Power Transformer MCQS Part 15

141. The output voltage E11 will be
a. 200 V
b. 133 V
c. 20 V
d. 353 V

142. The output voltage E12 will be
a. 200 V
b. 133 V
c. 103 V
d. 83 V

143. The output voltage E13 wil be
a. 10 V
b. 20 V
c. 40 V
d. 80 V

144. The total output voltage if all three secondary windings were connected series-aiding will be
a. 200 V
b. 200 X 133 X 20 V
c. 353 V
d. 353 under root 2 V

145. In the above case the total primary current will be
a. 400 mA
b. 666 mA
c. 705 mA
d. 795 mA

146. The load voltage for a resistor load of 8 ohms an input of 16 V at 1 kHz will be
a. 12.8 V
b. 8.2 V
c. 6.4 V
d. 3.2 V

147. Under no load conditions the secondary voltage will be
a. 6.4 V
b. 12 V
c. 10 V
d. 3.2 V

148. The mutual inductance M will be
a. 1 mH
b. 0.96 mH
c. 0.75 mH
d. 0.5 mH

149. Which of the following can be reduced when the flux density in the transformer core is increased
a. size of transformer
b. output frequency
c. wave shape distortion
d. copper iosses

150. In a three phase transformer the phase difference between the primary and the induced secondary winding is
a. 90 degree
b. 120 degree
c. 180 degree
d. 360 degree

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