Related Questions

The size of air cored transducers in comparison to the iron core parts is
A Smaller
B Larger
C Same
D Unpredictable
A certain amount of current flows through a ring shaped coil with fixed number of turns. How does the magnetic induction B varies inside the coil if an iron core is threaded into coil without dimensional change of coil?
A Decreases
B Increases
C Remains same
D First increases and then decreases depending on the depth of iron in¬sertion
The inductance of an iron-core coil decreases if
A The number of turns is decreased
B The iron core is removed
C The length of the coil decreases
D None of the above
When number of turns in a coil is trippled, without any change in the length of coil, its self inductance becomes?
A Nine times
B Three times
C Six times
D One–third
একটি স্টেপ আপ ট্রান্সফরমারে, গৌণ কুণ্ডলীর পাকসংখ্যা মুখ্য কুন্ডলীর পাকসংখ্যার দ্বিগুণ। যদি মূখ্য কুন্ডলীকে কোন পরিবর্তী বিদ্যুৎ লাইনের সাথে সংযুক্ত করা হয়, তাহলে মুখ্য কুণ্ডলীর তুলনায় গৌণ কুণ্ডলীতে- (In a step up transformer, the number of turns in the secondary coil is twice to that of primary coil. If you apply an alternating current in the primary coil, then in the secondary coil compared to the primary coil-)
A তড়িৎ প্রবাহের মান দ্বিগুণ হবে (current will be doubled)
B তড়িৎ প্রবাহের মান অর্ধেক হবে (current will be halved)
C তড়িৎ বিভবের মান অর্ধেক হবে (voltage will be halved)
D তড়িৎ প্রবাহের মান সমান থাকবে (Current will remain the same)
The effective resistance of an iron-cored choke working on ordinary supply frequency is more than its true resistance because of
A Iron loss in core
B Skin effect
C Increase in temperature
D Capacitive effect between adjacent coil turns
Both the number of turns and the core length of an inductive coil are doubled. Its self-inductance will be
A Unaffected
B Doubled
C Halved
D Quadrupled
A coil is wound on iron core which carries current I. The self-induced voltage in the coil is not affected by
A Variation in coil current
B Variation in voltage to the coil
C Change of number of turns of coil
D The resistance of magnetic path
If 1/2 of the air in a tank is removed with each stroke of a vacuum pump, what fraction of the original amount of air has been removed after four strokes ?
A 15/16
B 7/8
C 1/4
D 1/8
If 1/2 of the air in a tank is removed with each stroke of a vacuum pump,what fraction of the original amount of air has been removed after 4 strokes?
A 15/16
B 7/8
C 1/4
D 1/8

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