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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