Basic Electrical Practice MCQ Question and Answer | ITI ELECTRICIAN

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ITI ELECTRICIAN | Basic Electrical Practice MCQ

1.

How many electrons are there in the third cell of the copper atom?

1. 8
2. 13
3. 18
4. 29

2.

Which is the semiconductor material?

1. Eureka
2. Ebonite
3. Manganin
4. Germanium

3.

What is the indication of neon polarity indicator used for checking A.C. supply?

1. Both electrodes will glow
2. Only one electrode will glow
3. Both electrodes will be flickering
4. One electrode will glow and another will be flickering

4.

Calculate the electrical energy in unit consumed by 500W lamp for 5 hours.

1. 0.5 unit
2. 1.0 unit
3. 1.5 unit
4. 2.5 unit

5.

What is the value of hot resistance of a bulb rated as 100W/250V?

1. 31.25 ohm
2. 62.50 ohm
3. 312.50 ohm
4. 625.00 ohm

6.

Which law states that in closed electric circuit, the applied voltage is equal to the sum of the voltage drops?

1. Ohm’s law
2. Laws of resistance
3. Kirchhoff’s first law
4. Kirchhoff’s second law

7.

Calculate the total power of the circuit of two lamps rated as 200W/240V are connected in series across 240V supply?

1. 50 W
2. 100 W
3. 200 W
4. 400 W

8.

What is the formula for the equivalent resistance (RT) of the three resistors R1, R2 & R3 are connected in parallel circuit?

1. RT = R1 + R2 + R3
2. RT =1/𝑅1 + 1/𝑅2 + 1/𝑅3
3. RT = 1/𝑅1+𝑅2+𝑅3
4. RT =1 / (1/𝑅1 + 1/𝑅2 + 1/𝑅3)

9.

What is the reading of ohmmeter across opened ‘R2’ resistor?

1. Indicate zero reading
2. Indicate infinite resistance
3. Total resistance value of the circuit
4. Value of sum of the resistance of R1 and R3 only

10.

What is the change of resistance value of the conductor as its diameter is doubled?

1. Increases to two times
2. Decreases to four times
3. Decrease to half of the value
4. No change in value of resistance

11.

What is the name of the resistor?

1. Metal film resistor
2. Wire wound resistor
3. Carbon – film resistor
4. Carbon composition resistor

12.

Calculate the resistance value of the resistor by colour coding method.

1. 23 x 103 W ± 5%
2. 26 x 103 W ± 10%
3. 32 x 104 W ± 10%
4. 37 x 104 W ± 5%

13.

Why the ohmmeter is graduated with nonlinear scale?

1. Voltage is directly proportional to resistance
2. Current is inversely proportional to resistance
3. Resistance is inversely proportional to the square of current
4. Voltage is directly proportional to the square of the current

14.

Calculate the value of unknown resistance ‘RDC’ in the Wheatstone bridge network, If PAB = 500W, QBC = 300W, SAo = 15W, at balanced condition.

1. 12
2. 9
3. 6
4. 3

15.

Which material is having negative temperature co-efficient property?

1. Mica
2. Eureka
3. Copper
4. Manganin

16.

What electrical quantities are related in Ohm’s law?

1. Current, resistance and power
2. Current, voltage and resistivity
3. Current, voltage and resistance
4. Voltage, resistance and current density

17.

Calculate the value of resistance ‘R2’ in the parallel circuit.

1. 2 Ω
2. 4 Ω
3. 6 Ω
4. 8 Ω

18.

What is the effect of the parallel circuit with one branch opened?

1. Current will remain same
2. Whole circuit will not function
3. No current will flow in that branch
4. Voltage drop increase in the opened branch

19.

What is the unit of resistivity?

1. ohm / cm
2. ohm / cm2
3. ohm - metre
4. ohm / metre

20.

Which type of resistor is used for Arc quenching protection in circuit breakers?

1. Varistors
2. Sensistors
3. Thermistors
4. Light dependent resistor (LDR)

21.

Calculate the value of resistance by colour coding method.

1. 22 x 103 ± 10%
2. 23 x 104 ± 10%
3. 25 x 103 ± 5%
4. 36 x 104 ± 5%

22.

Calculate the unknown resistance “RDC” in the Wheatstone bridge circuit, if PAB=400 ohms, QBC=200 ohms and SAD=12ohms at balanced condition.

1. 4 Ω
2. 6 Ω
3. 8 Ω
4. 12 Ω

23.

What is the reading of the voltmeter V?

1. 0 V
2. 6 V
3. 9 V
4. 18 V

24.

Which is the application of series circuit?

1. Voltmeter connection
2. Lighting circuits in home
3. Shunt resistor in ammeter
4. Multiplier resistor of a voltmeter

25.

What is the effect on opened resistor in series circuit?

1. No effect in opened resistor
2. Full circuit current will flow in opened resistor
3. Total supply voltage will appear across the opened resistor
4. No voltage will appear across the opened resistor

26.

Calculate the resistance value in R3 resistor.

1. 4 Ohm
2. 6 Ohm
3. 8 Ohm
4. 12 Ohm

27.

What is the effect of the circuit, if ‘ab’ points are shorted?

1. Circuit resistance will be zero
2. Same current will flow in all branches
3. Supply voltage will exist in each branch
4. Total circuit current is equal to each branch circuit current

28.

What is the name of the resistor if its resistance value increase with increase in temperature?

1. Varistors
2. Sensistors
3. Thermistors
4. Light Dependent Resistor (LDR)

29.

What is the formula for Quantity of electricity (Q)?

1. Current x Time
2. Voltage x Current
3. Current x Resistance
4. Voltage x Resistance

30.

What is the unit of conductance?

1. Mho
2. Ohm
3. Ohm-m
4. Ohm/m

31.

Which one defines the change in resistance in Ohm(Ω) per degree centigrade (°C)?

1. Temperature effect
2. Laws of temperature
3. Temperature constant
4. Temperature co-efficient

32.

Which type of meter is used to test thepolarity of battery?

1. Moving iron ammeter
2. Moving coil voltmeter
3. Moving iron voltmeter
4. Dynamo meter type wattmeter

33.

What is the voltage drop in resistor ‘R2’ in the series circuit?

1. 5 volt
2. 10 volt
3. 15 volt
4. 20 volt

34.

Which is the application of series circuit?

1. Fuse in circuit
2. Voltmeter connection
3. Electrical lamp in homes
4. Shunt resistor in ammeter

35.

Which method is used for measuring 1 Ohm to 100K Ohm range resistance?

1. Substitution method
2. Kelvin bridge method
3. Wheat stone bridge method
4. Voltmeter and ammeter method

36.

What is the S.I unit of specific resistance?

1. Ohm/cm
2. Ohm/metre2
3. Ohm-metre
4. Micro ohm/cm2

37.

What is the value of resistance of the resistor?

1. 330 ± 5% Ohm
2. 3300 ± 10% Ohm
3. 33000 ± 5 % Ohm
4. 330000 ± 10% Ohm

38.

What is the purpose of the shunt resistor ‘R2’ used in series type Ohm meter circuit?

1. To limit the current in the circuit
2. To increase the value of meter resistance
3. To adjust the zero position of the pointer
4. To prevent the excess current in the circuit

39.

Which electrical quantity affects the heat generated in a conductor?

1. Voltage
2. Square of the current
3. Square of the resistance
4. Current passed through it

40.

What is the change in value of resistance of the conductor, if its cross section area is doubled?

1. No change
2. Decreases 2 times
3. Increases 2 times
4. Decreases 4 times

41.

Calculate the voltage drop across the resistor ‘R4’ in the circuit?

1. 48 V
2. 72 V
3. 80 V
4. 100 V

42.

What is the resistance of Light Dependent Resistor (LDR), if the intensity of light is increased?

1. Increases
2. Decreases
3. Remains same
4. Becomes infinity

43.

Which formula is used to calculate the power of a DC circuit?

1. Voltage x time
2. Current x voltage
3. Current x resistance
4. Voltage x resistance

44.

Calculate the hot resistance of 200W / 250V rated lamp.

1. 31.25 
2. 62.5 
3. 312.5 
4. 625 

45.

What is the value of resistance in an open circuit?

1. Zero
2. Low
3. High
4. Infinity

46.

Which resistor the lowest current flows in a parallel circuit having the values of 50 W 220 W, 450 W and 560 W connected with supply?

1. 50 W
2. 220 W
3. 450 W
4. 560 W

47.

What is the specific resistance value of copper conductor?

1. 1.72 Ohm/cm3
2. 1.72 Micro ohm
3. 1.72 Micro ohm/cm3
4. 1.72 Micro ohm/m

48.

Which is inversely proportional to the resistance of a conductor?

1. Length
2. Resistivity
3. Temperature
4. Area of cross section