Power Generator

191. Which motor never use belt connected loads?

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

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192. Which of the following is a dry storage cell?

1. Leclanche cell
2. Edison cell
3. Mercury cell
4. Nickel cadmium cell

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193. Which of the following is not a primary cell?

1. Carbon-zinc
2. Zinc-chloride
3. Edison call
4. Mercuric oxide

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194. Which of the following is not a secondary cell?

1. Silver-zinc
2. Nickel-iron
3. Silver-oxide
4. Lead-acid

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195. Which of the following is the main function of a battery?

1. To provide a source of steady DC voltage to fixed polarity
2. To provide a source of steady dc voltage of variable polarity
3. To provide a source of variable dc voltage of fixed polarity
4. To provide a source of variable dc voltage of variable polarity

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196. Which of the following is the main function of a dc motor?

1. to generate power
2. to change mechanical energy to electrical energy
3. to change electrical energy to mechanical energy
4. to change chemical energy to mechanical energy

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197. Which of the most suitable motor fro elevator

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

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198. Why are carbon brushes preferable compared to copper brushes

1. they have longer life
2. they have lower resistance
3. they are cheaper
4. they reduce sparking

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199. Why are the field poles and the armature of a dc machine laminated?

1. to reduce the weight of the machine
2. to reduce eddy current
3. to decrease the speed
4. to reduce armature reaction

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200. With respect to the direction of rotation, interpoles on a dc motor must have the same polarity as the main poles

1. ahead of them
2. in parallel with them
3. behind them
4. beside them

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