Basic Electrical interview Questions and Answers !!!!
Basic and generalized interview Questions are provided below 👇👇👇👇👇
Q.1 If the potential at point A is higher that at point B ( Va > Vb ) then the potential difference will be _________?
A. Negative
B. Positive
C. Zero
D. 6 volt
Ans.
B. Positive
Q.2 Electromotive force is measured in _________?
A. Volt
B. Volt . Meter
C. Volt / Meter
D. Volt / coulomb
Ans.
A. Volt
Q.3 How many electrons are carried in 1 coulomb charge?
A. 6.25 × (10) 12
B. 6.25 × (10) 15
C. 6.25 × (10) 18
D. 6.25 × (10) 21
Ans.
C. 6.25 × (10) 18
Q.4 What is the unit of resistivity?
A. Ohm
B. Mho
C. Ohm . Meter
D. Ohm/ Meter
Ans.
C. Ohm . Meter
Q.5 What is the resistivity of copper at 20 ° C ?
A. 1.72 × (10) -8
B. 2.82 × (10) -8
C. 1
D. 0
Ans.
A. 1.72 × (10) -8
Q.6 What is the actual equation of ohm's law ?
A. V= I R
B. I = V / R
C. VI = R
D. V / I = R
Ans.
D. V / I = R
Q.7 What is the equation of capacitor in series connection?
A. C = C1 +C2 + C3 + .....+ Cn
B. C = --C1 --C2 --C3 --......-- Cn
C. 1/C = 1/ C1 + 1/ C2 + 1/C3 +.....+ 1/ Cn
D. C = -C1 + C2 - C3 +....- Cn
Ans.
C. 1/C = 1/ C1 + 1/ C2 + 1/ C3 +....+ 1/ Cn
Q.8 Find the passive Element....
A. Current source
B. Resistor
C. Voltage source
D. Thyristor
Ans.
B. Resistor
Q.9 Which one is not Type of current?
A. Direct current
B. Sinosuidal current
C. Fluctuating current
D. Alternating current
Ans.
B. Sinosuidal current
Q.10 What is the unit of apparent power?
A. VA
B. VAR
C. KVR
D. Watt
Ans.
A. VA
Q.11 What is the formula of power factor?
A. P.f = R / I
B. P.f = R / V
C. P.f = R / Z
D. P.f = V / I
Ans.
C. P.f = R / Z
Q.12 What is the resonance condition?
A. XL = - Xc
B. XL = Xc
C. - Xl = Xc
D. XL + Xc = 0
Ans.
B. XL = Xc
Q.13 What is the unit of conductance?
A. Ohm B. Mho
C. Ohm . m D. Ohm / meter
Ans.
B. Mho
Q.14 What is the power factor at resonance condition?
A. One B. Two
C. Three D. Zero
Ans.
A. One ( unity power factor)
Q.15 Who is the first inventor of electricity?
A. Thomas Alva Edison
B. Charles coulomb
C. Benjamin Franklin
D. J. J. Thomson
Ans.
C. Benjamin Franklin
Q.16 if the centrifugal switch of a two-value capacitor motor using two capacitors fails to open then,
(a) motor will not come up to speed
(b) motor will not carry the load
(c) current drawn by the motor will be excessively high
(d) electrolytic capacitor will, in all probability, suffer break down
Ans: d
Q.17 In a universal motor, the most common cause of brush sparking is
(a) open armature winding
(b) shorted armature winding
(c) shorted field winding
(d) high commutator mica
(e) all of the above
Ans: e
Q.18 If starting winding of a single-phase induction motor is left in the circuit, it will
(a) run faster
(b) spark at light loads
(c) draw excessive current and overheat
(d) run slower
Ans: c
Q.19 Most of the fractional horsepower motors have either
(a) hard and annealed bearings
(b) ball or roller bearings
(c) soft and porous bearings
(d) plain or sleeve bearings
Ans: d
Q.20 Which of the following statements regarding reluctance-start motor is incorrect ?
(a) It is similar to reluctance motor(b) It is basically an induction motor and not a synchronous one
(c) So far as its basic working principle is concerned, it is similar to shaded pole motor
(d) the air-gap between rotor and salient poles is non- uniform
Ans: a
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