Tricky Rectifiers and Converters Multiple choice Questions and Answers pdf

51.   The ignited or auxiliary anode in mercury arc rectifier is made of
(a) graphite 
(b) boron carbide
(c) aluminum
(d) copper
Ans: b

52.    The applications of selenium rectifiers are usually limited to potential of
(a) 10 V 
(b) 30 V
(c) 60 V 
(d) 100 V
(e) 200 V
Ans: d

53.    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
(e) None of the above
Ans: b

54.    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
Ans: b

55.    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
(e)    Mercury arc rectifiers
Ans: d

56.    The efficiency of an electrolytic rectifier is nearly
(a) 80% 
(b) 70%
(c) 60% 
(d) 40%
Ans: c

57.    Which of the following is the loss within the mercury arc rectifier chamber ?
(a)     Voltage drop in arc
(6)     Voltage drop at the anode
(c)    Voltage drop at the cathode
(d)    All of the above
Ans: d

58.    The metal rectifiers, as compared to mercury arc rectifiers
(a)     operate on low temperatures
(b)     can operate on high voltages
(c)    can operate on heavy loads
(d)    give poor regulation
(e)    none of the above
Ans: a

59. In a mercury arc rectifier, the anode is usually made of
(a) copper 
(b) aluminium
(c) silver 
(d) graphite
(e) tungsten
Ans: d

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