In a pure inductive circuit if the supply frequency is reduced to $$\frac{1}{2},\,$$ the current will
A. Be reduced by half
B. Be doubled
C. Be four times as high
D. Be reduced to one fourth
Answer: Option B
This Question Belongs to Electrical Engineering >> A.C Fundamentals, Circuits And Circuit Theory
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Which of the following refers to a parallel circuit?
A. The current through each element is same
B. The voltage across element is in proportion to it's resistance value
C. The equivalent resistance is greater than any one of the resistors
D. The current through any one element is less than the source current
A. Apparent power is more than actual power
B. Reactive power is more than apparent power
C. Actual power is more than reactive power
D. Reactive power is more than actual power
The transient currents are associated with the
A. Changes in the stored energy in the inductors and capacitors
B. Impedance of the circuit
C. Applied voltage to the circuit
D. Resistance of the circuit
The inductance of a coil can be increased by
A. Increasing core length
B. Decreasing the number of turns
C. Decreasing the diameter of the former
D. Choosing core material having high relative permeability
With reference to Mr. Sunil Kumar
By Ohms Law we have
I = V/R
but here R is replaced by impedance Z
Thus, I = V/Z
and,
Z = sqrt(R^2 + XL^2)
As it is a purely inductive circuit thus, R = 0
We have Z = XL = 2πfL
now if f is halved, then XL will also be halved
But I will be doubled
I=V/X
X=2πfL
Put frequency value and compare
Plz solution of this question