ELECTRICAL ENGINEERING QUESTION ANSWERS- 15/10/2016

1. The forced oil and air circulation method is usual one for transformers of capacities
(a) upto 5 MVA
(b) upto 10 MVA
(c) upto 20 MVA
(d) 30 MVA upwards
Answer: (d) 30 MVA upwards

2. Yokes with rectangular cross-section are used for
(a) small capacity transformers
(b) medium capacity transformers
(c) large capacity transformers
(d) any of the above
Answer: (a) small capacity transformers

3. The ratio of maximum displacement deviation to full scale deviation of the instrument is
called
(a) static sensitivity
(b) dynamic deviation
(c) linearity

(d) precision or accuracy
Answer: (c) linearity

4. An induction wattmeter can be used for
(a) both D.C. and A.C.
(6) A.C. only
(c) D.C. only
(d) any of the above
Answer: (c) D.C. only

5. With feedback _____ increases.
(a) system stability
(b) sensitivity
(c) gain
(d) effects of disturbing signals
Answer: (a) system stability

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