100 Electrician Recruitment Exam Question Papers with Answers
Total 100 Electrician Recruitment Exam Questions with Answers published here, which is useful for preparing upcoming ITI / Diploma Electrician Recruitment Exam Govt/Private
Electrician Recruitment Exam Question Papers with Answers- Part 1
Question1:-The relation between various electrical quantities in a dc circuit is given
below. Choose the correct option.
(i) I = V/R
(ii) I = P/V
A:-(i) only
B:-(ii) only
C:-Both (i) and (ii)
D:-None of the above
Correct Answer:- Option-C
Question2:-SI units of electric power is
A:-Watts
B:-Joule
C:-Watts/sec
D:-Kilowatt-hour
Correct Answer:- Option-A
Question3:-Two lamps 220 V, 100 watts and 220 V, 40 watts are connected in
series. When connected to a 220 V supply which lamp will glow more brightly?
A:-220 V, 100 W
B:-220 V, 40 W
C:-Both lamps will glow with equal brightness
D:-None will glow
Correct Answer:- Option-B
Question4:-Which of the following properties does not hold good for a parallel
circuit?
A:-Voltages are additive
B:-Powers are additive
C:-Branch currents are additive
D:-Conductances are additive
Correct Answer:- Option-A
Question5:-Two bulbs 250 V, 100 watts and 250 V, 60 watts are connected in
parallel to 250 volts supply. Total energy consumed by this circuit for 5 hours
continuous operation for one day is
A:-800 kWh
B:-80 kWh
C:-8 kWh
D:-0.8 kWh
Correct Answer:- Option-D
Question6:-N number of resistors each of value R are connected in series. When
these resistances are connected in parallel, the equivalent resistance is decreased
by
A:-2 N
B:-N
C:-1/
D:-N/2
Correct Answer:- Option-C
Question7:-A Nichrome wire with a uniform cross-section has a resistance R ohm.
What will be the resistance of another wire with the same material but length and
cross-section both doubled?
A:-R
B:-2R
C:-4R
D:-R/4
Correct Answer:- Option-A
Question8:-A 5Ω resistance is connected across a battery of 6V having an internal
resistance of 1Ω. What is the current through the resistance?
A:-1.2 A
B:-1 A
C:-7.2 A
D:-5 A
Correct Answer:- Option-B
Question9:-An unknown resistance is connected in series with a combination of 60
Ω and 30 Ω in parallel. When a voltage of 220 V is applied across the whole circuit it
is found that the circuit current is 10 A. What is the value of unknown resistance?
A:-2 Ω
B:-1 Ω
C:-3 Ω
D:-4 Ω
Correct Answer:- Option-A
Question10:-250V, 200 W incandescent lamp connected to a 250 V variable dc
supply is made to verify Ohm’s law. The lamp is turned on by applying variable
voltage and its resistance is measured. The result obtained indicates that “Ohm’s
law is not satisfied”. The reason may be :
A:-Variable voltage applied
B:-Temperature is not constant
C:-Both (1) and (2)
D:-None of these
Correct Answer:- Option-B
Question11:-Force between two charged bodies are represented by _________ law.
A:-Lenz’s law
B:-Biot Savart law
C:-Coulomb’s law
D:-None of these
Correct Answer:- Option-C
Question12:-The term analogous to resistance in magnetic circuit is
A:-MMF
B:-Flux
C:-Reluctance
D:-None of these
Correct Answer:- Option-C
Question13:-Direction of force on a current carrying conductor placed in a magnetic
field can be determined by
A:-Right-Hand Thumb Rule
B:-Flemings Right Hand Rule
C:-Flemings Left Hand Rule
D:-All of these
Correct Answer:- Option-C
Question14:-Calculate the energy stored in a parallel plate capacitor of capacitance
30 ÎĽF when connected to a 100 V dc supply
A:-
B:-
C:-
D:-
Correct Answer:- Option-B
Question15:-Three equal capacitors are provided. In which of the following
combinations maximum equivalent capacitance value will be obtained?
A:-When all in parallel
B:-When all in series
C:-Two in series and third one in parallel with the combination
D:-Two in parallel and third one in series with the combination
Correct Answer:- Option-A
Question16:-The relative permeability of Vacuum is __________ H/m
A:-
B:-
C:-infinity
D:-1
Correct Answer:- Option-D
Question17:-Three equal capacitances C are connected as follows. Two in series and
this combination is connected in parallel with the third one. What is the equivalent
capacitance?
A:-3 C
B:-C/3
C:-3C/2
D:-2C/3
Correct Answer:- Option-C
Question18:-Two magnetically coupled coils have a mutual inductance of 30 mH. If
the current through one coil changes from 3A to 15 mA in 3 microseconds what is
the average value of induced emf in the other coil
A:-
B:-150 V
C:-120 mV
D:-120 V
Correct Answer:- Option-D
Question19:-SI unit of magnetic flux is
A:-AT/Wb
B:-Weber
C:-Wb/S
D:-Tesla
Correct Answer:- Option-B
Question20:-Two coils of equal inductance L are placed adjacent to each other such
that magnetic f flux in coil 1 completely links with coil 2. The mutual inductance
between the coil is
A:-L
B:-2L
C:-1
D:-
Correct Answer:- Option-A
Question21:-The maximum value of sinusiodal alternating current is 20A. Find the
instantaneous value of current at 1/12th of a cycle.
A:-5A
B:-7.5A
C:-10A
D:-15A
Correct Answer:- Option-C
Question22:-Instantaneous voltage waveform is represented by . Average
voltage is given by
A:-
B:-
C:-
D:-
Correct Answer:- Option-B
Question23:-Voltage and current waveforms in an AC circuit is given by v = 100 sin
(wt+15°) and i = 10 sin (wt+60°). Which of the following statement is true?
A:-Voltage leads current by 45°
B:-Current leads voltage by 45°
C:-Current leads voltage by 60°
D:-Voltage leads current by 15°
Correct Answer:- Option-B
Question24:-The equation for instantaneous current in a circuit with resistance
carrying a current of 10 from 230 V, 50 Hz AC supply is given by
A:-10 sin 100
B:-
C:-
D:-
Correct Answer:- Option-D
Question25:-Three identical resistors of 3Ω are connected in star configuration. Find
the equivalent resistances in delts connected configuration
A:-1Ω
B:-1.5Ω
C:-6Ω
D:-9Ω
Correct Answer:- Option-A
Question26:-Three identical resistors of 1Ω are connected in star configuration. Find
the equivalent resistances in delta connected configuration
A:- Ω
B:-2Ω
C:-3Ω
D:- Ω
Correct Answer:- Option-C
Question27:-Reactance offered by a capacitor of capacitance 1F in 230 V 50 Hz
supply is
A:-
B:-
C:-
D:-
Correct Answer:- Option-B
Question28:-In a 3φ star connected system
i. Line voltage = phase voltage
ii. Line current = phase current
iii. Line voltage = phase voltage.
iv. Line current = phase current/
A:-i and ii
B:-ii and iii
C:-iii and iv
D:-i and iv
Correct Answer:- Option-B
Question29:-In a 3φ delta connected system
A:-Line currents are 30° behind the respective phase currents
B:-Line voltages are 30° ahead of their respective phase voltages
C:-Current in line and phase are same
D:-All the above
Correct Answer:- Option-A
Question30:-For a voltage waveform, form factor is given by
A:-Maximum voltage / RMS voltage
B:-RMS voltage / maximum voltage
C:-RMS voltage/Average voltage
D:-Maximum voltage/Average voltage
Correct Answer:- Option-C
Question31:-Compared to ordinary electrodynamometer type wattmeter, in low
power factor electrodynamometer type wattmeter which of the following statement
are true?
i. Pressure coil has low value of resistance
ii. Pressure coil has high value of resistance
iii. High value of control torque
iv. Small value of control torque
A:-i and ii
B:-ii and iii
C:-i and iii
D:-i and iv
Correct Answer:- Option-C
Question32:-A 1 mA ammeter has a resistance of 100 ohm. It is to be converted to
500 mA ammeter. The value of shunt resistance is
A:- ohm
B:- ohm
C:- ohm
D:-4.99 ohm
Correct Answer:- Option-B
Question33:-Which of the following statements are correct regarding power
measurement in a 3 phase system with balanced load and unity power factor using
2 wattmeter method
A:-Each wattmeter reads half of the total power
B:-One wattmeter reads zero and other reads total power
C:-Readings of two wattmeter are equal but opposite sign
D:-All of the above
Correct Answer:- Option-A
Question34:-Different methods to measure high resistance includes :
i. Direct deflection method.
ii. Meggar
iii. Kelvin’s Double Bridge
iv. Ammeter-voltmeter method
A:-ii only
B:-i and ii
C:-i and iv
D:-iii and iv
Correct Answer:- Option-B
Question35:-Maxwell’s inductance capacitance bridge is used for measurement of
inductance of
A:-Low Q coils (Q<1)
B:-Medium Q coils (1<Q<10)
C:-High Q coils (Q>10)
D:-Low and medium Q coils
Correct Answer:- Option-B
Question36:-Which of the following statements are true when two sinusoidal
voltages of same frequency are applied to CRO?
A:-A straight line inclined at 45° with horizontal is obtained when the two
voltages are equal and in phase
B:-A circle is obtained when the voltages are equal with a phase displacement
of 90°
C:-An ellipse is obtained when voltages are equal but with a phase shift (not
equal to 0° or 90°)
D:-All the above
Correct Answer:- Option-D
Question37:-A CT is installed in a system to measure current. The primary current
in CT depends on
A:-Load connected to the system
B:-Load connected to the secondary of the CT
C:-Both 1 and 2
D:-None of the above
Correct Answer:- Option-A
Question38:-In PT, if we increase secondary burden,
A:-Primary current increases
B:-Ratio error increases
C:-Both 1 and 2
D:-Primary current increases and ratio error decreases
Correct Answer:- Option-C
Question39:-In single phase power factor meter, which of the following statements
are true
A:-Control torque is provided by spring control
B:-When power factor meter is disconnected from the circuit, the pointer
remains at the position which it occupied at the instant of disconnection
C:-2 only
D:-both 1 and 2
Correct Answer:- Option-C
Question40:-Creeping in single phase induction type energy meter is due to
A:-Overcompensation for friction
B:-Excessive voltage across potential coil
C:-Stray magnetic field
D:-All the above
Correct Answer:- Option-D
Question41:-Which material is used as negative plates in Lead acid battery?
A:-Sponge lead
B:-Lead peroxide
C:-Lead sulphate
D:-Lead dioxide
Correct Answer:- Option-A
Question42:-Which part is loosing its weight during electrolysis?
A:-Cathode
B:-Anode
C:-Electrolyte
D:-Seperator
Correct Answer:- Option-B
Question43:-Which is used as a top layer of a solar cell?
A:-Silver
B:-Copper
C:-Silicon
D:-Aluminium
Correct Answer:- Option-C
Question44:-The electrolyte used in Carbon Zinc dry cell is
A:-Dilute sulphuric acid
B:-Ammonium chloride
C:-Potassium hydroxide
D:-Concentrated hydrochloric acid
Correct Answer:- Option-B
Question45:-What is the purpose of seperator in Lead acid battery?
A:-To provides a path for electrolyte
B:-To hold positive and negative plates firmly
C:-To avoid short circuit between negative and positive plates
D:-To keep positive and negative plates in a sequence array
Correct Answer:- Option-C
Question46:-What is the electro chemical equivalent (ECE) of copper?
A:-0.329 mg/coloumb
B:-0.329 g/coloumb
C:-1.1182 mg/coloumb
D:-1.1182 g/coloumb
Correct Answer:- Option-A
Question47:-Which type of the fire extinguisher is used for fire on electrical
equipment?
A:-Halon type
B:-Foam type
C:-Gas catridge water type
D:-Stored pressure water type
Correct Answer:- Option-A
Question48:-What is starving in extinguishing of fire?
A:-Adding fuel to the fire
B:-Using water to cool the fire
C:-Removing fuel element from the fire
D:-Preventing oxygen supply to the fire
Correct Answer:- Option-C
Question49:-Cause of buckling effect in Lead acid battery
A:-Over charging or over discharging
B:-Charging with low rate for short period
C:-Formation of sediments falling from the plate
D:-Battery is kept in discharged condition for long period
Correct Answer:- Option-A
Question50:-Fire on electrical equipments comes under
A:-Class A
B:-Class C
C:-Class D
D:-Class B
Correct Answer:- Option-C