Electromagnetic Induction Quiz Part 1

Electromagnetic Induction Quiz Part 1

Q1. Air-core coils are practically free from

A.  hysteresis losses
B.  eddy current losses
C.  both (a) and (b)
D.  none of the above

Ans: C

Q2. 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

Ans: C

Electromagnetic Induction Quiz Part 1

Q3. Find the force acting on a conductor 3m long carrying a current of 50 amperes at right angles to a magnetic field having a flux density of 0.67 tesla.

A.  100 N
B.  400 N
C.  600 N
D.  1000 N

Ans: A

Q4. Current changing from 8 A to 12 A in one second induced 20 volts in a coil. The value of inductance is

A.  5 mH
B.  10 mH
C.  5 H
D.  10 H

Ans: C

Electromagnetic Induction Quiz Part 1

Q5. Which of the following circuit element stores energy in the electromagnetic field?

A.  Inductance
B.  Condenser
C.  Variable resistor
D.  Resistance

Ans: A

Q6. 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

Ans: D

Electromagnetic Induction Quiz Part 1

Q7. Which of the following is unit of inductance?

A.  Ohm
B.  Henry
C.  Ampere turns
D.  Webers/metre

Ans: C

Q8. A coil with negligible resistance has 50 V across it with 10 mA. The inductive reactance is

A.  50 ohms
B.  500 ohms
C.  1000 ohms
D.  5000 ohms

Ans: D

Electromagnetic Induction Quiz Part 1

Q9. Which circuit element(s) will oppose the change in circuit current?

A.  Resistance only
B.  Inductance only
C.  Capacitance only
D.  Inductance and capacitance

Ans: C

Q10. The inductance of a coil will increase under all the following conditions except

A.  when more length for the same number of turns is provided
B.  when the number of turns of the coil increase
C.  when more area for each turn is provided
D.  when permeability of the core increases

Ans: A

Electromagnetic Induction Quiz Part 1