TRANSFORMER BASIC MCQ - 2
1. Buchholz's relay gives warning and protection against
(a) electrical fault inside the transformer itself
2. The magnetising current of a transformer is usually small because it has
3. Which of the following properties is not necessarily desirable for the material for transformer core ?
4. The leakage flux in a transformer depends upon
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
(a) electrical fault inside the transformer itself
(b) electrical fault outside the transformer in outgoing feeder
(c) for both outside and inside faults
(d) none of the above
2. The magnetising current of a transformer is usually small because it has
(a) small air gap
(b) large leakage flux
(c) laminated silicon steel core
(d) fewer rotating parts
3. Which of the following properties is not necessarily desirable for the material for transformer core ?
(a) Low hysteresis loss
(b) High permeability
(c) High thermal conductivity
(d) Adequate mechanical strength
4. The leakage flux in a transformer depends upon
(a) load current
(b) load current and voltage
(c) load current, voltage and frequency
(d) load current, voltage, frequency and power factor
(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 |
Comments
Post a Comment