Basic Electrical Engineering MCQs

Basic Electrical Engineering MCQ’s | Electrical Engineering Interview Questions and Answers

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Basic Electical Engineering MCQ’s:

Multiple Choice Questions & Answers (MCQs) in Basic Electrical Engineering with a detailed explanation of every question. Electrical Engineering Objective Questions MCQ … of resources on basic electrical engineering, electronics engineering, and control systems . Electrical Engineering MCQ questions and answers for an engineering student to practice, GATE exam, interview, competitive examination and entrance exam.Basic Electrical engineering objective questions(MCQs) and answers for competitive exams. Useful for students, freshers, students preparing for semester​ .

Q1.The unit of electrical energy is / are

a. Joules
b. Watt – sec
c. Kilowatt – hour
d. All of these

Option D – All of these

Q2.If a current of 5A flows through a resistor of 12 ohm then the power developed and the energy dissipated in 2 minutes are

a. 300 W, 36000 J
b. 360 W, 30000 J
c. 380 W, 35000 J
d. 380 W, 36000 J

Option A -300 W, 36000 J

Q3.At low temperature, the semi conductor behaves as a

a. Perfect insulator
b. Perfect conductor
c. Perfect consulator
d. None of these

Option C – Perfect consulator

Q4.To move electrons from valence band to conduction band, the energy applied to the insulator is

a. Less than 15 eV
b. Equal to 15 eV
c. More than 15 eV
d. More than 25 eV

Option C – More than 15 eV

Q5.Reduced voltage can be applied across the stator circuit by

a. Using an autotransformer
b. Connecting resistor in series with stator winding
c. Connecting inductor in series with stator winding
d. All of these

Option D – All of these

Q6.In India, direct – on – line starter can be used for 3 – phase squirrel cage induction motor up to the rating of

a. 5 HP
b. 10 HP
c. 15 HP
d. 25 HP

Option A – 5 HP

Q7.In voltaic cell, anode and cathode of the cell is

a. copper electrode, zinc
b. zinc, copper
c. aluminium, zinc
d. nickel, cobalt

Option A – copper electrode, zinc

Q8.Electric bell consists of a

a. Horse shoe type electromagnet
b. Circular electromagnet
c. Rod shaped electromagnet
d. All of these

Option A – Horse shoe type electromagnet

Q9.In a gas filled lamp, inert gases are filled in the lamp to

a. Compensate heat losses
b. Minimize the electricity use
c. Increase the brightness
d. None of these

Option A – Compensate heat losses

Q10.The advantage of skewing in induction motor is / are

a. Motor runs smoothly as the magnetic hum is reduced
b. The tendency of the rotor teeth to remain under the stator teeth due to direct magnetic attraction is reduced
c. More uniform torque is obtained while running
d. All of these

Option D – All of these

Q12.If R1 is the primary winding resistance and R2 is the secondary winding resistance then the equivalent resistance of the transformer as referred to the primary is

a. R1+ R2/K2
b. R2+ R1/K2
c. R1+ K2R2
d. R2+ K2R1

Option A – R1+ R2/K2

Q13.If ∅m is the maximum value of flux in the core then the average rate of change of flux is

a. f∅m
b. 2 f∅m
c. 4 f∅m
d. 4.44 f∅m

Option C – 4 f∅m

Q14.If Kf, Kc and Kd are the coefficient of form factor, pitch factor and distribution factor respectively then the rms value of induced emf per phase is given by

a. KfKcKd f ∅T
b. 1.414KfKcKd f ∅T
c. 4KfKcKd f ∅T
d. 1.11KfKcKd f ∅T

Option C – 4KfKcKd f ∅T

Q15.In case of a synchronous generator, armature winding and field winding are

a. Both stationary
b. Stationary, rotating
c. Rotating, stationary
d. Both rotating

Option B – Stationary, rotating

Q16.In a 3 – phase star connected balanced induction motor, the line voltage is equal to the

a. 3 times the phase voltage
b. √3 times the phase voltage
c. 1/√3 times the phase voltage
d. 1/3 times the phase voltage

Option B -√3 times the phase voltage

Q17.Commutator motors have

a. Absolutely uniform torque
b. Approximately uniform torque
c. Non – uniform torque
d. None of these

Option C – Non – uniform torque

Q18.Necessity of earthing is to

a. Protect the human being from shock
b. Maintain the line voltage
c. Protect tall building
d. All of these

Option D – All of these

Q19.The ratio of maximum value to effective value of an alternating quantity is called

a. Crest factor
b. Peak factor
c. Amplitude factor
d. All of these

Option D – All of these

Q20.The terminal voltage in the separately excited generators is given by

a. V = Eg – Ia Ra
b. V = Eg + Ia Ra
c. V = Eg – Ia Ra – If Ra
d. V = Eg + Ia Ra – If Ra

Option A – V = Eg – Ia Ra

Q21.In Fleming’s right hand rule, the direction of the induced emf in the conductor is given by

a. Index figure
b. Middle figure
c. Thumb
d. None of these

Option B – Middle figure

Q22.The most common waveforms of ac is

a. Square
b. Triangular
c. Sinusoidal
d. Saw tooth

Option C – Sinusoidal

Q23.The equation for electric flux density is given by

a. D = εV
b. D = εE
c. D = ε/E
d. D = ε/V

Option B – D = εE

Q24.The unit of magnetic flux is

a. Maxwell
b. Weber
c. Weber – m
d. Only (a) and (b)

Option D -Only (a) and (b)

Q25.Electrical appliances which works on the electromagnetic principle is / are

a. Generators
b. Motors
c. Transformers
d. All of these

Option D -All of these

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