Related Questions

Stepup Transformer ব্যবহৃত হয়-i. Voltage হ্রাসের জন্য ii. তড়িতের অপচয় রোধের জন্য iii. তড়িৎ প্রবাহ হ্রাসের জন্য নিচের কোনটি সঠিক?
A i ও ii
B i ও iii
C ii ও iii
D i, ii ও iii
What is the purpose of providing an iron core in a transformer?
A Provide support to windings
B Reduce hysteresis loss
C Decrease the reluctance of the magnetic path
D Reduce eddy current losses
The purpose of providing an iron core in a transformer is to
A provide support to windings
B reduce hysteresis loss
C decrease the reluctance of the magnetic path
D reduce eddy current losses
A ferrite core has less eddy current loss than an iron core because
A Ferrites have high resistance
B Ferrites are magnetic
C Ferrites have low permeability
D Ferrites have high hysteresis
When secondary of a current transformer is open-circuited its iron core will be
A hot because of heavy iron losses taking place in it due to high flux density
B hot because primary will carry heavy current
C cool as there is no secondary current
D none of above will happen
In an iron cored coil the iron core is removed so that the coil becomes an air cored coil. The inductance of the coil will
A Increase
B Decrease
C Remain the same
D Initially increase and then decrease
The applied voltage of a certain transformer is increased by 50%, while the frequency is reduced by 50%. The maximum core flux density will
A become three times
B become 1.5 times
C become half
D remian the same
The size of a transformer core will depend on
A frequency
B area of the core
C flux density of the core material
D (A) and (B) both
The core used in high frequency transformer is usually
A copper core
B cost iron core
C air core
D mild steel core
A transformer core is laminated to
A reduce hysteresis loss
B reduce eddy current losses
C reduce copper losses
D reduce all above losses

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