Basic Electrical Engineering MCQ And Answers For SPPU Exam 2020 Part1

1. The force between two charges is 120 N. If the distance between the charges is doubled, the force will be

1. 60 N
2. 30 N
3. 40 N
4. 15 N

Ans: b

2. The electric field intensity at a point situated 4 metres from a point charge is 200 N/C. If the distance is reduced to 2 metres, the field intensity will be

1. 400 N/C
2. 600 N/C
3. 800 N/C
4. d 1200 N/C

Ans: c

3. The lines of force due to charged particles are

1. always straight
2. always curved
3. sometimes curved
4. none of the above

Ans: b

4. The electric field at a point situated at a distance d from straight charged conductor is

1. proportional to d
2. inversely proportional to d
3. inversely proportional to d
4. none of the above

Ans: b

 5)The direction of electric field due +0 positive charge is .

1. away from the charge
2. towards the charge
3. both (a) and (b)
4. none of the above

Ans: a

6. A field line and an equipotential surface are

1. always parallel
2. always at 90°
3. inclined at any angle 0
4. none of the above

Ans: b

7. The ability of charged bodies to exert force on 6ne another is attributed to the existence of

1. electrons
2. protons
3. neutrons
4. electric field

Ans: d

8. If the sheet of a bakelite is inserted between the plates of an air capacitor, the capacitance will

1. decrease
2. increase
3. remains unchanged
4. become zero

Ans: b

9. A capacitor stores 0.24 coulombs at 10 volts. Its capacitance is

      a 0.024

      b 0.12 F

3. 0.6 F
4. 0.8 F

Ans: a

10. For making a capacitor, it is better to select a dielectric having

1. low permittivity
2. high permittivity
3. permittivity same as that of air
4. permittivity slightly more than that of air

Ans: b

11. The units of capacitance are

1. volts/coulomb
2. coulombs/volt
3. ohms
4. henry/Wb

Ans: b

12. If three 15 uF capacitors are connected in series, the net capacitance is

a 5 uF

b 30 uF

3. 45 uF
4. 50 uF

Ans: a

13. If three 10 uF capacitors are connected in parallel, the net cararitance is

1. 20 uF
2. 30 uE
3. 40 uF
4. 50 uF

Ans: b

14. A dielectric material must be

1. resistor
2. insulator
3. good conductor
4. semi conductor

Ans: b

15. An electrolytic capacitor can be used for

1. D.C. only
2. AC. only
3. both D.C. as well as A.C.

Ans: a

16. The capacitance of a capacitor is not affected by

a distance between plates

b. area of plates

3. thickness of plates
4. all of the above

Ans: c

17. Which of the following is not a vector ?

1. Linear momentum
2. Angular momentum
3. Electric field
4. Electric potential

Ans: b

18)Two plates of a parallel plate capacitor after being charged from a constant voltage source are separated apart by means of insulated handles, then the

1. Voltage across the plates increases
2. voltage across the plates decreases
3. charge on the capacitor decreases
4. charge on the capacitor increases

Ans: b

19. If A.C. voltage is applied to capacitive circuit, the alternating current can flow in the circuit because

1. varying voltage produces the charg¬ing and dicharging currents
2. of high peak value
3. charging current can flow
4. discharge current can flow

Ans: a

20. Voltage applied across a ceramic dielectric produces an electrolytic field 100 times greater than air. What will be the value of dielectric constant ?

a. 50  

b. 100

c. 150

d. 200

Ans: b

21. Which of the following statements is correct ?

a. Air capacitors have a blackband to indicate the outside foil

b. Electrolytic capacitor must be con¬nected in the correct polarity

3. Ceramic capacitors must be con¬nected in the correct polarity
4. Mica capacitors are available in capacitance value of 1 to 10 pF

Ans: b

22. The dissipation factor of a good dielectric is of the order of

(a) 0.0002

(b) 0.002

(c) 0.02

(d) 0.2

Ans: a

23. "The total electric flux through any closed surface surrounding charges is equal to the amount oflcharge enclosed".

The above statement is associated with

1. Coulomb's square law
2. Gauss's law
3. Maxwell's first law
4. Maxwell's second law

Ans: b

24. Three capacitors each of the capacity C are given. The resultant capacity 2/3 C can be obtained by using them

1. all in series
2. all in parallel
3. two in parallel and third in series with this combination
4. two in series and third in parallel across this combination

Ans: c

25. For which of the following parameter variation, the capacitance of the capacitor remains unaffected ?

1. Distance between plates
2. Area of the plates
3. Nature of dielectric
4. Thickness of the plates

Ans: d

26. Which of the following statement is true ?

1. The current in the discharging capacitor grows linearly
2. The current in the dicharging capacitor grows exponentially
3. The current in the discharging capacitor decays exponentially
4. The current in the discharging capacitor decreases constantly

Ans: b

27. Which of the following expression is correct for electric field strength ?

1. E = D/E
2. E = D2/t
3. E = jtD
4. E= nD2

Ans: a

28. In a capacitor the electric charge is stored in

1. metal plates
2. dielectric
3. both (a) and (6)
4. none of the above

Ans: b

29. Which of the following materials has the highest value of dielectric constant?

1. Glass
2. Vacuum
3. Ceramics
4. Oil

Ans: c