Which of the following AC. motors is usually used in large motor-generator sets?

Related Mcqs:

1. In a rotary converter I2R losses as compared to a D.C. generator of the same size will be___________?

   A. same B. less C. double D. three times...

2. Normally, which of the following is used, when a large-scale conversion from AC. to D.C. power is required ?

   A. Motor-generator set B. Motor converter C. Rotary converter D. Mercury arc rectifier...

3. With a motor converter it is possible to obtain D.C. voltage only upto__________?

   A. 200-100 V B. 600—800 V C. 1000—1200 V D. 1700—2000 V...

4. In a mercury arc rectifier, the anode is usually made of_____________?

   A. copper B. aluminium C. silver D. graphite E. tungsten...

5. The applications of selenium rectifiers are usually limited to potential of_____________?

   A. 10 V B. 30 V C. 60 V D. 100 V E. 200 V...

6. Copper oxide rectifier is usually designed not to operate above___________?

   A. 10°C B. 20°C C. 30°C D. 45°C...

7. Glass rectifiers are usually made into units capable of D.C. output (maximum continuous rating) of _____________?

   A. 100 A at 100 V B. 200 A at 200 V C. 300 A at 300 V D. 400 A at 400 V E. 500 A at 500 V...

8. Which of the following rectifiers are primarily used for charging of low voltage batteries from AC supply ?

   A. Mechanical rectifiers B. Copper oxide rectifiers C. Selenium rectifiers D. Electrolytic rectifiers E. Mercury arc rectifiers...

9. Which of the following statement is incorrect ?

   A. Copper oxide rectifier is a linear device B. Copper oxide rectifier is not a perfect rectifier C. Copper oxide rectifier has a low efficiency D. Copper oxide rectifier finds use in control circuits E. Copper oxide rectifier is not stable during early life...

10. Which of the following mercury arc rectifier will deliver least undulating current?

    A. Six-phase B. Three-phase C. Two-phase D. Single-phase...