Power Generator

181. When the load on a transformer is increased, the eddy current loss

1. is decreased
2. remains the same
3. is increased
4. becomes zero

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182. When the load on an alternator is increased, the terminal voltage increases if the load power factor is

1. unity
2. leading
3. lagging
4. zero

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183. When the primary of a transformer is connected to a dc supply

1. a primary draw small current
2. primary leakage reactance is increased
3. core losses are increased
4. primary may burned out

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184. When the secondary of a transformer is short circuited, the primary inductance

1. is decreased
2. remains the same
3. is increased
4. becomes zero

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185. When the speed of a dc motor increases, its armature current

1. increases
2. remains the same
3. decreases
4. becomes infinite

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186. Which DC machines are the most common?

1. 2 pole
2. 6 pole
3. 4 pole
4. 8 pole

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187. Which is a variable speed motor?

1. series
2. commutatively compounded
3. shunt
4. differentially compounded

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188. Which is the most suitable for punch presses?

1. shunt motor
2. differentially compounded motor
3. series motor
4. commutatively compounded motor

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189. Which motor has the best speed regulation?

1. Series
2. Shunt
3. Commutatively compounded
4. Differentially compounded

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190. Which motor is used to start heavy loads?

1. series
2. differentially compounded
3. shunt
4. commulatively compounded

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