Monday, 29 October 2012

Rectifiers and Converters Multiple Choice Questions and Answers Preparation for Competition exams pdf

1.    Which of the following are the applications of D.C. system ?
(a)     Battery charging work
(b)     Arc welding 
(c)    Electrolytic and electro-chemical processes
(d)    Arc lamps for search lights
(e)    All of the above
Ans: e

2.    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)    Rotary converters
(e)    All of the above
Ans: e

3.    In a single phase rotary converter the number of slip rings will be
(a) two   
(b) three
(c) four   
(d) six
(e) none
Ans: a

4.    A synchronous converter can be started
(a)     by means of a small auxiliary motor
(b)     from AC. side as induction motor
(c)    from D.C. side as D.C. motor
(d)    any of the above methods
(e)    none of the above methods
Ans: d

5.    A rotary converter is a single machine with
(a)     one armature and one field
(b)     two armatures and one field
(c)    one armature and two fields
(d)    none of the above
Ans: a

6.    A rotary converter combines the function of
(a)    an induction motor and a D.C. generator
(b)    a synchronous motor and a D.C. generator.
(c)    a D.C. series motor and a D.C. generator
(d)    none of the above
Ans: b

7.    Which of the following is reversible in action ?
(a)    Motor generator set
(b)    Motor converter
(c)    Rotary converter
(d)    Any of the above
(e)    None of the above
Ans: c

8.    Which of the following metals is generally manufactured by electrolysis process ?
(a) Load   
(b) Aluminium
(c) Copper   
(d) Zinc
(e) None of the above
Ans: b

9.    With a motor converter it is possible to obtain D.C. voltage only upto
(a)     200-100 V
(6)     600—800 V
(c)    1000—1200 V
(d)    1700—2000 V
Ans: d

10.    Normally, which of the following is used, when a large-scale conversion from AC. to D.C. power is required ?
(a)     Motor-generator set
(b)     Motor converter
(c)    Rotary converter
(d)    Mercury arc rectifier
Ans: d

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