A. 50 ohms
B. 500 ohms
C. 1000 ohms
D. 5000 ohms
Related Mcqs:
- 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 - A coil of wire is arranged with its plane perpendicular to a uniform magnetic field o flux density B. when the radius of the coil increases from r1 to r2 in time Δt then what is the emf induced in the coil ?
A. ωB/r22-r12/Δt
B. ωB(r2-r1)2/Δt
C. ωB(r22-r12)/Δt
D. ωB(r22+r12)/Δt - 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 - The property of coil by which a counter e.m.f. is induced in it when the current through the coil changes is known as__________?
A. self-inductance
B. mutual inductance
C. series aiding inductance
D. capacitance - 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 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 - 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 - For a purely inductive circuit which of the following is true ?
A. Apparent power is zero
B. Relative power is.zero
C. Actual power of the circuit is zero
D. Any capacitance even if present in the circuit will not be charged - Non inductive resistances are used in decreasing______________?
A. Mutual inductance
B. Self inductance
C. Magnetic fields
D. Heating effect