A. self-inductance of two coils only
B. mutual inductance between two coils only
C. mutual inductance and self inductance of two coils
D. none of the above
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 - 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 - Air-core coils are practically free from______________?
A. hysteresis losses
B. eddy current losses
C. both (A) and (B)
D. none of the above - Two coils have self-inductances of 10 H and 2 H, the mutual inductance being zero. If the two coils are connected in series, the total inductance will be_____________?
A. 6 H
B. 8 H
C. 12 H
D. 24 H - 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 - In case all the flux from the current in coil 1 links with coil 2, the co-efficient of coupling will be____________?
A. 2.0
B. 1.0
C. 0.5
D. zero - 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 - 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 - A small coil lies inside a large coil. The two coils are horizontal concentric and carry currents in opposite directions. The large coil will experience______________?
A. A torque about horizontal axis
B. A torque about vertical axis
C. An upward force along the axis
D. No resultant force
