Rectifiers and Converters Online MCQ Quiz Test - Set 01 - ObjectiveBooks

Rectifiers and Converters Online MCQ Quiz Test - Set 01

Practice Test: Question Set - 01

1. If cathode and anode connections in a mercury arc rectifier are inter changed
    (A) The rectifier will not operate
    (B) Internal losses will be reduced
    (C) Both ion and electron streams will move in the same direction
    (D) The rectifier will operate at reduced efficiency

2. Mercury, in arc rectifiers, is chosen for cathode because
    (A) Its ionization potential is relatively low
    (B) Its atomic weight is quite high
    (C) Its boiling point and specific heat are low
    (D) All of the above

3. In a three-phase mercury arc rectifiers each anode conducts for
    (A) One-third of a cycle
    (B) One-fourth of a cycle
    (C) One-half a cycle
    (D) Two-third of a cycle

4. On which of the following factors the number of phases for which a rectifier should be designed depends?
    (A) The voltage regulation of the rectifier should be low
    (B) In the output circuit there should be no harmonics
    (C) The power factor of the system should be high
    (D) All of the above

5. In a phase-shift control method, the phase shift between anode and grid voltages can be achieved by means of
    (A) Shunt motor
    (B) Synchronous motor
    (C) Induction regulator
    (D) Synchronous generator

6. Selenium rectifier can be operated at temperatures as high as
    (A) 25°C
    (B) 40°C
    (C) 60°C
    (D) 75°C

7. A commutating rectifier consists of commutator driven by
    (A) An induction motor
    (B) A synchronous motor
    (C) A D.C. series motor
    (D) A D.C. shunt motor

8. The ignited or auxiliary anode in mercury arc rectifier is made of
    (A) Graphite
    (B) Boron carbide
    (C) Aluminium
    (D) Copper

9. The efficiency of the copper oxide rectifier seldom exceeds
    (A) 90 to 95%
    (B) 85 to 90%
    (C) 80 to 85%
    (D) 65 to 75%

10. Which of the following rectifiers are primarily used for charging of low voltage batteries from AC. supply?
    (A) Mechanical rectifiers
    (B) Copper oxide rectifiers
    (C) Selenium rectifiers
    (D) Electrolytic rectifiers

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