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What is the polarity of an AC source?
(A) Positive to ground (B) Negative to positive

(C) Positive to negative (D) Change at regular intervals

What is the standard domestic supply voltage in India as per Indian standard?
(A) 240 V (B) 230 V
(०) 220 ४ (೧) 250 ४

Why AC transmission is preferred to long distance than DC?
(A) Less line losses (B) It is easily available

(C) Easy to carry high current (D) Current carrying capacity is more

How much time is required by 50Hz AC supply to complete one cycle?
(A) 0.1 second (B) 0.02 second
(C) 0.15 second (D) 0.45 second

What is the equation used to calculate the effective value (4) of voltage in a wave?
(A) Ving = 9-707 Vay )8( ۷,۶ 0-637 ‏مولا‎
‎(©) Ving = 1114 ‏مولا‎ (D) Ving = 1-414 ५/०

x

x

In an A.C. circuit, a low value of KVAR compared with kW indicates
(A) Unity ‏ما‎ (B) High pf.
(C) Low efficiency (D) None of these

In an A.C. circuit, the ratio of KW/kVA represents −

(A) Form factor (B) Power factor
(C) Load factor (D) None of these

In A.C. circuits, laminated iron is used to −

(A) Reduce eddy current loss (B) Reduce circuit permeability

(C) Make assembly cheap (D) Increase heat radiation

An alternating current or voltage is that which
(A) Changes in direction only

(B) Changes in magnitude only

(C) Changes in both magnitude and direction

(D) Has a random movement of electrons

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