Government Competitive Exams for Electrical Engineers Question Paper Part 1

government competitive exams  for electrical  engineers question paper part 1

1. One commercial unit of energy equals          Ans ( C )

(a) 500 watt-seconds (b) one watt-hour

(c)One kilowatt-hour (d) ten kilowatt-hour

2. The electrical energy required to heat a bucket of water 

   to a certain temperature is 4kWh.

   If the heat losses are 20 percent, the energy input is      Ans( C )

(a) 2 kWh (b) 3.2 kWh

(c) 5 k Wh (d) 6 k Wh

3. The maximum current rating for a 10kΩ, 0.5 W resistor is       Ans( B )

(a) 0.707 mA (b) 7.07 mA

(c) 14.14 mA (d) 28.28 mA

4. The substances which have a large number of free electrons

 and offer a low resistance are called      Ans ( D )

                  

(a) Insulators (b) inductors

(c)Semi-conductors (d) conductors

5. The resistance of a conductor varies inversely as      Ans( B )

(a) length (b) area of cross-section

(c) temperature (d) resistivity

6. With rise in temperature the resistance of pure metals       Ans( A )

(a) Increases (b) decreases

(c) first increases and then decreases (d) remains constant

7. The resistance of a copper wire 200 m long is 21Ω.

 If its thickness (diameter) is 0.44

mm, its specific resistance is around                    Ans ( C )

(a) 1.2 x 10-8Ω-m (b) 1.4 x 10-8Ω-m

(c) 1.6 x 10-8Ω-m (d) 1.8 x 10-8Ω-m

8. Three resistances of 10 ohms, 15 ohms and 30 ohms 

are connected in parallel. The

total resistance of the combination is         Ans ( A )

(a)5 ohms (b) 10 ohms

(c)15 ohms (d) 55 ohms

9. The resistance of two wires is 25 Ω when connected

 in series and 6 Ω when joined in

parallel. The resistance of each wire is              Ans( A )

(a)10 Ω, 15 Ω (b) 20 Ω, 30 Ω

(c) 5 Ω, 10 Ω (d) 10 Ω, 20 Ω

10. An instrument which detects electric current 

is known as        Ans( D )

(a) Voltmeter (b) rheostat

(c) watt meter (d) galvanometer

11. 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 ?      Ans ( B )

(a) 18 Ω (b) 36 Ω

(c) 48 Ω (d) 64 Ω

12. 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            Ans( D )

(a) 1 Ω (b) 2 Ω

(c) 3 Ω (d) 4 Ω

13. Which of the following materials has a negative temperature

 co-efficient of resistance?

(a) Copper (b) Aluminum

(c) Carbon (d) Brass                            Ans ( C )

14. Which of the following statement is true?                      Ans ( C )

(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

15. A closed switch has a resistance of                  Ans( A )

(a) Zero (b) about 50 ohms

(c) about 500 ohms (d) infinity

16. The thickness of insulation provided on the 

conductor depends on       Ans( A )

(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

17. Which of the following quantities remain the same in all 

parts of a series circuit?               Ans ( B )

(a) Voltage (b) Current

(c) Power (d) Resistance

18. In an electric kettle water boils in 10 minutes. It is required to boil 

the boiler in 15

minutes, using same supply mains                 Ans( A )

(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

19. Bulbs in street lighting are all connected in              Ans ( A )

(a) Parallel (b) series

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

20. Sparking occurs when a load is switched off because the 

circuit has high                  Ans ( B )

(a) Resistance (b) inductance

(c) capacitance (d) impedance