TRANSFORMER BASIC MCQ - 1

1.  A Transformer transformes

      (a) power
     (b) frequency
     (c) only current
     (d) only voltage

2. transformer oil used for
 
     (a) lubrication, cooling
     (b) lubrication only
     (c) none of the above
     (d) insulation and cooling

3. which of the following does not change in transformer?
    (a) voltage
    (b) current
    (c) frequency
    (d) all of the above

4. Which of the following is not a part of transformer  installation?     (a) conservator     (b) exiter      (c) breather     (d) buchholz relay 5. which winding in a transformer has more number of turns?   (a) high voltage winding   (b) low voltage winding   (c) secondary winding   (d) principle winding 6.  Transformer cores are built up from laminations rather than from solid metal so that  (a) eddy current loss is reduced   (b) oil penetrates the core more easily   (c) turn ratio will higher   (d) space management 7.  The ordinary efficiency of a given transformer is maximum when   (a) its run overload   (b)its run at full load   (c)at half load   (d) its Cu loss is equals  to iron loss 8. In a transformer the resistance between its primary and secondary should be    (a) infinity    (b)500ohms    (c)approx 1k ohms    (d) variable 9.  Transformer works on the principle of    (a) faraday’s low of electromagnetic induction    (b)self induction    (c)self and mutual induction path    (d) mutual induction 10. Transformer oil must be free from   (a) gases   (b) odour   (c) moisture   (d)sulpher