Basic Electrical Engineering MCQ And Answers For SPPU Exam 2020 Part-2

1. The leakage resistance of ceramic capacitors is generally high
2. The stored energy in a capacitor decreases with reduction in value of capacitance
3. The stored energy in a capacitor increases with applied voltage
4. A wire cable has distributed capacitance between the conductors

Ans: b

2. Which of the following capacitors has relatively shorter shelf life ?

1. Mica capacitor
2. Electrolytic capacitor
3. Ceramic capacitor
4. Paper capacitor

Ans: b

3. The sparking between two electrical contacts can be reduced by inserting a

a capacitor in parallel with contacts

b capacitor in series with each contact

3. resistance in line
4. none of the above

Ans: a

4. In the case of a lossy capacitor, its series equivalent resistance value will be

1. small
2. very small
3. large
4. zero

Ans: c

5. The power dissipated in a pure capacitor is

(a) zero

(6) proportional to applied voltage

3. proportional to value of capacitance
4. both (b) and (c) above

Ans: a

6. In a capacitive circuit

1. a steady value of applied voltage causes discharge
2. an increase in applied voltage makes a capacitor charge
3. decrease in applied voltage makes a capacitor charge

4. none of the above

Ans: b

7. When a dielectric slab is introduced in a parallel plate capacitor, the potential difference between plates will

1. remain uncharged
2. decrease
3. increase
4. become zero

Ans: b

8. Capacitance increases with

1. increase in plate area and decrease in distance between the plates
2. increase in plate area and distance between the plates
3. decrease in plate area and value of applied voltage
4. reduction in plate area and distance between the plates

Ans: a

9. A capacitor consists of

1. two insulators separated by a con¬ductor
2. two conductors separated by an in¬sulator
3. two insulators only
4. two conductors only

Ans: b

10. A gang condenser is a

(a) polarised capacitor

(b) variable capacitor

3. ceramic capacitor
4. none of the above

Ans:c

11. A paper capacitor is usually available in the form of

1. tubes
2. rolled foil
3. disc
4. meshed plates

Ans: b

12. Air capacitors are generally available in the range

1. 10 to 400 pF
2. 1 to 20 pF
3. 100 to 900 pF
4. 20 to 100 pF

Ans: a

13. The unit of capacitance is

1. henry
2. ohm
3. farad
4. farad/m

Ans: c

14. A capacitor charged to 200 V has 2000 (iC of charge. The value of capacitance will be

(a) 10 F

(b) 10 uF

3. 100 nF
4. 1000 uF

Ans: b

15. A capacitor in a circuit became hot and ultimately exploded due to wrong con¬nections, which type of capacitor it could be ?

1. Paper capacitor
2. Ceramic capacitor
3. Electrolytic capacitor
4. Any-of the above

Ans: c

16. Energy stored in the electric field of a capacitor C when charged from a D.C source of voltage V is equal to joules

1. CV2
2. C2V
3. CV2
4. CV

Ans: a

17. The absolute permittivity of free space is given by

a. 8.854 x 1(T9 F/m)

b. 8.854 x 1(T10 F/m

c. 8.854 x KT11 F/m

d. 8.854 x 10"12 F/m

Ans: b

18. The relative permittivity of free space is given by

1. 1
2. 10
3. c. 100
4. d. 1000

Ans: a

19. Electric field intensity is a quantity

1. scalar

2. vector
3. both (a) and (6)
4. none of the above

Ans: b

20. When 4 volts e.m.f. is applied across a 1 farad capacitor, it will store energy of

1. 2 joules
2. 4 joules
3. 6 joules
4. 8 joules

Ans: d

21. The capacitor preferred for high frequency circuits is

1. air capacitor
2. mica capacitor
3. electrolytic capacitor
4. none of the above

Ans: b

22. The capacity of capacitor bank used in power factor correction is expressed in terms of

1. kW
2. kVA
3. kVAR
4. volts

Ans: c

23. While testing a capacitor with ohm-metre, if the capacitor shows charging, but the final resistance reading is appreciably less than normal, it can be concluded that the capacitor is

1. short-circuited
2. open circuited
3. alright
4. leaky

Ans: d

24. If a 6 (iF capacitor is charged to 200 V, the charge in coulombs will be

1. 800 uC
2. 900 uC
3. 1200 uC
4. 1600 uC

Ans: c

25. Which capacitor will be physically smaller for the same ratings ?

1. Ceramic capacitor
2. Paper capacitor
3. Both will be of equal size
4. None of the above