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Practice Test: Question Set - 04


1. The metal rectifiers, as compared to mercury arc rectifiers
    (A) Operate on low temperatures
    (B) Can operate on high voltages
    (C) Can operate on heavy loads
    (D) Give poor regulation

2. 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

3. In a glass bulb mercury arc rectifier the maximum current rating is restricted to
    (A) 2000 A
    (B) 1500 A
    (C) 1000 A
    (D) 500 A

4. 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

5. 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

6. A synchronous converter can be started
    (A) By means of a small auxiliary motor
    (B) From AC. side as induction motor
    (C) From D.C. side as D.C. motor
    (D) Any of the above methods

7. In a rotary converter armature currents are
    (A) D.C. only
    (B) A.C. only
    (C) Partly A.C. and partly D.C.
    (D) None of the above

8. To produce cathode spot in a mercury arc rectifier
    (A) Anode is heated
    (B) Tube is evacuated
    (C) An auxiliary electrode is used
    (D) Low mercury vapor pressures are used

9. 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

10. Which of the following is the loss within the mercury arc rectifier chamber?
    (A) Voltage drop in arc
    (B) Voltage drop at the anode
    (C) Voltage drop at the cathode
    (D) All of the above

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