Power Generator

161. The voltage regulation of an alternator with a power factor of 0.8 lagging is ___________ at unity power factor

1. greater than
2. the same as
3. smaller than
4. 100%

View answer

162. The winding of the transformer with greater number of turns will be

1. high voltage winding
2. low voltage winding
3. either high or low voltage winding
4. high power

View answer

163. The yoke of a dc machine carries ___________ poke flux

1. one third of
2. two times of
3. one half of
4. one fourth of

View answer

164. The yoke of a dc machine is made of

1. silicon steel
2. aluminium
3. soft iron
4. cast steel

View answer

165. This synchronous reactance of an alternator is generally ___________ armature resistance

1. 5 times smaller than
2. 10 - 100 times greater than
3. 5 times greater than
4. 10 times smaller than

View answer

166. Three cells connected in series from a

1. battery
2. voltage divider
3. voltage multiplier
4. hybrid

View answer

167. To increase current capacity, cells are connected in

1. parallel
2. series
3. series- parallel
4. parallel- series

View answer

168. To increase the voltage output, cells are connected in

1. parallel
2. series-parallel
3. parallel-series
4. series

View answer

169. To produce an output of 7.5v, how many carbon zinc cells are connected in series?

1. 4
2. 5
3. 6
4. 3

View answer

170. Transformers having ratings less than 5kva are generally

1. oil cooled
2. water cooled
3. natural air cooled
4. self cooled

View answer