Electric Circuits MCQs | Electric Circuits Objective Type Questions & Answers

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Questions
1 A resistor is connected across a 45 volt battery to provides 13 mA of current. The required resistance with suitable wattage rating will be
A 4.5 ohms, 1 watt
B 45 ohms, 10 watts
C 1000 ohms, 2 watts
D 45,000 ohms, 1/3 watt

Answer: 45,000 ohms, 1/3 watt
22 The formation of the hydrogen bubbles around the carbon electrode in a dry cell is
A Local action caused by chemical impurities
B Polarization caused by electrolysis
C Depolarization caused by manganese dioxide
D An advantage because it increases the voltage output

Answer: Polarization caused by electrolysis
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23 The Edison cell
A Is a primary cell
B Uses sulphuric acid electrolyte
C Has 2.5 volts output
D Has nickel and iron electrolyte

Answer: Has nickel and iron electrolyte
24 A 45-volt source with an internal resistance of 2 ohms is connected across a wire-wound resistor. The maximum power will be dissipated in the resistor when its resistance equals
A Zero
B Ohms
C 45 ohms
D Infinity

Answer: Ohms
25 If the wire which is vertical to this page has electron flow downward the conductor will have
A No magnetic field
B A counter-clockwise field in the plane of the power
C A clockwise field in the plane of the paper
D A counter-clockwise field in the plane perpendicular to the paper

Answer: A counter-clockwise field in the plane of the power
26 A solenoid is a coil which
A Acts as bar magnet only when there is no current in the conductor
B Acts as bar magnet only when the current flows in the coil
C Is similar to ring magnet because there is no air gap
D Acts as bar magnet only when it has iron core

Answer: Acts as bar magnet only when the current flows in the coil
27 Motor action in a wire conducting current can be produced
A Without any additional magnetic field
B Move the conductor from weaker field toward stronger field
C Move the conductor from stronger field toward a weaker field
D Produce the motion of the conductor but not rotation

Answer: Move the conductor from stronger field toward a weaker field
28 Which of the following can produce maximum induced voltage?
A 1-amp. D.c. current
B 50-amp. D.c. current
C 1-amp. 60 cycles a.c. current
D 1-amp. 490 cycles a.c. current

Answer: 1-amp. 490 cycles a.c. current
29 An alternating current can induce voltage because it has
A High r.m.s. value
B Varying magnetic field
C Stronger field than direct current
D Constant magnetic field

Answer: Varying magnetic field
30 The d.c. resistance of a coil made with 100ft of gauge No. 30 copper wire is approximately
A Less than one ohm
B 10.5 ohms
C 104 ohms
D More than 1 M Ω

Answer: 10.5 ohms
31 Inductive resistance is measured in ohms because it
A Reduces the amplitude of alternating current
B Increases the amplitude of alternating current
C Increases the amplitude of direct current
D Has a back e.m.f. opposing the voltage output of a battery

Answer: Reduces the amplitude of alternating current
32 An arc across the switch opening an R-L circuit is a result is a result of the
A Long time constant
B Large self-induced voltage across the inductance
C Source of the voltage caused by IR drop across the resistance
D Low resistance of the open switch

Answer: Large self-induced voltage across the inductance
33 Alternating current in the inductance will produce maximum induced voltage when the current has its
A Maximum value
B Maximum change in magnetic field
C Minimum change in magnetic field
D 0.707 × Peak

Answer: Maximum change in magnetic field
34 Which of the following statements is true?
A Iron core has maximum eddy-current losses
B Laminated iron core has minimum eddy-current losses
C Power-iron core has the maximum eddy-current losses
D Air core has the minimum eddy-current

Answer: Air core has the minimum eddy-current
35 Which of the following statements is true?
A Ceramic capacitors must be connected in the correct polarity
B Electrolytic capacitor must be connected in the correct polarity
C Mica capacitors are available in capacitance value of 1 to 10 micro-farad
D Air capacitors have a blackband to indicate the outside foil

Answer: Electrolytic capacitor must be connected in the correct polarity
36 The amount of capacitive reactance with higher frequencies
A Decreases
B Increases
C Remains same for frequencies
D Decreases as the voltage increases

Answer: Decreases
37 In sine wave a.c. circuit with Xc and R in series, the
A Voltages across R and Xc are in phase
B Voltages across R and Xc are 180° out of phase
C Voltages across R leads the voltages across Xc by 90°
D Voltage across R lags the voltage across Xc by 90°

Answer: Voltages across R leads the voltages across Xc by 90°
38 In a series L-C circuit at the resonant frequency the
A Current is minimum
B Voltage across C is minimum
C Impedance is maximum
D Current is maximum

Answer: Current is maximum
39 A ferrite core has less eddy-current loss than an iron core because ferrites have
A Low resistance
B High resistance
C Low permeability
D High hysteresis

Answer: High resistance
40 With stray capacitance of 10μF, the capacitive reactance at 160 MHz equals
A 10 ohms
B 160 ohms
C 100 ohms
D 1000 ohms

Answer: 100 ohms

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