Basic Electrical Converters Questions - Set 03 - ObjectiveBooks

Basic Electrical Converters Questions - Set 03

Practice Test: Question Set - 03

1. In a mercury pool rectifier, the voltage drop across its electrodes
    (A) Is directly proportional to load
    (B) Is inversely proportional to load
    (C) Varies exponentially with the load current
    (D) Is almost independent of load current

2. In phase-shift control method the control is carried out by varying the of grid voltage.
    (A) Magnitude
    (B) Polarity
    (C) Phase
    (D) Any of the above

3. Which of the following rectifiers have been used extensively in supplying direct current for electroplating?
    (A) Copper oxide rectifiers
    (B) Selenium rectifiers
    (C) Mercury arc rectifiers
    (D) Mechanical rectifiers

4. In a mercury arc rectifier, the anode is usually made of
    (A) Copper
    (B) Aluminium
    (C) Silver
    (D) Graphite

5. Which of the following methods may be used to convert A.C. system to D.C.?
    (A) Rectifiers
    (B) Motor converters
    (C) Motor-generator sets
    (D) All of the above

6. A rotary converter in general construction and design, is more or less like
    (A) A transformer
    (B) An induction motor
    (C) An alternator
    (D) Any D.C. machine

7. Glass rectifiers are usually made into units capable of D.C. output (maximum continuous rating) of
    (A) 100 A at 100 V
    (B) 200 A at 200 V
    (C) 300 A at 300 V
    (D) 500 A at 500 V

8. In a mercury arc rectifier characteristic blue luminosity is due to
    (A) Color of mercury
    (B) Ionization
    (C) High temperature
    (D) Electron streams

9. It is the _________of the transformer on which the magnitude of angle of overlap depends.
    (A) Resistance
    (B) Capacitance
    (C) Leakage reactance
    (D) Any of the above

10. The applications of selenium rectifiers are usually limited to potential of
    (A) 10 V
    (B) 30 V
    (C) 60 V
    (D) 100 V

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