In transformers using hot rolled steel, the cross-section of the yoke is made about __________ greater than that of the core?

Related Mcqs:

Which of the following materials is used in the manufacture of resistance grids to be used in the starters of large motors ?

A. Copper B. Aluminium C. Steel D. Cast-iron...

In self cooled motors the cooling time constant is about ___________ than the heating time constant because cooling conditions are worse at standstill?

A. 2 to 3 times greater B. 3 to 4 times greater C. 4 to 5 times greater D. none of the above...

____________are always double layer type?

A. Closed windings B. Open windings C. Either of the above D. None of the above...

Which of the following brushes can be used for high values of current density ?

A. Metal graphite brushes B. Hard carbon brushes C. Electro-graphitic brushes D. Natural graphite brushes...

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...