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

Related Mcqs:

1. For crane travel which of the following motors is normally used ?

   A. Synchronous motor B. D.C. differentially compound motor C. Ward-Leonard controlled D.C. shunt motor D. AC. slip ring motor...

2. 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...

3. 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...

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

   A. High efficiency operation B. Reversibility C. Variable speed drive D. High starting torque...

5. 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...

6. 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...

7. 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...

8. 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...

9. The characteristics of drive for crane hoisting and lowering are which of the following ?

   A. Precise control B. Smooth movement C. Fast speed control D. All of the above...

10. The capacity of a crane is expressed in terms of_______________?

    A. type of drive B. span C. tonnes D. any of the above...