Question: In case of an inductance, current is proportional to___________?

• 1. voltage across the inductance
• 2. magnetic field
• 3. both A and B
• 4. neither (A) nor (B)

Question: For a purely inductive circuit which of the following is true ?

• 1. Apparent power is zero
• 2. Relative power is.zero
• 3. Actual power of the circuit is zero
• 4. Any capacitance even if present in the circuit will not be charged

Question: An e.m.f. of 16 volts is induced in a coil of inductance 4H. The rate of change of current must be______________?

• 1. 64 A/s
• 2. 32 A/s
• 3. 16 A/s
• 4. 4 A/s

Question: 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______________?

• 1. 32 mH
• 2. 38 mH
• 3. 40 mH
• 4. 48 mH

Question: 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_____________?

• 1. 3 mH
• 2. 12 mH
• 3. 24mH
• 4. 48mH

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