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Basic Electrical Engineering MCQs. We covered all the Basic Electrical Engineering MCQs in this post for free so that you can practice well for the exam.
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MCQ on Basic Electrical Engineering for Students
The force acting on a current-carrying wire placed in a magnetic field is strongest when
a) the current flows at a right angle to the magnetic field
b) the current flows perpendicular to the field, producing minimal force
c) the current and magnetic field move in opposite directions
d) the current and field are aligned in the same direction
Option a – the current flows at a right angle to the magnetic field
The reciprocal of total resistance in a parallel circuit is equal to
a) the sum of the reciprocals of each individual resistor
b) the inverse of the product of all resistors
c) the reciprocal of the total resistance value
d) None of the above
Option a – the sum of the reciprocals of each individual resistor
If the current through a resistor is doubled, assuming temperature stays constant, what is the percentage rise in power?
a) 100%
b) 200%
c) 300%
d) 400%
Option c – 300%
The total resistance in a series circuit is equal to
a) the sum of the resistances of each component
b) the total of the reciprocals of each resistance
c) the product of all resistance values
d) the highest resistance among them
Option a – the sum of the resistances of each component
A household using an air conditioner (2000 W), a fan (500 W), and multiple computers (each 30 W, totaling 40 computers) on a 220V line would require a fuse rated
a) 10 A
b) 15 A
c) less than 20 A
d) less than 5 A
Option c – less than 20 A
Appliances are connected in __________ while the fuse is connected in __________.
a) series; series
b) parallel; parallel
c) series; always in appliances
d) parallel; always in fuse
Option a – series; series
Potential difference refers to
a) work done to move a unit charge per unit time
b) the space between two terminals
c) the length of the conducting wire
d) the energy required to move a unit charge
Option d – the energy required to move a unit charge
When using a cooler rated 1500 W and a fan rated 500 W on 200V supply, what fuse rating should be used?
a) 2.5 A
b) 5.0 A
c) 7.5 A
d) 10 A
Option d – 10 A
A fuse wire keeps blowing when used with a quality heater. What should be done?
a) Use a longer wire
b) Use a wire with smaller radius
c) Use a shorter wire
d) Use a wire with greater radius
Option d – Use a wire with greater radius
A rheostat is a device primarily used to adjust
a) voltage
b) current
c) resistance
d) power
Option b – current
Why are alloy wires used in electric irons?
a) They resist oxidation at elevated temperatures
b) They don’t burn even at high heat
c) Both of the above
d) Neither of the above
Option c – Both of the above
A student records an energy use of 36,000 joules in one hour. What is the electrical energy in kWh?
a) 36 kWh
b) 100 kWh
c) 0.001 kWh
d) 0.01 kWh
Option d – 0.01 kWh
To increase resistance in an electric circuit, a resistor should be added in
a) parallel
b) series
c) either series or parallel
d) only parallel
Option b – series
The heat produced when current flows through a conductor can be calculated using
a) H = I²Rt
b) H = VIt
c) H = V²t/R
d) All of the above
Option d – All of the above
What two forms of energy are emitted by the filament in an electric bulb?
a) electricity and light
c) heat and electricity
d) only electricity
In which direction does conventional current flow?
a) from the negative to the positive terminal
b) from the positive to the negative terminal
c) in any arbitrary direction
d) in both directions simultaneously
Option b – from the positive to the negative terminal
Which of the following is true about discharge lamps?
(i) They use a tube filled with gas at low pressure
(ii) The emitted light is always white, regardless of the gas
a) Only (i) is correct
b) Only (ii) is correct
c) Both (i) and (ii) are correct
d) Both (i) and (ii) are incorrect
Option a – Only (i) is correct
Two identical spheres, A and B, carry charges of -5 C and -16 C, respectively. Which is at a higher potential?
a) The -5 C sphere
b) The -16 C sphere
c) Both have the same potential
d) Cannot be determined
Option a – The -5 C sphere
The direction of force on a conductor carrying current in a magnetic field depends on
a) the direction of current only
b) the direction of the magnetic field only
c) both current and magnetic field directions
d) neither of them
Option c – both current and magnetic field directions
We covered all the basic electrical engineering MCQs above in this post for free so that you can practice well for the exam.
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