Rectifiers and Converters

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 VD. 1700—2000 V

Which of the following is reversible in action ? A. Motor generator set B. Motor converterC. Rotary converter D. Any of the above E. None of the above

A rotary converter is a single machine with______________? A. one armature and one field B. two armatures and one field C. one armature and two fields D. none of the above

A rotary converter in general construction and design, is more or less like___________? A. a transformer B. an induction motor C. an alternatorD. any D.C. machine

Which of the following metals is generally manufactured by electrolysis process ? A. LoadB. Aluminium C. Copper D. Zinc E. None of the above

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 converterD. Mercury arc rectifier…

A rotary converter operates at a______________? A. low power factorB. high power factor C. zero power factor D. none of the above

In a rotary converter armature currents are______________? A. d.c. only B. a.c. onlyC. partly a.c. and partly d.c.

In which of the following appUcations, direct current is absolutely essential ? A. IlluminationB. Electrolysis C. Variable speed operation D. Traction

In a mercury arc rectifier positive ions are attracted towards______________? A. anodeB. cathode C. shell bottom D. mercury pool