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1.  In electric circuits, ‘inductance’ is the property of a circuit which:

2.  Inductors have the effect of storing current as an electromagnetic field whenever the current increases and:

3.  Look at the diagram: The following diagram shows the symbol for a:

4.  An EMF can be induced in a conductor if there is a relative movement between a conductor and:

5.  Faraday’s Law of electromagnetic induction states that the value of the EMF induced in a circuit depends on the number of conductors in the circuit and the rate of change of the:

6.  The following formula can be used to determine the voltage induced in a conductor by a moving magnetic field: In the formula, the ø stands for the:

7.  A coil of 400 turns is cut by a magnetic field of 0.15 Wb in 4 seconds. The voltage induced in the coil will be:

8.  The EMF generated in a conductor can be determined using the following formula: In the formula the θ symbol stands for the:

9.  A 15 cm conductor is rotated within a magnetic field of a constant density of 0.8 Tesla. If the velocity relative to the field is 12 m per second, then the voltage generated at a cutting angle of 45º will be:

10.  The inductive effect of Lenz’s law is such that the induced current will appear in such a direction that it:

11.  Magnetic inductance occurs when a magnet:

12.  In an electric circuit, inductance occurs when a current in one circuit causes:

13.  The value of inductance in an inductor is a function of the size and number of turns in the coil, the magnetic effects of the core and the:

14.  Look at the following photo: The photo shows:

15.  The henry is the inductance of a closed circuit in which an EMF of 1 volt is produced when the electric current flowing in the circuit varies uniformly at the rate of:

16.  The EMF generated in an inductor can be determined using the following formula: In the formula the L symbol stands for the:

17.  If the current through an inductor of 1.2 H is reduced uniformly from 6 A to 1 A in 0.4s, then the value of the induced EMF will be:

18.  The current in a 150 turn coil changes from 4 amps to zero amps causing a flux change of 200 mWb. The inductance of the coil is:

19.  The following formula can be used to determine the inductance of a coil from physical quantities. In the formula the term μ_{o} stands for the:

20.  An air cored coil with 50 turns of wire has been wound over a length of 100 mm on a plastic pipe with an outside diameter of 25 mm. The inductance of coil will be:

21.  The term ‘selfinductance’ is used when a conductor has a voltage induced in it by:

22.  When voltage is applied, to an inductor, a magnetic field builds up and in doing so, produces a generated voltage that:

23.  The inclusion of an iron core within a coil:

24.  With an inductor, the value of any induced voltage depends on the:

26.  When opening highly inductive circuits, it is necessary to use a bypass circuit through which the high self induced voltage may be discharged. This bypass circuit is called a:

27.  Any two coils sharing a part of a magnetic field will experience:

28.  When inductors are placed in series, the total value of the inductance is determined by:

29.  The voltage across the inductor rises almost instantaneously to a maximum when switched on:

30.  An inductor is therefore said to have a time constant τ = tau) which is found from the formula: In the formula the symbol ‘L’ stands for the:

31.  The following diagram shows a time constant curve applied to the rise of current in an inductive circuit: Three timeconstants after switch on, the current will be:

32.  A 0.75 H choke has an internal resistance of 20 Ω. The time constant of the choke is:

33.  The energy that can be stored in the electromagnetic field around an inductor can be calculated from the following formula: In the formula the term ‘I’ stands for:

34.  A 6 H electromagnet with an internal resistance of 40 Ω has a current flowing through it of 5A. The energy stored in its fully charged magnetic field is:

35.  Care must be taken when working with large inductors as the energy in an inductor can be discharged very fast. This will result in the:

36.  Coils often have a magnetic core, such as laminated iron or ferrite added to:

37.  Toroidal cores of ceramic materials are popular in many areas of electronics and electrical engineering mainly because:

38.  Look at the following diagram: The diagram illustrates the principle of operation of a Kettering ignition system. The operation of this system is based on, which is based on:

39.  If the insulation on an inductor breaks down, it can present two common problemsshorted turns and:

40.  Broken conductors can occur in inductors, usually due to:

41.  The insulation resistance of inductors with more than one coil should be tested between coils and an insulation value greater than:

42.  The resistance of inductors can be measured to ensure that the coil has continuity. This test ensures that the:

43.  Before putting into service, relays using induction coils, should be given an insulation resistance test, a continuity test and:

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