A) 24 with centre tap B) 24 with no centre tap C) 220 with centre tap D) 12 with centre tap. Ans : (A)
A) Phase shift is always 180 B) Secondary current is always more than primary current C) Secondary turns are less than primary turns D) Secondary power is less than primary power. Ans : (C)
A) load current and voltage B) load current C) load current, voltage frequency and power factor D) load current, voltage and frequency. Ans : (B)
A) 50 % B) 75 % C) 90 % D) 100 %. Ans : (B)
A) Impedance test B) Core insulation voltage test C) Radio interference test D) Polarity test. Ans : (C)
A) 100 W B) 200 W C) 400 W D) 1600 W. Ans : (C)
A) windage losses less than copper losses B) windage losses more than iron losses C) iron losses greater than copper loses D) copper losses greater than iron losses. Ans : (D)
A) High conducting B) Low resistance C) High reluctance D) Low reluctance. Ans : (D)
A) 600 W B) 1000 W C) 1100 W D) 1400 W. Ans : (A)
A) Furnace transformer B) Welding transformer C) Oil cooled transformer D) Air cooled transformer Ans : (C)