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Electrical Machine Design

The voltage control in electric supply networks in required on account of which of the following reasons ?

The voltage control in electric supply networks in required on account of which of the following reasons ?

A. Adjustment of voltage at consumers premises within statutory limits
B. Control of active and reactive power
C. Adjustment of short period daily and seasonal voltage variations in accordance with variations of load
D. All of the above

The voltage control in electric supply networks in required on account of which of the following reasons ? Read More »

Electrical Machine Design

A current density of __________ is ilsed for large power transformers with forced circulation of oil or with water cooling coils?

A current density of __________ is ilsed for large power transformers with forced circulation of oil or with water cooling coils?

A. 1.5 to 2.5 A/mm2
B. 3.5 to 4.5 A/mm2
C. 4.0 to 5.0 A/mm2
D. 5.4 to 6.2 A/mm2

A current density of __________ is ilsed for large power transformers with forced circulation of oil or with water cooling coils? Read More »

Electrical Machine Design

For 275 kV transformers, using cold rolled grain oriented steel, which of the following values of flux density may be used?

For 275 kV transformers, using cold rolled grain oriented steel, which of the following values of flux density may be used?

A. 1.0 Wb/m2
B. 1.1 Wb/m2
C. 1.3 Wb/m2
D. 1.6 Wb/m2
E. None of the above

For 275 kV transformers, using cold rolled grain oriented steel, which of the following values of flux density may be used? Read More »

Electrical Machine Design

The usual values of maximum flux densities for distribution transformers using hot rolled silicon steel are______________?

The usual values of maximum flux densities for distribution transformers using hot rolled silicon steel are______________?

A. 0.5 to 0.8 Wb/m2
B. 0.8 to 1.0 Wb/m2
C. 1.1 to 1.35 Wb/m2
D. 1.4 to 1.8 Wb/m2

The usual values of maximum flux densities for distribution transformers using hot rolled silicon steel are______________? Read More »

Electrical Machine Design

For large power transformers, self oil cooled type or air blast type which of the following values of current density may be used?

For large power transformers, self oil cooled type or air blast type which of the following values of current density may be used?

A. 1.0 to 1.2 A/mm2
B. 1.5 to 2.0 A/mm2
C. 2.2 to 3.2 A/mm2
D. 3.2 to 4.2 A/mm2

For large power transformers, self oil cooled type or air blast type which of the following values of current density may be used? Read More »

Electrical Machine Design