Ward-Leonard controlled D.C. drives are generally used for _____________________ excavators?

Related Mcqs:

1. ________________is preferred for automatic drives?

   A. Squirrel cage induction motor B. Synchronous motors C. Ward-Leonard controlled D.C. motors D. Any of the above...

2. 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...

3. For derries and winches which of the following drives can be used ?

   A. Pole changing squirrel cage motors B. D.C. motors with Ward-leonard con-trol C. A.C. slip ring motors with variable resistance D. Any of the above...

4. Which of the following drives is suitable for mines where explosive gas exists ?

   A. Steam engine B. Diesel engine C. Battery locomotive D. Any of the above...

5. The speed of a locomotive is controlled by_______________?

   A. flywheel B. gear box C. applying brakes 11. D. regulating steam flow to engine...

6. In a single stage transistor amplifier, RC and RL represent collector resistance and load resistance respectively. The transistor sees a d.c. load of _____________________?

   A. RC + RL B. RC || RL C. RL D. RC...

7. In case of _________________ free running and coasting periods are generally long ?

   A. main-line service B. urban service C. sub-urban service D. all of the above...

8. The zero signal IC is generally ______________ mA in the initial stages of a transistor amplifier?

   A. 4 B. 1 C. 3 D. More than 10...

9. The base resistor method is generally used in ________________?

   A. Amplifier circuits B. Switching circuits C. Rectifier circuits D. None of the above...

10. RC coupling is generally confined to low power applications because of____________?

    A. Large value of coupling capacitor B. Low efficiency C. Large number of components D. None of the above...