Important Industrial Drive Multiple Choice Questions and Answers

6.  The range of ratings of electric motor used for rolling mills is of the order of

   A. 10 to 25 kW

   B. 25 to 85 kW

   C. 85 to 400 kW

   D. 400 to 1000 kW

7.  When an electric train is moving down a hill the DC motor operates as a DC

   A. Series motor

   B. Series generator

   C. Shunt motor

   D. Shunt generator

8.  Speed controlled by variation of field flux results in

   A. Constant power Drive

   B. Variable power Drive

   C. Constant torture Drive

   D. Variable torque Drive

9.  The slip power recovery scheme is used in induction motor for speed control in the range

   A. Above synchronous speed

   B. Below synchronous speed

   C. Both above and below synchronous speed

   D. None of the above

10.  The pair used for frequency converter is

   A. Squirrel cage induction motor and synchronous motor

   B. Sleep ring induction motor and a synchronous motor

   C. Sleep ring induction motor and squirrel cage induction motor

   D. All of the above

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