Question: Which of the following is unit of inductance ?

• 1. Ohm
• 2. Henry
• 3. Ampere turns
• 4. Webers/metre

Question: Which of the following circuit elements will oppose the change in circuit current ?

• 1. Capacitance
• 2. Inductance
• 3. Resistance
• 4. All of the above

Question: A laminated iron core has reduced eddy-current losses because____________?

• 1. more wire can be used with less DC resistance in coil
• 2. the laminations are insulated from each other
• 3. the magnetic flux is concentrated in the air gap of the core
• 4. the laminations are stacked vertfcally

Question: The magnitude of the induced e.m.f. in a conductor depends on the______________?

• 1. flux density of the magnetic field
• 2. amount of flux cut
• 3. amount of flux linkages
• 4. rate of change of flux-linkages

Question: Which of the following is not a unit of inductance ?

• 1. Henry
• 2. Coulomb/volt ampere
• 3. Volt second per ampere
• 4. All of the above

Question: Mutually inductance between two magnetically-coupled coils depends on____________?

• 1. permeability of the core
• 2. the number of their turns
• 3. cross-sectional area of their common core
• 4. all of the above

Question: The law that the induced e.m.f. and current always oppose the cause producing them is due to____________?

• 1. Faraday
• 2. Lenz
• 3. Newton
• 4. Coulomb

Question: If current in a conductor increases then according to Lenz’s law self-induced voltage will____________?

• 1. aid the increasing current
• 2. tend to decrease the amount of cur-rent
• 3. produce current opposite to the in-creasing current
• 4. aid the applied voltage

Question: Air-core coils are practically free from______________?

• 1. hysteresis losses
• 2. eddy current losses
• 3. both (A) and (B)
• 4. none of the above

Question: 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__________?

• 1. self-inductance
• 2. mutual inductance
• 3. series aiding inductance
• 4. capacitance