Have an account?
Skip to Content
Build your own quiz
15 questions
Show Answers
See Preview
- 1. Multiple Choice
Which of the following does not change in a transformer...........
Current
Voltage
Frequency
All of the above
- 2. Multiple Choice
In a transformer the energy is converted from primary to secondary..............
Through the cooling coil
Through air
By the flux
None of the above
- 3. Multiple Choice
The path of a magnetic flux in a transformer should have.............
High resistance
High reluctance
Low resistance
Low reluctance
- 4. Multiple Choice
The degree of mechanical vibrations produced by the lamination of a transformer depends on ..............
Tightness of clamping
Grade of laminations
Size of laminations
All of the above
- 5. Multiple Choice
The no load current drawn by transformer is usually what percent of the full load current.........
0.2 to 0.5 percent
2 to 5 percent
12 to 15 percent
20 to 30 percent
- 6. Multiple Choice
Which winding in a transformer has more no:of turns.............
L.V winding
H.V winding
Primary winding
secondory winding
- 7. Multiple Choice
Efficiency of power transformer is of the order of ...........
100%
98%
50%
25%
- 8. Multiple Choice
A common method of cooling a power transformer is ..............
natural air cooling
air blast cooling
oil cooling
any of the above
- 9. Multiple Choice
Transformer breaths in when
Load on it increases
Load on it decreases
Load remains constant
None
- 10. Multiple Choice
The purpose of providing iron core in a a stepup transformer is ..............
To provide coupling between primary and secondary
To increase the magnitude of mutual flux
to decrease the magnitude of magnetizing current
To provide all features
- 11. Multiple Choice
Two transformer operating in parallel will share the load depending up on their........
Leakage reactance
per unit impedance
Efficiency
Ratings
- 12. Multiple Choice
Spacers are provided between adjacent colis
to provide free passage of cooling oil
to insulate coils from each other
Both a) and b)
None of these
- 13. Multiple Choice
The use of higher flux density in the transformer design...........
Reduces weight per KVA
Reduces iron losses
Reduces copper losses
Increases peak Load efficiency
- 14. Multiple Choice
The chemical used in breather is ..............
Asbestos fiber
Silica sand
Sodium chloride
Silica gel
- 15. Multiple Choice
Material used for construction od transformer core is usually
Wood
Copper
aluminium
Silicon steel
- Answer choicesTagsAnswer choicesTags