Rectifiers and Converters MCQ Test - ObjectiveBooks

Rectifiers and Converters MCQ Test

Practice Test: Question Set - 06

1. Which of the following is reversible in action?
    (A) Motor generator set
    (B) Motor converter
    (C) Rotary converter
    (D) Any of the above

2. 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

3. In which of the following amputations, direct current is absolutely essential?
    (A) Illumination
    (B) Electrolysis
    (C) Variable speed operation
    (D) Traction

4. In which of the following equipment direct current is needed?
    (A) Telephones
    (B) Relays
    (C) Time switches
    (D) All of the above

5. The potential drop in the arc, in a mercury arc rectifier, varies
    (A) 0.05 V to 0.2 V per cm length of the arc
    (B) 0.5 V to 1.5 V per cm length of the arc
    (C) 2 V to 3.5 V per cm length of the arc
    (D) None of the above

6. In a mercury arc rectifier________ flow from anode to cathode
    (A) Ions
    (B) Electrons
    (C) Ions and electrons
    (D) Any of the above

7. A mercury arc rectifier possesses __________ regulation characteristics
    (A) Straight line
    (B) Curved line
    (C) Exponential
    (D) None of the above

8. In a grid control of mercury arc rectifiers when the grid is made positive relative to cathode, then it the electrons on their way __________ to anode.
    (A) Accelerates
    (B) Decelerates
    (C) Any of the above
    (D) None of the above

9. Ageing of a selenium rectifier may change the output voltage by
    (A) 5 to 10 per cent
    (B) 15 to 20 per cent
    (C) 25 to 30 per cent
    (D) None of the above

10. The efficiency of an electrolytic rectifier is nearly
    (A) 80 %
    (B) 70 %
    (C) 60 %
    (D) 40 %

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