Rectifiers Electrical Engineering Questions - Set 05 - ObjectiveBooks

Rectifiers Electrical Engineering Questions - Set 05

Practice Test: Question Set - 05

1. The advantage of mercury arc rectifier is that
    (A) It is light in weight and occupies small floor space
    (B) It has high efficiency
    (C) It has high overload capacity
    (D) All of the above

2. Which of the following metals is generally manufactured by electrolysis process?
    (A) Load
    (B) Aluminium
    (C) Copper
    (D) Zinc

3. A rotary converter combines the function of
    (A) An induction motor and a D.C. generator
    (B) A synchronous motor and a D.C. generator
    (C) A D.C. series motor and a D.C. generator
    (D) None of the above

4. Which of the following A.C. motors is usually used in large motor-generator sets?
    (A) Synchronous motor
    (B) Squirrel cage induction motor
    (C) Slip ring induction motor
    (D) Any of the above

5. The internal efficiency of a mercury arc rectifier depends on
    (A) Voltage only
    (B) Current only
    (C) Voltage and current
    (D) None of the above

6. In selenium rectifiers efficiencies ranging from ________ to ________ percent are attainable
    (A) 25, 35
    (B) 40, 50
    (C) 60, 70
    (D) 75, 85

7. In a single phase rotary converter the number of slip rings will be
    (A) Two
    (B) Three
    (C) Four
    (D) Six

8. In a mercury arc rectifier positive ions are attracted towards Cathode
    (A) True
    (B) False

9. The voltage drop at anode, in a mercury arc rectifier is due to
    (A) Self restoring property of mercury
    (B) High ionization potential
    (C) Energy spent in overcoming the electrostatic field
    (D) High temperature inside the rectifier

10. Copper oxide rectifier is usually designed not to operate above
    (A) 10°C
    (B) 20°C
    (C) 30°C
    (D) 45°C

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