CL wadhwa bits solutions (155-159)

Lesson 8 of 26 • 28 upvotes • 14:31mins

Anvesh Sameer

155. The minimum oil circuit breaker has less volume of oil because: (a) There is insulation between contacts (b) The oil between the breaker contacts has greater strength (c) Solid insulation is provided for insulating the contacts from earth (d) None of the above is true.

     156. Load flow study is carried out for (a) Fault calculations (b) Stability studies (c) System planning (d) Load frequency control. 157. Arcing on transmission lines is prevented by connecting a suitable (a) Circuit breaker (b) Protective relay (c) Inductor in the neutral (d) Capacitor in the neutral. 158. The in-rush current of a transformer at no load is maximum if the supply voltage is switched on (a) At zero voltage value (b) At peak voltage value (c) At V/2 value (d) At 3 /2 V value. 159. If the loading of the line corresponds to the surge impedance loading the voltage at the receiving end is (a) Greater than sending end (b) Less than sending end (c) Equal to the sending end (d) None of the above is necessary.