kVA is fixed whereas kW depends on load p.f. (c) total transformer loss depends on voltampere (d) it has become customary
Answer
Answer : (c)
Explanation
Explanation : No answer description available for this question. Let us discuss.
Transformer » Exercise - 18. If the primary power of an ideal transformer having a 2:1 voltage ratio is 100 W, the secondary power is : (a) 50 W (b) 75 W (c) 100 W (d) 200 W
Transformer » Exercise - 13. In an ideal transformer : (a) windings have no resistance (b) core has no losses (c) core has infinite permeability (d) all of the above
Transformer » Exercise - 16. A transformer having 1000 primary turns is connected to a 250-V a.c. supply. For a secondary voltage of 400 V, the number of secondary turns should be : (a) 1600 (b) 250 (c) 400 (d) 1250
Transformer » Exercise - 12. Which of the following is not a basic element of a transformer ? (a) core (b) primary winding (c) secondary winding (d) mutual flux