Recent questions tagged core

1 answer 52 views

A 40 kVA transformer has a core loss of 400 W and a full load copper loss of 800 W. The proportion of full load at maximum efficiency is

asked May 8, 2018 in Electric Power Transmission by Shimroz123
1 answer 20 views

The core construction is like spokes of a wheel in following transformer:  (A) Berry Type Transformer (B) Core Type Transformer (C) Shell Type Transformer (D) None of the above

asked May 8, 2018 in Switchgear And Protection by Shimroz123
1 answer 13 views

Core type transformers are popular in___________.  (A) High voltage applications (B) Low voltage applications (C) All of the above (D) None of the above

asked May 8, 2018 in Electrical Engineering by Shimroz123
1 answer 21 views

The desirable properties of transformer core material are  (1) low permeability and low hysteresis loss. (2) high permeability and high hysteresis loss. (3) high permeability and low hysteresis loss. (4) low permeability and hysteresis loss.

asked May 1, 2018 in Electrical Machine by Shimroz123
1 answer 24 views

A single core lead sheathed cable with two dielectrics of permittivity 4 and 3, respectively, are subjected to same maximum stress. If the conductor diameter is 1.5 cm, the outer diameter of the first dielectric is (A) 1.125 cm (B) 1.5 cm (C ) 2 cm (D) 8 cm

asked Apr 28, 2018 in Power system by Shimroz123
1 answer 446 views

A single core cable is designed to work for a single phase system with a peak voltage of 220 kV. The maximum permissible stress in the dielectric is not to exceed 20 kV/mm. For economical size, the overall core diameter of the cable is (A) 28.2 mm (B) 26.4 mm (C) 24.4 mm (D) 22.0 mm

asked Apr 28, 2018 in Electrical Engineering by Shimroz123
1 answer 18 views

The main purpose of using core in a transformer is to (A) decrease iron losses (B) eliminate magnetic hysteresis (C) reduce reluctance of the common magnetic circuit (D) prevent eddy current loss

asked Apr 28, 2018 in Electrical Engineering by Shimroz123
1 answer 37 views

A ferrite core has less eddy current loss than an iron core because?

asked Mar 25, 2018 in Electrical Engineering by Shimroz123
1 answer 31 views

When secondary of a current transformer is open-circuited its iron core will be?

asked Mar 19, 2018 in Transformer by Shimroz123
1 answer 13 views

The size of a transformer core will depend on?

asked Mar 19, 2018 in Transformer by Shimroz123
1 answer 540 views

Reduction in core losses and increase in permeability are obtained with transformer employing?

asked Mar 19, 2018 in Transformer by Shimroz123
1 answer 20 views

Why does the core of a transformer need to be laminated?

asked Mar 14, 2018 in Electrical Engineering by Quiz
1 answer 28 views

In DC generators lamination core are generally made of?

asked Mar 3, 2018 in Electrical Machine by Quiz
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