1.  With regards to measuring current and voltage in an AC circuit, modern AC instruments are calibrated to read:

2.  The current waveform for a purely resistive circuit:

4.  The power consumed by a purely resistive AC circuit can be determined using the following formula: P = V_{rms} x I_{rms} In the formula, the symbol ‘P’ stands for the:

5.  Figure shows a noninductive resistor: The noninductive effect is produced by winding:

6.  A pure resistance of 15 ohms has been connected across an AC power supply that generates a pure sinewave of 84.84 volts peak voltage. The average power consumed by this resistor will be approximately:

7.  In an inductive AC circuit, the current is continually changing in value and direction, generating an induced EMF that will continually:

8.  Figure 3 shows the waveforms of the voltage and current in a purely inductive AC circuit: Using the voltage phasor as the reference, the current phasor:

9.  On AC, the change in current flow gives rise to an induced EMF that opposes the current flow. The effect of this current opposition is called:

10.  The inductive reactance in an AC circuit can be calculated from the formula: X_{L} = 2 π f L In the formula, the symbol ‘L’ stands for the:

11.  A coil has an inductance of 0.04 H. The inductive reactance of the coil at a frequency of 50 Hz will be:

12.  A 230 V 50 Hz supply has been applied to a coil with an inductance of 0.15 H. The current in the circuit will be approximately:

13.  When inductors are connected in series in an AC circuit, the total inductance can be found using the formula, L_{total} =

14.  Two inductors, one with an inductive reactance of 15 Ω, and the second with an inductive reactance of 10 Ω have been connected in series across a 230 V 50 Hz supply. The total inductive reactance will be:

15.  Two inductors, one with an inductive reactance of 12 Ω, and the second with an inductive reactance of 8 Ω have been connected in parallel across a 230 V 50 Hz supply. The total inductive reactance will be:

16.  Figure shows the voltage, current and power waveshapes for purely inductive circuit: The power waveshape shows that power is:

17.  A pure inductor with an inductive reactance of 150 W has been connected to a 230 V AC circuit. The average power consumed by this inductor is:

18.  In a purely capacitive circuit the current:

19.  Figure shows the waveshapes of voltage, current and power for a purely capacitive circuit: In this circuit, the current:

20.  The capacitive reactance of a capacitor can be determined using the formula: In the formula the symbol ‘f’ stands for the:

21.  A 16 uF capacitor has been connected to a 230 V 50 Hz supply. The capacitive reactance of this capacitor in this circuit will be approximately:

22.  When two capacitors are connected in series, the total capacitance:

23.  When two capacitors are connected in parallel, the total capacitance:

24.  An 22 uF capacitor has been connected in series with a 47 uF capacitor. The total capacitance of the combination is approximately:

25.  An 16 uF capacitor has been connected in parallel with a 22 uF capacitor. The total capacitance of the combination is approximately:

26.  Two 10 uF capacitors have been connected in parallel across a 230 V AC supply. The current drawn from the supply will be approximately:

27.  The average power consumed by a purely capacitive circuit:

28.  Figure shows a resistor and an inductor connected in series across an AC supply: In this circuit, the current will:

29.  Figure shows the phasor diagram for an AC circuit with resistor and capacitor in series: The diagram shows that in this type of circuit, the current phasor:

30.  In an AC circuit containing resistance, inductance and capacitance in series, the voltage drop across the inductor will:

31.  The following phasor diagram is for a resistor, inductor and capacitor connected in series across an AC supply: The value of the phase angle F is:

32.  The following formula can be used to determine the impedance of an AC circuit with resistance, inductance and capacitance in series: Z = √(R^{2} + (X_{L} – X_{C})^{2}) In the formula, the term XL stands for the value of the:

33.  A resistance of 50 Ω has been connected in series with an inductive reactance of 160 Ω and a capacitive reactance of 40 Ω. The impedance of the circuit will be:

34.  In a parallel AC circuit, the voltage is:

35.  Figure shows a resistor and inductor connected in parallel across an AC supply: In this circuit, the current through the inductor will:

36.  Figure shows a resistor connected in parallel, with an inductor and resistor in series, across an AC supply. In this circuit, the current through the inductor will:

37.  Figure 10 shows the phasor diagram for a resistor and capacitor connected in parallel across an AC supply: In this circuit, the current through the capacitor:

38.  When drawing the phasor diagram for R, L and C in parallel across an AC supply, the reference phasor is normally the:

39.  In an, AC circuit with R, L and C in parallel, the total supply current is:

40.  A resistance of 57.5 Ω has been connected to a 230 V 50 Hz supply, in parallel with an inductive reactance of 57.5 Ω and a capacitive reactance of 230 Ω. The total supply current will be:

41.  An AC circuit with R, L and C in parallel, has the following branch currents. Resistive branch – 12 A Inductive branch – 11 A Capacitive branch – 6 A The phase angle between the supply voltage and the supply current will be approximately:

42.  When resistance and inductance are combined in one circuit, there will be a value of power consumed that is dependent on the:

43.  The true power consumed by a singlephase AC circuit can be determined using the formula:

44.  In an AC the product of the measured line voltage and line current is called the:

45.  The reactive power in an AC circuit is sometimes called:

46.  Figure shows the power triangle for an AC circuit: In the diagram, the side marked ‘S’ represents the:

47.  In an AC circuit, the power factor is the factor by which the apparent power is multiplied to obtain the:

48.  For all electrical power work with sinusoidal waveforms, the power factor is equal to the:

49.  Generally, the lower the value of the power factor in an AC circuit, the:

50.  One of the major causes of a low power factor is:

51.  The power factor of an AC circuit can be found using the formula, Power factor = :

52.  A single phase motor draws 2.175 A from a 230 V supply. A wattmeter in the circuit shows 400 W. The power factor of this circuit is approximately:

53.  An inductor draws 11.5 A on 230 V DC and 5.75 A when connected to 230 V AC. The angle of lag between the voltage and current when on AC will be:

54.  Look at the following diagram: When the switch S1 is closed in figure, the reading on the ammeter will:

55.  Look at the following diagram: When the switch S1 is closed in figure, the power factor of the circuit will:

56.  Figure shows the phasor diagram of an electric motor connected to 230 V AC supply: If a capacitor is connected in parallel with the motor, the phasor to represent the capacitor current would be drawn:

57.  A singlephase 230 V 50 Hz induction motor draws 7.5 A at 0.6 power factor. If a 47 μF capacitor is connected across the line, then the combined line current will be approximately:

58.  The purpose of using capacitors to improve the power factor is to provide a:

59.  When using a power triangle to solve AC circuits the reactive power can be found using the formula: Q = V I √1 – PF^{2}) In the formula the symbol PF stands for the:

60.  When an electrical circuit has its power factor corrected to unity, the current is:

61.  In an AC circuit, when the capacitive reactance and inductive reactance are exactly equal, the circuit is said to be:

62.  The major characteristics of the series resonant circuit are a power factor of unity and a:

63.  When an inductor and capacitor are connected in parallel and their respective reactances are equal, the reactive currents are:

64.  When the supply frequency to a parallel resonant circuit is varied, the resistance in the circuit is unchanged but the impedance will be:

65.  In an AC circuit at resonance, energy is being transferred back and forth from the:

66.  A 10 Ω resistor, 0.25 H inductor and a 40.52 μF capacitor have been connected in series across a variable frequency AC supply. The resonant frequency of the circuit will be:
