162. In each of the three coils of a three phase generator, an alternating voltage having an r.m.s. value of 220 V is induced. Which of the following values is indicated by the voltmeters?

A. 220 V

B. 220 j V

C. 220Z V

D. none of the above

163. Which of the following equations is valid for a balanced load on a starts circuit with a neutral conductor in a four wire star circuit?

A. IN = IR Iy + IB =

B. IN = IR ? Iy + IB

C. IN = IR + ly ?IB

D. IN = (VR + Vy + VB)/R

164. The true power drawn by a balanced three-phase consumer for line voltage V and line current I is given by

A. V I cos 4)

B.v I cos 4)

C. 3 V I cos

D.V I

165. . An electric iron designed for 110 V A.C. supply was rated at 500 W. It was put across a 220 V supply. Assuming that at 110 V it supplied 500 W output, (i.e., no losses) at the new voltage it will supply

A. 2500W

B. 2000 W

C. 500 W

D. 250 W

166. From the Fig. 5.16 it can be concluded that

A. v leads i by n/2

B. v lags i by it/2

C. v leads i by n

D. v lags i by n

167. A coil is connected across a 200 V, 50 Hz supply and takes a current of 10 A. The loss in the coil is 1000 W. The impedance and resistance of the coil are

A. 10 L-1, 8 S-2

B. 15 0, 8 L2

C. 20 12, 10

D.301, 151k

168. In an A.C. circuit (sine wave) with R and L in series

A. voltage across and L are 180? out of phase

B. the voltage across R lags the voltage across L by 90?

C. the voltage across R leads the voltage across L by 90?

D. voltage across R and L are in phase

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