11. 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 Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option E No explanation is given for this question Let's Discuss on Board
12. In a phase-shift control method, the phase shift between anode and grid voltages can be achieved by means of A. Shunt motor B. Synchronous motor C. Induction regulator D. Synchronous generator Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C No explanation is given for this question Let's Discuss on Board
13. On which of the following factors the number of phases for which a rectifier should be designed depends? A. The voltage regulation of the rectifier should be low B. In the output circuit there should be no harmonics C. The power factor of the system should be high D. All of the above Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D No explanation is given for this question Let's Discuss on Board
14. With a motor converter it is possible to obtain D.C. voltage only upto A. 100-200 V B. 600-800 V C. 1000-1200 V D. 1700-2000 V Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D No explanation is given for this question Let's Discuss on Board
15. A commutating rectifier consists of commutator driven by A. An induction motor B. A synchronous motor C. A D.C. series motor D. A D.C. shunt motor Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
16. In a mercury pool rectifier, the voltage drop across its electrodes A. is directly proportional to load B. is inversely proportional to load C. varies exponentially with the load current D. is almost independent of load current Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D No explanation is given for this question Let's Discuss on Board
17. When a rectifier is loaded which of the following voltage drops take place ? A. Voltage drop in transformer reactance B. Voltage drop in resistance of transformer and smoothing chokes C. Arc voltage drop D. All of the above Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D No explanation is given for this question Let's Discuss on Board
18. In a mercury arc rectifier, the anode is usually made of A. copper B. aluminium C. silver D. graphite E. tungsten Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D No explanation is given for this question Let's Discuss on Board
19. Which of the following metals is generally manufactured by electrolysis process? A. Load B. Aluminium C. Copper D. Zinc E. None of the above Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
20. If cathode and anode connections in a mercury arc rectifier are inter changed A. The rectifier will not operate B. Internal losses will be reduced C. Both ion and electron streams will move in the same direction D. The rectifier will operate at reduced efficiency Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
