ELECTRICAL CIRCUITS Multiple Choice Questions Part 1

1 Conventional flow assumes charges flow from

⦁

**Positive to negative**

⦁ Positive to positive

⦁ Negative to positive

⦁ Negative to negative

2 Series resonance occurs when

⦁ XL = XC

⦁ XL = R

⦁ Z = R

⦁

**Both A and C**
3 The symbol Q refers to

⦁ Resonance quotient

⦁

**Quality factor**
⦁ Power quotient

⦁ Qualification test

4 Electron flow assumes charges flow from

⦁

**Negative to positive**

⦁ Negative to negative

⦁ Positive to negative

⦁ Positive to positive

5 The ratio of W/VA in an ac circuit means

⦁

**Power factor**

⦁ Reactive factor

⦁ Quality factor

⦁ Load factor

6 At what frequency will an inductor of 5mH have the same reactance as a capacitor of 0.1 µF?

⦁

**7.12 kHz**
⦁ 7.12 Hz

⦁ 7.12MHz

⦁ 7.12 GHz

7 Property of an electric circuit that dissipates electric energy

⦁ Reactance

⦁ Impedance

⦁

**Resistance**
⦁ Conductance

8 In a resonant circuit, if Q ≤ 10 resonant frequency bandwidth.

⦁

**Bisects**
⦁ Exceeds

⦁ Is less than

⦁ Is equal to

9 Which of the following conditions is not true for a series RLC circuit at resonance?

⦁

**Z = jXL**
⦁ XL = XC

⦁ The power factor is one

⦁ The magnitude of Z is ƒR2 + (XL — XC)2

10 A tank circuit is a

⦁

**Parallel LC circuit**
⦁ Series LC circuit

⦁ A resonant circuit

⦁ A non-resonant circuit

11 A capacitive load always has a power facto

⦁

**Leading**
⦁ Lagging

⦁ Zero

⦁ Unity

12 Which is considered as the effect of a dielectric material?

⦁

**Increasing capacitance**
⦁ Decreasing capacitance

⦁ Reducing the working voltage

⦁ Increasing the distance between the plates

13 The open-circuit voltage at the terminal of load RL is 60V. Under the condition of maximum power transfer, the load voltage will be

⦁ 60 V

⦁ 15 V

⦁ 20 V

⦁

**30 V**
14 Which statement is true?

⦁ A series resonant circuit is of high impedance

⦁ A parallel resonant circuit is of low impedance

⦁

**A series resonant circuit is inductive if it operates at a frequency higher than the resonant frequency**
⦁ A parallel resonant circuit is inductive if it operates at a frequency higher than the resonant frequency

15 What is considered as the most important value of a sine wave?

⦁

**Effective value**
⦁ Peak value

⦁ Average value

⦁ Instantaneous value

16 The value of temperature coefficient (a) is dependent upon

⦁

**The nature of material and temperature**
⦁ The length of material

⦁ The cross-sectional area of the material

⦁ The volume of the material

17 At what frequency will the current in a series RLC circuit reach its maximum value for an applied voltage of 15 V with R = 500 fi, L = 100 µH and C = 0.001 µF?

⦁

**503 kHz**
⦁ 403 kHz

⦁ 603 kHz

⦁ 303 kHz

18 Which of the following does not affect resistance?

⦁ Resistivity

⦁ Cross-sectional area

⦁

**Mass**
⦁ Length

19 Which of the following is not considered a physical factor affecting resistance?

⦁ Length

⦁ Material type

⦁

**Temperature**
⦁ Cross-sectional

20 The graph between an alternating quantity and time is called

⦁ Sine wave

⦁ Curve

⦁

**Waveform**
⦁ A plot

21 Which of the following is the most popular waveform?

⦁

**Sinusoidal**
⦁ Square wave

⦁ Triangular

⦁ Sawtooth

22 What is the reciprocal of quality factor?

⦁ Power factor

⦁ Reactive factor

⦁

**Dissipation factor**
⦁ 1/Q factor

23 In liquids and gases, ionization current results from a flow of

⦁ Positive or negative ions

⦁

**Free electrons**
⦁ Ions that are lighter in weight than electrons

⦁ Protons

24 VL = VC in a series RLC circuit when

⦁

**The value of the impedance is minimum**
⦁ The power factor is zero

⦁ The current leads the total voltage by 90˚

⦁ The total voltage is zero

25 An ac series circuit is composed of a resistance of 20 fi, inductive reactance of 40 fi, and a capacitive reactance of 15 fi. If a current of 1 ampere is flowing, what is the applied voltage

⦁ 320 V

⦁

**32 V**
⦁ 220 V

⦁ 22 V

26 An intermittent and non-symmetrical alternating current like that obtained from the secondary winding of an induction coil

⦁

**Faradic current**
⦁ Transient ac current

⦁ Inductive current

⦁ Capacitive current

27 If two equal resistances connected in series across a certain supply are now connected in parallel across the same supply, the power produced will be that of series connection

⦁ One-half

⦁ One-fourth

⦁ Two times

⦁

**Four times**
28 Transient period is considered over after

⦁

**5 v**
⦁ 1 v

⦁ 100 v

⦁ 6 v

29 What rating of a resistor determines its ability to absorb heat?

⦁

**Wattage**
⦁ Ohmic

⦁ Current

⦁ Voltage

30 A capacitance of 6 µµF means

⦁

**6 pF**
⦁ 6 nF

⦁ 6 fF

⦁ 6 aF

31 The voltage cannot be exactly in phase with the current in a circuit that contains

⦁

**Only capacitance**
⦁ Only resistance

⦁ Inductance and capacitance

⦁ Inductance, capacitance and resistance

32 The charge in the capacitor is stored at the

⦁ Terminals

⦁

**Plates**
⦁ Dielectric

⦁ Air

33 The reactance curve is a plot of frequency versus for a series RLC circuit

⦁

**Current**
⦁ Voltage

⦁ Gain

⦁ Impedance

34 What is the other name of relative permittivity?

⦁ Dielectric strength

⦁ Potential gradient

⦁ Breakdown voltage

⦁

**Specific inductance capacity**
35 In a series RLC circuit

⦁

**The current lags VL by 90˚**
⦁ The current leads VL by 90˚

⦁ XL leads Xc by 90˚

⦁ Z = jXL at resonance

36 Resistor with colored bands in the body

⦁ Wire-wound resistor

⦁

**Carbon-composition resistor**
⦁ Potentiometer

⦁ Rheostat

37 What is the resonant frequency of a circuit when L of 25 microhenrys and C of 10 picofarads are in parallel?

⦁

**10.1 kHz**
⦁ 10.1 MHz

⦁ 101 MHz

⦁ 101 kHz

38 And ideal current source has an internal conductance of siemen(s)

⦁ Infinite

⦁ One

⦁

**Zero**
⦁ One million

39 For a series circuit, the higher the quality factor

⦁ The greater the bandwidth

⦁

**The narrower the passband**
⦁ The broader the resonance curve

⦁ The wider the passband

40 Which of the following is a common material used in wire-wound resistors?

⦁

**Manganin**
⦁ Carbon

⦁ Bronze

⦁ German silver wire

41 If one resistance in a series connection is open, then

⦁

**The current is zero in all the other resistances**
⦁ The current is maximum in all the other resistances

⦁ The voltage is zero across the open resistance

⦁ The voltage is infinite across the open resistance

42 What determines the magnitude of electric current?

⦁ The rate at which electrons are produced

⦁ The type of material used

⦁ The current carrying capacity of the circuit

⦁

**The rate at which electrons pass a given point**
43 Which of the following is neither a basic physical law nor deliverable from one?

⦁

**Ohm’s law**
⦁ Coulomb’s law

⦁ Kirchhoff’s first law

⦁ Kirchhoff’s second law

44 Another term for superconductor.

⦁ Generic conductor

⦁ Ultraconductor

⦁ Cryotron

⦁

**Cryogenic conductor**
45 A circuit whose parameters change with voltage or current.

⦁

**Non-linear circuit**
⦁ Linear circuit

⦁ Complex circuit

⦁ Passive circuit

46 Another term of the quality factor of the resonant circuit.

⦁

**Figure of merit**
⦁ Figure of demerit

⦁ Noise factor

⦁ Noise figure

47 Which of the following represents the energy stored in a capacitor?

⦁

**CV2/2**
⦁ 2Q2/C

⦁ C2/V

⦁ CV

48 What theorem is usually used in the analysis of transistor circuit?

⦁ Superposition theorem

⦁ Millman’s theorem

⦁ Thevenin’s theorem

⦁

**Norton’s theorem**
49 Which of the following capacitors has the highest cost per µF?

⦁ Plastic

⦁ Air

⦁ Mica

⦁

**Electrolytic**
50 Under the conditions of maximum power transfer, a voltage source is delivering a

power of 15 W to the load. What is the power generated by the source?

⦁ 60 W

⦁

**30 W**
⦁ 15 W

⦁ 4 W

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