For which of the following applications D.C. motors are still preferred ?

Related Mcqs:

1. In which of the following applications variable speed operation is preferred ?

   A. Exhaust fan B. Ceiling fan C. Refrigerator D. Water pump...

2. Which of the following motors is preferred for traction work ?

   A. Universal motor B. D.C. series motor C. Synchronous motor D. Three-phase induction motor...

3. Which of the following motors is usually preferred for kiln drives ?

   A. Cascade controlled A.C. motor B. Slip ring induction motor C. Three phase shunt wound com-mutator motor D. Any of the above...

4. For a motor-generator set which of the following motors will be preferred ?

   A. Synchronous motor B. Slip ring induction motor C. Pole changing induction motor D. Squirrel cage induction motor...

5. Which of the following motors is preferred when quick speed reversal is the main consideration ?

   A. Squirrel cage induction motor B. Wound rotor induction motor E. Synchronous motor D. D.C. motor...

6. Which of the following motors is preferred for boom hoist of a travelling crane ?

   A. Single phase motor B. Synchronous motor C. A.C. slip ring motor D. Ward-Leonard controlled D.C. shunt motor...

7. Which of the following motors is preferred when smooth and precise speed control over a wide range is desired ?

   A. D.C. motor B. Squirrel cage induction motor C. Wound rotor induction motor D. Synchronous motor...

8. In which of the following applications the load on motor changes in cyclic order ?

   A. Electric shovels B. Cranes C. Rolling mills D. All of the above...

9. For which of the following applications motor has to start with high acceleration ?

   A. Oil expeller B. Floor mill C. Lifts and hoists D. Centrifugal pump...

10. Which of the following motors are pre-ferred for overhead travelling cranes ?

    A. Slow speed motors B. Continuous duty motors C. Short time rated motors D. None of the above...