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MCQs 1: Normally, which of the following is used, when a large-scale conversion from AC. to D.C. power is required ?

Motor-generator set Motor converter Rotary converter Mercury arc rectifier
Answer Explanation

MCQs 2: A rotary converter operates at a______________?

low power factor high power factor zero power factor none of the above
Answer Explanation

MCQs 3: In a rotary converter armature currents are______________?

d.c. only a.c. only partly a.c. and partly d.c.
Answer Explanation

MCQs 4: In which of the following appUcations, direct current is absolutely essential ?

Illumination Electrolysis Variable speed operation Traction
Answer Explanation

MCQs 5: In a mercury arc rectifier positive ions are attracted towards______________?

anode cathode shell bottom mercury pool
Answer Explanation

MCQs 6: In which of the following equipment direct current is needed ?

Telephones Relays Time switches All of the above
Answer Explanation

MCQs 7: Which of the following AC. motors is usually used in large motor-generator sets?

Synchronous motor Squirrel cage induction motor Slip ring induction motor Any of the above
Answer Explanation

MCQs 8: In a rotary converter I2R losses as compared to a D.C. generator of the same size will be___________?

same less double three times
Answer Explanation

MCQs 9: The potential drop in the arc, in a mercury arc rectifier, varies_____________?

0.05 V to 0.2 V per cm length of the arc 0.5 V to 1.5 V per cm length of the arc 2 V to 3.5 V per cm length of the arc none of the above
Answer Explanation

MCQs 10: Mercury, in arc rectifiers, is chosen for cathode because________________?

its ionization potential is relatively low its atomic weight is quite high its boiling point and specific heat are low it remains in liquid state at ordi¬nary temperature all of the above
Answer Explanation

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