Electrical Engineering MCQ|Objective questions Electrical Engineering|Industries Extension officer|Lecturer in Polytechnics set 2

Electrical Engineering MCQ|Objective questions Electrical Engineering|Industries Extension officer|Lecturer in Polytechnics set 2

The resistance of a parallel circuit consisting of two branches is 12 ohms. If the resistance of one branch is 18 ohms, what is the resistance of the other ? 

(a) 18 Ω (b) 36 Ω

(c) 48 Ω (d) 64 Ω

Ans :( B )

 Four wires if same material, the same cross-sectional area and the same length when connected in parallel give a resistance of 0.25 Ω. If the same four wires are connected is series the effective resistance will be 

(a) 1 Ω (b) 2 Ω

(c) 3 Ω (d) 4 Ω

Ans :( D)

 Which of the following materials has a negative temperature co-efficient of resistance?

(a) Copper (b) Aluminum

(c) Carbon (d) Brass 

Ans :( C )

 Which of the following statement is true? 

(a) A galvanometer with low resistance in parallel is a voltmeter

(b) A galvanometer with high resistance in parallel is a voltmeter

(c)A galvanometer with low resistance in series is an ammeter

(d) A galvanometer with high resistance in series is an ammeter

Ans: ( C )

 A closed switch has a resistance of 

(a) Zero (b) about 50 ohms

(c) about 500 ohms (d) infinity

Ans: ( A )

The thickness of insulation provided on the conductor depends on 

(a)The magnitude of voltage on the conductor

(b)The magnitude of current flowing through it

(c) Both (a) and (b)

(d) None of the above

Ans: ( A )

Which of the following quantities remain the same in all parts of a series circuit? 

(a) Voltage (b) Current

(c) Power (d) Resistance

Ans: ( B )

 In an electric kettle water boils in 10 minutes. It is required to boil the boiler in 15 minutes, using same supply mains 

(a) Length of heating element should be decreased

(b) Length o heating element should be increased

(c) Length of heating element has no effect on heating if water

(d) None of the above

Ans: ( A )

 Bulbs in street lighting are all connected in 

(a) Parallel (b) series

(c) series-parallel (d) end-to-end

Ans: ( A )

Sparking occurs when a load is switched off because the circuit has high 

(a) Resistance (b) inductance

(c) capacitance (d) impedance

Ans: ( B )

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Electrical Engineering MCQ|Objective questions Electrical Engineering|Industries Extension officer|Lecturer in Polytechnics set 4


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