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Quiz 9
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Q.1
The insulation between windings and grounded core and the insulation between thewindings of the same phase is called
minor insulation
major insulation
either of the above
none of the above
Q.2
Which of the following is the basic consideration in the design of insulation ?
Electrical considerations
Mechanical considerations
Thermal considerations
All of the above
Q.3
The high voltage winding is usually which of the following type ?
Cylindrical winding with circular conductors
Cross-over winding with either circular or small rectangular conductors
Continuous disc type winding with rectangular conductors
All of the above types
Q.4
A current density of _____ is ilsed for large power transformers with forced circulationof oil or with water cooling coils
1.5 to 2.5 A/mm2
3.5 to 4.5 A/mm2
4.0 to 5.0 A/mm2
5.4 to 6.2 A/mm2
Q.5
For large power transformers, self oil cooled type or air blast type which of thefollowing values of current density may be used ?
1.0 to 1.2 A/mm2
1.5 to 2.0 A/mm2
2.2 to 3.2 A/mm2
3.2 to 4.2 A/mm2
Q.6
ForkV transformers, using cold rolled grain oriented steel, which of the followingvalues of flux density may be used?
1.0 Wb/m2
1.1 Wb/m2
1.3 Wb/m2
1.6 Wb/m2
Q.7
The usual values of maximum flux densities for distribution transformers using hotrolled silicon steel are
0.5 to 0.8 Wb/m2
0.8 to 1.0 Wb/m2
1.1 to 1.35 Wb/m2
1.4 to 1.8 Wb/m2
Q.8
The voltage control in electric supply networks in required on account of which of the following reasons ?
Adjustment of voltage at consumers premises within statutory limits
Control of active and reactive power
Adjustment of short period daily and seasonal voltage variations in accordance with variations of load
All of the above
Q.9
Are always double layer type.
Closed windings
Open windings
Either of the above
None of the above
Q.10
The distance between the starts of two consecutive coils measured in terms of coilsides is called
front pitch
winding pitch
commutator pitch
back pitch
Q.11
The winding where dummy coils are used is sometimes called
duplex winding
triplex winding
forced winding
none of the above
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