Page No. 175
Which of the following statement is incorrect ?
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In phase-shift control method the control is carried out by varying the of grid voltage
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The metal rectifiers are preferred to valve rectifiers due to which of the following advantages ?
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Copper oxide rectifier is usually designed not to operate above___________?
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Ageing of a selenium rectifier may change the output voltage by__________?
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The efficiency of the copper oxide rectifier seldom exceeds____________?
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Selenium rectifier can be operated at temperatures as high as____________?
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The applications of selenium rectifiers are usually limited to potential of_____________?
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In selenium rectifiers efficiencies ranging from _______ to _______ percent are attainable?
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A commutating rectifier consists of commutator driven by___________?
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