Which of the following are the applications of D.C. system ?

Related Mcqs:

1. 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...

2. 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...

3. The metal rectifiers are preferred to valve rectifiers due to which of the following advantages ?

   A. They are mechanically strong B. They do not require any voltage for filament heating C. Both (A) and (B) D. None of the above...

4. 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...

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

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

6. In which of the following appUcations, direct current is absolutely essential ?

   A. Illumination B. Electrolysis C. Variable speed operation D. Traction...

7. 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...

8. Which of the following metals is generally manufactured by electrolysis process ?

   A. Load B. Aluminium C. Copper D. Zinc E. None of the above...

9. In which of the following equipment direct current is needed ?

   A. Telephones B. Relays C. Time switches D. All of the above...

10. Which of the following methods may be used to convert A.C. system to D.C ?

    A. Rectifiers B. Motor converters C. Motor-generator sets D. Rotary converters E. All of the above...