A. 6 H
B. 8 H
C. 12 H
D. 24 H
Related Mcqs:
- Two coils have inductances of 8 mH and 18 mH and a co-efficient of coupling of 0.5. If the two coils are connected in series aiding, the total inductance will be______________?
A. 32 mH
B. 38 mH
C. 40 mH
D. 48 mH - The self inductances of two coils are 8 mH and 18 mH. If the co-efficients of coupling is 0.5, the mutual inductance of the coils is______________?
A. 4 mH
B. 5 mH
C. 6 mH
D. 12 mH - Two 300 uH coils in series without mutual coupling have a total inductance of___________?
A. 300 uH
B. 600 uH
C. 150 uH
D. 75 uH - The core of a coil has a length of 200 mm. The inductance of coil is 6 mH. If the core length is doubled, all other quantities, remaining the same, the inductance will be_____________?
A. 3 mH
B. 12 mH
C. 24mH
D. 48mH - 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 - Mutually inductance between two magnetically-coupled coils depends on____________?
A. permeability of the core
B. the number of their turns
C. cross-sectional area of their common core
D. all of the above - A 200 turn coil has an inductance of 12 mH. If the number of turns is increased to 400 turns, all other quantities (area, length etc.) remaining the same, the inductance will be___________?
A. 6 mH
B. 14 mH
C. 24 mH
D. 48 mH - The self-inductance of the coil may be defined as equal to the e.m.f. induced in volts when the current in the circuit changes at the rate of unit Weber turns
A. Yes
B. No - Self inductance of a coil depends upon________________?
A. current flowing
B. number of turns per unit length
C. voltage produce
D. all - Self-inductance of a long solenoid is______________?
A. μoN2A
B. μoN2/A
C. μoN2
D. BA
