921. 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
922. Which of the following is not a unit of inductance ?
A. Henry
B. Coulomb/volt ampere
C. Volt second per ampere
D. All of the above
923. The magnitude of the induced e.m.f. in a conductor depends on the______________?
A. flux density of the magnetic field
B. amount of flux cut
C. amount of flux linkages
D. rate of change of flux-linkages
924. A laminated iron core has reduced eddy-current losses because____________?
A. more wire can be used with less D.C. resistance in coil
B. the laminations are insulated from each other
C. the magnetic flux is concentrated in the air gap of the core
D. the laminations are stacked vertfcally
925. Which of the following circuit elements will oppose the change in circuit current ?
A. Capacitance
B. Inductance
C. Resistance
D. All of the above
926. Which of the following is unit of inductance ?
A. Ohm
B. Henry
C. Ampere turns
D. Webers/metre
927. 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
928. 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
929. An e.m.f. of 16 volts is induced in a coil of inductance 4H. The rate of change of current must be______________?
A. 64 A/s
B. 32 A/s
C. 16 A/s
D. 4 A/s
930. 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
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