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MCQs 1: In a phase-shift control method, the phase shift between anode and grid voltages can be achieved by means of______________?

shunt motor synchronous motor induction regulator synchronous generator
Answer Explanation

MCQs 2: In mercury arc rectifiers having grid, the arc can be struck between anode and cathode only when the grid attains a certain potential, this potential being known as______________?

maximum grid voltage critical grid voltage any of the above none of the above
Answer Explanation

MCQs 3: Which of the following statement is incorrect ?

Copper oxide rectifier is a linear device Copper oxide rectifier is not a perfect rectifier Copper oxide rectifier has a low efficiency Copper oxide rectifier finds use in control circuits Copper oxide rectifier is not stable during early life
Answer Explanation

MCQs 4: In phase-shift control method the control is carried out by varying the of grid voltage

magnitude polarity phase any of the above none of the above
Answer Explanation

MCQs 5: The metal rectifiers are preferred to valve rectifiers due to which of the following advantages ?

They are mechanically strong They do not require any voltage for filament heating Both (A) and (B) None of the above
Answer Explanation

MCQs 6: Copper oxide rectifier is usually designed not to operate above___________?

10°C 20°C 30°C 45°C
Answer Explanation

MCQs 7: Ageing of a selenium rectifier may change the output voltage by__________?

5 to 10 per cent 15 to 20 per cent 25 to 30 per cent none of the above
Answer Explanation

MCQs 8: The efficiency of the copper oxide rectifier seldom exceeds____________?

90 to 95% 85 to 90% 80 to 85% 65 to 75%
Answer Explanation

MCQs 9: Selenium rectifier can be operated at temperatures as high as____________?

25°C 40°C 60°C 75°C
Answer Explanation

MCQs 10: The applications of selenium rectifiers are usually limited to potential of_____________?

10 V 30 V 60 V 100 V 200 V
Answer Explanation

MCQs 11: In selenium rectifiers efficiencies ranging from _______ to _______ percent are attainable?

25, 35 40, 50 60, 70 75, 85
Answer Explanation

MCQs 12: A commutating rectifier consists of commutator driven by___________?

an induction motor a synchronous motor a D.C. series motor a D.C. shunt motor
Answer Explanation

MCQs 13: In a mercury arc rectifier, the anode is usually made of_____________?

copper aluminium silver graphite tungsten
Answer Explanation

MCQs 14: Which of the following rectifiers have been used extensively in supplying direct current for electroplating ?

Copper oxide rectifiers Selenium rectifiers Mercury arc rectifiers Mechanical rectifiers None of the above
Answer Explanation

MCQs 15: Which of the following is the loss within the mercury arc rectifier chamber ?

Voltage drop in arc Voltage drop at the anode Voltage drop at the cathode All of the above
Answer Explanation

MCQs 16: Which of the following rectifiers are primarily used for charging of low voltage batteries from AC supply ?

Mechanical rectifiers Copper oxide rectifiers Selenium rectifiers Electrolytic rectifiers Mercury arc rectifiers
Answer Explanation

MCQs 17: The efficiency of an electrolytic rectifier is nearly____________?

80% 70% 60% 40%
Answer Explanation

MCQs 18: The ignited or auxiliary anode in mercury arc rectifier is made of____________?

graphite boron carbide aluminium copper
Answer Explanation

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