Basic Electrical Engineering MCQ: Electrical Engineering

Basic Electrical Engineering MCQ. Multiple Choice Questions with Answers highlighted on the Basics of Electrical Engineering. For Digital Marketing Questions see Digital Marketing MCQs

 

Basic Electrical Engineering MCQ

 

1)   Which of the following are the passive elements ??

a. Resistor
b. Bulb
c. Both
d. None of these

 

2)   Which of the following is/are active elements??

a. Current source
b. Voltage source
c. Both
d. None of these

 

3)   Power dissipation in an ideal inductor is ??

a. A finite value
b. Zero
c. Minimum
d. Maximum

 

 4)  If P is the power of a star connected system then what will be the power of an equivalent delta-connected system ??

a. P/3
b. 3P
c. P
d. None of the above

 

5)   The inductor does not allow the sudden change of ??

a. power
b. Voltage
c. current
d. None of the above

 

6)   Magnetic flux has the unit of ??

a. Tesla
b. Weber
c. Ampere-turn
d. Newton

 

7)   The capacitor does not allow the sudden change of ??

a. power
b. voltage
c. current
d. None of the above

 

8)   The voltage induced in an inductor is represented as ??

a. product of its inductance and rate of change of current through it
b. ratio of the current through it to its inductance
c. the ratio of its inductance to the current through it
d. product of its inductance and current through it

 

9)   The internal resistance of the ideal voltage source is ??

a. 100 ohms
b. finite
c. infinite
d. zero

 

10)   Instantaneous power in an inductor is proportional to the ??

a. Temperature of the inductor
b. square of the rate of change of current
c. square of instantaneous current
d. product of the instantaneous current and rate of change of current

 

BEE MCQ Question 

 

11)   The internal resistance of the ideal current source is ??

a. 100 ohms
b. finite
c. infinite
d. zero

 

12)   The unit of resistivity is ??

a. Ω / m²
b. Ω / metre
c. Ω – metre
d. Ω

 

13)   Which quantity should be measured by the voltmeter ??

a. Speed
b. Power
c. Voltage
d. Current

 

14)   How many coulombs of charge flow through a circuit carrying a current of 10 A in 1 minute ??

a. 1200
b. 600
c. 60
d. 10

 

15)   Which quantity consists of a unit 1KWh ??

a. Charge
b. Power
c. Time
d. Energy

 

16)   The resistance of a conductor of diameter d and length l is R Ω. If the diameter of the conductor is halved and its length is doubled, the resistance will be ??

a. 8R Ω
b. 4R Ω
c. 2R Ω
d. R Ω

 

17)   Which of the following has no units ??

a. Magnetic susceptibility
b. Magnetic Power
c. Moment of a magnet
d. Permeability

 

18)   The resistivity of the conductor depends on ??

a. type of material
b. Length of the conductor
c. area of the conductor
d. none of these

 

19)   Which of the following quantities consists of SI unit as WATT ??

a. Power
b. Current
c. Charge
d. Force

 

20)   If 1 A current flows in a circuit, the number of electrons flowing through this circuit is ??

a. 0.625 × 10-19
b. 1.6 × 10-19
c. 1.6 × 1019
d. 0.625 × 1019

 

Basic Electrical Engineering MCQ

 

21)   An instrument that detects electric current is known as ??

a. Galvanometer
b. wattmeter
c. rheostat
d. voltmeter

 

22)   Electric pressure is also called ??

a. energy
b. voltage
c. power
d. resistance

 

23)   In a circuit, a 33 Q resistor carries a current of 2 A. The voltage across the resistor is ??

a. 132 V
b. 80 V
c. 66 v
d. 33 V

 

24)   The substances which have a large number of free electrons and offer a low resistance are called ??

a. Conductors
b. semi-conductors
c. inductors
d. insulators

 

25)   A light bulb draws 300 mA when the voltage across it is 240 V. The resistance of the light bulb is ??

a. 1000 Q
b. 800 Q
c. 600 Q
d. 400 Q

 

26)   Out of the following which is not a poor conductor ??

a. Tungsten
b. Carbon
c. Copper
d. Cast iron

 

27)   The resistance of a parallel circuit consisting of two branches is 12 ohms. If the resistance of one branch is 18 ohms, what is the resistance of the other ??

a. 64 Q
b. 48 Q
c. 36 Q
d. 18 Q

 

28)   Out of the following which is an insulating material ??

a. Paper
b. Silver
c. Gold
d. Copper

 

29)   Four wires of the same material, the same cross-sectional area, and the same length when connected in parallel give a resistance of 25 Q. If the same four wires are connected in series the effective resistance will be ??

a. 400 Ω
b. 300 Ω
c. 200 Ω
d. 100 Ω

 

30)   The property of a conductor due to which it passes current is called ??

a. inductance
b. conductance
c. reluctance
d. resistance

 

Basic Electrical Engineering MCQ

 

31)   A current of 16 amperes divides between two branches in parallel of resistances 8 ohms and 12 ohms respectively. The current in each branch is ??

a. 4.6 A, 9.6 A
b. 4.6 A, 6.9 A
c. 6.4 A, 9.6 A
d. 6.4 A, 6.9 A

 

32)   Conductance is reciprocal of ??

a. capacitance
b. reluctance
c. inductance
d. resistance

 

33)   Current velocity through a copper conductor is ??

a. nearly 3 x 108 m/s
b. of the order of a few ^.s/m
c. independent of current strength
d. the same as propagation velocity of electric energy

 

34)   The resistance of a conductor varies inversely as ??

a. resistivity
b. temperature
c. area of cross-section
d. length

 

35)   Which of the following material has a nearly zero temperature coefficient of resistance ??

a. Copper
b. Carbon
c. Porcelain
d. Manganin

 

36)   With rising in temperature the resistance of pure metals ??

a. remains constant
b. first increases and then decreases
c. decreases
d. increases

 

37)   You have to replace the 1500 Q resistor in the radio. You have no 1500 Q resistor but have several 1000 Q ones which you would connect ??

a. Three in series
b. three in parallel
c. two in parallel and one in series
d. two in parallel

 

38)   With rising in temperature the resistance of semi-conductors ??

a. remains constant
b. First increases and then decreases
c. Increases
d. decreases

 

39)   Two resistors are said to be connected in series when ??

a. Sum of IR drops equals the applied e.m.f
b. total current equals the sum of branch currents
c. both carry the same value of current
d. the same current passes in turn through both

 

40)   The resistance of a copper wire 200 m long is 21 Q. If its thickness (diameter) is 0.44 mm, its specific resistance is around ??

a. 1.8 x 10″8 Q-m
b. 1.6 x 10″”8 Q-m
c. 1.4 x 10~8 Q-m
d. 1.2 x 10~8 Q-m

 

Basic Electrical Engineering MCQ

 

41)   Insulating materials have the function of ??

a. Storing very high currents
b. conducting very large currents
c. preventing an open circuit between the voltage source and the load
d. Preventing a short circuit between conducting wires

 

42)   Which of the following statement is true both for a series and a parallel D. C. circuit ??

a. Power is additive
b. Voltages are additive
c. Currents are additive
d. Elements have individual currents

 

43)   The rating of a fuse wire is always expressed in ??

a. amperes
b. kWh
c. Ampere-volts
d. Ampere-hours

 

44)   Which of the following materials has a negative temperature coefficient of resistance ??

a. Brass
b. Carbon
c. Aluminum
d. Copper

 

45)   The minimum charge on an ion is ??

a. equal to the charge of an electron
b. equal to the charge of the number of electrons in an atom (#) zero
c. equal to the atomic number of the atom
d. None Of The Above

 

46)   Ohm’s law is not applicable to ??

a. circuits with low current densities
b. high voltage circuits
c. carbon resistors
d. vacuum tubes

 

47)   In a series circuit with unequal resistances ??

a. the highest resistance has the highest voltage drop
b. the lowest resistance has the highest current
c. the lowest resistance has the highest voltage drop
d. the highest resistance has the most of the current through it

 

48)   Which is the best conductor of electricity ??

a. Carbon
b. Copper
c. Silver
d. Iron

 

49)   The filament of an electric bulb is made of ??

a. nickel
b. Tungsten
c. Aluminium
d. carbon

 

50)   For which of the following ‘ampere second’ could be the unit ??

a. Energy
b. Power
c. Charge
d. Reluctance

 

Basic Electrical Engineering MCQ

 

51)   A 3 Q resistor having 2 A current will dissipate the power of ??

a. 12 watts
b. 6 watts
c. 4 watts
d. 2 watts

 

52)   All of the following are equivalent to watt except ??

a. amperes/volt
b. amperes x voltS
c. joules/sec
d. (amperes) ohm

 

53)   Which of the following statement is true ??

a. A galvanometer with high resistance in series is an ammeter
b. A galvanometer with low resistance in series is an ammeter
c. A galvanometer with high resistance in parallel is a voltmeter
d. A galvanometer with low resistance in parallel is a voltmeter

 

54)   A resistance having a rating of 10 ohms, 10 W is likely to be a ??

a. variable resistor
b. wire wound resistor
c. carbon resistor
d. metallic resistor

 

55)   the resistance of a few meters of wire conductor in a closed electrical circuit is ??

a. very high
b. high
c. low
d. practically zero

 

56)   Which one of the following does not have a negative temperature co-efficient ??

a. Mica
b. Rubber
c. Paper
d. Aluminium

 

57)   If a parallel circuit is opened in the mainline, the current ??

a. is zero in the highest resistive branch
b. is zero in all branches
c. increases in each branch
d. increases in the branch of the lowest resistance

 

58)   Varistors are ??

a. resistors with zero temperature coefficient
b. carbon resistors
c. non-linear resistors
d. insulators

 

59)   If a wire conductor of 0.2-ohm resistance is doubled in length, its resistance becomes ??

a. 1.0-ohm
b. 0.8-ohm
c. 0.6-ohm
d. 0.4 ohm

 

60)   An electric filament bulb can be worked from ??

a. Battery supply only
b. A. C. supply only
c. D. C. supply only
d. All above

 

Basic Electrical Engineering MCQ

 

61)   Three 60 W bulbs are in parallel across the 60 V power line. If one bulb burns open ??

a. the other two bulbs will light
b. all three bulbs will light
c. rest of the two bulbs will not light
d. there will be heavy current in the mainline

 

62)   Electric current passing through the circuit produces ??

a. luminous effect
b. thermal effect
c. magnetic effect
d. chemical effect
e. all above effects

 

63)   The four bulbs of 40 W each are connected in series swift a battery across them, which of the following statement is true ??

a. The power dissipation in each bulb is not the same
b. The voltage across each bulb is not the same
c. The current through each bulb in the same
d. none of the above

 

64)   Resistance of material always decreases if ??

a. number of free electrons available become more
b. the temperature of the material is increased
c. the temperature of the material is decreased
d. none of the above is correct

 

65)   Two resistances Rl and Ri are connected in series across the voltage source where Rl>Ri. The largest drop will be across ??

a. Ri
b. Rl
c. either Rl or Ri
d. none of them

 

66)   If the efficiency of a machine is to be high, what should be low ??

a. kWh consumed
b. true component of power
c. Losses
d. input power

 

67)   A closed switch has a resistance of ??

a. infinity
b. about 500 ohms
c. about 50 ohms
d. zero

 

68)   When an electric current passes through a metallic conductor, its temperature rises. This is due to ??

a. mutual collisions between conducting electrons
b. mutual collisions between metal atoms
c. the release of conduction electrons from parent atoms
d. collisions between conduction electrons and atoms

 

69)   The hot resistance of the bulb’s filament is higher than its cold resistance because the temperature co-efficient of the filament is ??

a. about 2 ohms per degree
b. positive
c. negative
d. zero

 

70)   Two bulbs of 500 W and 200 W rated at 250 V will have a resistance ratio as ??

a. 5: 2
b. 2: 5
c. 25: 4
d. 4: 25

 

Basic Electrical Engineering MCQ

 

71)   The insulation on a current-carrying conductor is provided ??

a. to prevent leakage of current
b. to prevent shock
c. both of the above factors
d. none of the above factors

 

72)   A glass rod when rubbed with silk cloth is charged because ??

a. it gives an away positive charge
b. it gives away electrons
c. its atoms are removed
d. it takes in proton

 

73)   The thickness of insulation provided on the conductor depends on ??

a. the magnitude of voltage on the conductor
b. the magnitude of current flowing through it
c. both A. and (b)
d. none of the above

 

74)   Whether the circuit may be AC. or D. C. one, the following is most effective in reducing the magnitude of the current ??

a. Resistor
b. Inductor
c. Capacitor
d. Reactor

 

75)   Which of the following quantities remain the same in all parts of a series circuit ??

a. Resistance
b. Power
c. Current
d. Voltage

 

76)   It becomes more difficult to remove ??

a. third electron from orbit
b. the second electron from orbit
c. the first electron from orbit
d. any electron from the orbit

 

 

77)   A 40 W bulb is connected in series with a room heater. If now 40 W bulb is replaced by 100 W bulb, the heater output will ??

a. heater will burn out
b. remain the same
c. increase
d. decrease

 

78)   When one leg of a parallel circuit is opened out the total current will ??

a. become zero
b. decrease
c. increase
d. reduce

 

79)   In an electric kettle, water boils in 10 m minutes. It is required to boil the boiler in 15 minutes, using the same supply mains ??

a. Length of the heating element has no effect on heating if water
b. length of heating element should be increased
c. length of heating element should be decreased
d. none of the above

 

80)   A field of force can exist only between ??

a. two metal particles
b. two atoms
c. Two ions
d. two molecules

 

Basic Electrical Engineering MCQ

 

81)   In a lamp load when more than one lamp is switched on the total resistance of the load ??

a. Increases
b. decreases
c. remains the same
d. none of the above

 

82)   A substance whose molecules consist of dissimilar atoms is called ??

a. Insulator
b. compound
c. Super-conductoR
d. semi-conductor

 

83)   Two lamps 100 W and 40 W are connected in series across 230 V (alternating). Which of the following statement is correct ??

a. 40 W lamp will fuse
b. Both lamps will glow equally bright
c. 40 W lamp will glow brighter
d. 100 W lamp will glow brighter

 

84)   International ohm is defined in terms of the resistance of ??

a. The unit length of wire
b. a cube of copper
c. a cube of carbon
d. A column of mercury

 

85)   In the case of direct current ??

a. magnitude of current remains constant
b. the magnitude of current changes with time
c. magnitude and direction of current changes with time
d. magnitude and direction of current remains constant

 

86)   Three identical resistors are first connected in parallel and then in series. The resultant resistance of the first combination to the second will be ??

a. 3 times
b. 1/3 times
c. 1/9 times
d. 9 times

 

87)   When an electric current passes through a bucket full of water, a lot of bubbling is observed. This suggests that the type of supply is ??

a. D. C
b. A. C
c. Any of the above two
d. None of the above

 

88)   Three 6 ohm resistors are connected to form a triangle. What is the resistance between any two corners ??

a. 8/3 Q
b. 4 Q
c. 6 Q
d. 3/2 Q

 

89)   Bulbs in street lighting are all connected in ??

a. end-to-end
b. series-parallel
c. series
d. parallel

 

90)   Which method can be used for the absolute measurement of resistances ??

a. Wheatstone bridge method
b. Ohm’s law method
c. Raleigh method
d. Lorentz method

 

Basic Electrical Engineering MCQ

 

91)   For testing appliances, the wattage of the test lamp should be ??

a. any value
b. high
c. low
d. very low

 

92)   Ohm’s law is not applicable to ??

a. high currents
b. small resistors
c. D. C. circuits
d. semi-conductors

 

93)   Switching a lamp in a house produces noise on the radio. This is because switching operation produces ??

a. both mechanical noise and arc between contacts
b. mechanical noise of high-intensity
c. arcs across separating contacts
d. none of the above

 

94)   Two copper conductors have equal lengths. The cross-sectional area of one conductor is four times that of the other. If the conductor having a smaller cross-sectional area has a resistance of 40 ohms the resistance of another conductor will be ??

a. 10 ohms
b. 20 ohms
c. 80 ohms
d. 160 ohms

 

95)   74. Sparking occurs when a load is switched off because the circuit has high ??

a. impedance
b. capacitance
c. inductance
d. resistance

 

96)   A nichrome wire used as a heater coil has a resistance of 2 £2/m. For a heater of 1 kW at 200 V, the length of wire required will be ??

a. 20 m
b. 40 m
c. 60 m
d. 80 m

 

97)   Copper wire of a certain length and resistance is drawn out to three times its length without change in volume, the new resistance of wire becomes ??

a. 9 times
b. 3 times
c. 1/9 times
d. unchanged

 

98)   The temperature coefficient of resistance is expressed in terms of ??

a. mhos/°C
b. ohms/ohm°C
c. mhos/ohm°C
d. ohms/°C

 

99)   When the resistance element of a heater fuses and then we reconnect it after removing a portion of it, the power of the heater will ??

a. remain constant
b. Increase
c. decrease
d. none of the above

 

100)   The number of electrons in the outermost orbit of carbon atom is ??

a. 7
b. 6
c. 4
d. 3

 

Basic Electrical Engineering MCQ

 

101)   When current flows through heater coil it glows but supply wiring does not glow because ??

a. supply wires are made of superior material
b. resistance of heater coil is more than the supply wires
c. supply wiring is covered with insulation layer
d. current through supply line flows at a slower speed

 

102)   With three resistances connected in parallel, if each dissipates 20 W the total power supplied by the voltage source equals ??

a. 60 W
b. 40 W
c. 20 W
d. 10 W

 

103)   The condition for the validity under Ohm’s law is that ??

a. Temperature at the positive end should be more than the temperature at the negative end
b. Resistance must be wire wound type
c. current should be proportional to the size of the resistance
d. resistance must be uniform

 

104)   A thermistor has ??

a. variable temperature coefficient
b. zero temperature coefficient
c. negative temperature coefficient
d. positive temperature coefficient

 

105)   Which of the following statement is correct ??

a. A semiconductor is a material made of alternate layers of conducting material and insulator
b. A semi-conductor is one that conducts only half of the applied voltage
c. A semiconductor is a material that has conductivity having an average value of conductivity of metal and insulator
d. A semiconductor is a material whose conductivity is the same as between that of a conductor and an insulator

 

106)   If/, R and t are the current, resistance, and time respectively, then according to Joule’s law heat produced will be proportional to ??

a. I2R2t*
b. I2R2t
c. I2Rf
d. I2Rt

 

107)   A rheostat differs from a potentiometer in the respect that it ??

a. offers a large number of tapping
b. has a large number of turns
c. has a higher wattage rating
d. has a lower wattage rating

 

108)   Nichrome wire is an alloy of ??

a. copper and silver
b. nickel and chromium
c. Chromium and vanadium
d. Lead and zinc

 

109)   An open resistor when checked with an ohm-meter reads ??

a. Low but not zero
b. high but within tolerance
c. Infinite
d. zero

 

110)   When a voltage of one volt is applied, a circuit allows one microampere current to flow through it. The conductance of the circuit is ??

a. 1 milli-mho
b. 106 mho
c. 1 n-mho
d. none of the above

 

Basic Electrical Engineering MCQ

 

111)   are the materials having electrical conductivity much less than most of the metals but much greater than that of typical insulators ??

a. Variable resistors
b. Semi-conductors
c. Thermistor
d. Varistors

 

112)   Which of the following can have a negative temperature coefficient ??

a. Electrolytes
b. Metallic alloys
c. Liquid metals
d. Compounds of silver

 

113)   All good conductors have high ??

a. thermal conductivity
b. reluctance
c. resistance
d. conductance

 

114)   Conductance : mho :: ____________ ??

a. lumen: steradian
b. Inductance: farad
c. capacitance: henry
d. resistance: ohm

 

115)   Voltage-dependent resistors are usually made from ??

a. Graphite
b. Nichrome
c. Silicon Carbide
d. Charcoal

 

116)   1 angstrom is equal to ??

a. 10~14 m
b. 10″10 m
c. 10″6 cm
d. 10-8 mm

 

117)   Voltage-dependent resistors are used ??

a. as current stabilizers
b. as heating elements
c. to suppress surges
d. for inductive circuits

 

118) One-newton meter is the same as ??

a. One joule second
b. five joules
c. one joule
d. One watt

 

119)   The ratio of the mass of the proton to that of an electron is near ??

a. 4
b. 30
c. 325
d. 1840

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