# Multiple choice question for engineering

## Set 1

1. For high frequencies, capacitor acts as _______

a) Open circuit

b) Short circuit

c) Amplifier

d) Rectifier

### View Answer

2. For very low frequencies, capacitor acts as _______

a) Open circuit

b) Short circuit

c) Amplifier

d) Rectifier

### View Answer

3. A capacitor consists of___________

a) Two conductors

b) Two semiconductors

c) Two dielectrics

d) Two insulators

### View Answer

4. Capacitor preferred when there is high frequency in the circuits is ______

a) Electrolyte capacitor

b) Mica capacitor

c) Air capacitor

d) Glass capacitor

### View Answer

5. Capacitance increases with ______

a) Increase in plate area

b) Decrease in plate area

c) Increase in distance between the plates

d) Increase in density of the material

### View Answer

6. Capacitance decreases with _________

a) Increase in distance between the plates

b) Decrease in plate area

c) Decrease in distance between the plates

d) Increase in density of the material

### View Answer

7. When the supply frequency increases, what happens to the capacitive reactance in the circuit?

a) Increases

b) Decreases

c) Remains the same

d) Becomes zero

### View Answer

8. What is the value of capacitance of a capacitor which has a voltage of 4V and ha 16C of charge.

a) 2F

b) 4F

c) 6F

d) 8F

### View Answer

9. Unit of capacitance is __________

a) Volts

b) Farad

c) Henry

d) Newton

### View Answer

10. What will happen to the capacitor when the source is removed?

a) It will not remain in its charged state

b) It will remain in its charged state

c) It will start discharging

d) It will become zero

### View Answer

## Set 2

1. Which is the correct expression for capacitance of a multi plate capacitor?

a) C=absolute permittivity*A/d

b) C=Actual permittivity*(n-1)*A/d

c) C=Actual permittivity*(n)*A/d

d) Actual permittivity*(n+1)*A/d

### View Answer

2. What happens to the capacitance of a multi plate capacitor when the area of cross section of the plate decreases?

a) Increases

b) Decreases

c) Remains constant

d) Becomes zero

### View Answer

3. What happens to the capacitance of a multi plate capacitor when the distance of separation between the plate increases?

a) Increases

b) Decreases

c) Remains constant

d) Becomes zero

### View Answer

4. What happens to the capacitance of a multi plate capacitor when the number of plates increases?

a) Increases

b) Decreases

c) Remains constant

d) Becomes zero

### View Answer

5. Find the capacitance of a multi plate capacitor whose actual permittivity= 5F/m, n=3, A=4m^{2}and d=2m.

a) 10F

b) 20F

c) 30F

d) 40F

### View Answer

6. Find the capacitance of a multi plate capacitor whose relative permittivity=5, n=3, A=4m^{2} and d=2m.

a) 1.77*10^{-10} F

b) 1.77*10^{10} F

c) 1.77*10^{-11} F

d) 1.77*10^{11} F

### View Answer

^{-12}*(3-1)*4/2=1.77*10

^{-10}.

7. Find the number of plates in the multi plate capacitor having C=20F absolute permittivity=5F/m, A=4m^{2} and d=2m.

a) 1

b) 2

c) 3

d) 4

### View Answer

8. Calculate the distance between the plates of the capacitor having C=20F, actual permittivity=F/m

n=3 and A=4m^{2}.

a) 1m

b) 2m

c) 3m

d) 4m

### View Answer

9. Calculate the area of cross section of the multi plate capacitor having C=20F, actual permittivity=F/m n=3 and d=2m.

a) 1m

b) 2m

c) 3m

d) 4m

### View Answer

^{2}.

10. Calculate the number of plates in the multi plate capacitor having C=1.77*10^{-10}F relative permittivity=5, A=4m^{2} and d=2m.

a) 1m

b) 2m

c) 3m

d) 4m

### View Answer

## Set 3

1. What is the relation between current and voltage in a capacitor?

a) I=1/C*integral(Vdt)

b) I=CdV/dt

c) I=1/CdV/dt

d) I=Ct

### View Answer

2. If 2V is supplied to a 3F capacitor, calculate the chance stored in the capacitor.

a) 1.5C

b) 6C

c) 2C

d) 3C

### View Answer

3. Calculate the current in the capacitor having 2V supply voltage and 3F capacitance in 2seconds.

a) 2A

b) 5A

c) 6A

d) 3A

### View Answer

4. A 4microF capacitor is charged to 120V, the charge in the capacitor would be?

a) 480C

b) 480microC

c) 30C

d) 30microC

### View Answer

5. For high frequencies, capacitor acts as _________

a) Open circuit

b) Short circuit

c) Amplifier

d) Rectifier

### View Answer

6. For very low frequencies, capacitor acts as ________

a) Open circuit

b) Short circuit

c) Amplifier

d) Rectifier

### View Answer

7. A capacitor consists of_________

a) Two conductors

b) Two semiconductors

c) Two dielectrics

d) Two insulators

### View Answer

8. Capacitor preferred when there is high frequency in the circuits is __________

a) Electrolyte capacitor

b) Mica capacitor

c) Air capacitor

d) Glass capacitor

### View Answer

9. Capacitance increases with ________

a) Increase in plate area

b) Decrease in plate area

c) Increase in distance between the plates

d) Increase in density of the material

### View Answer

10. Capacitance decreases with __________

a) Increase in distance between the plates

b) Decrease in plate area

c) Decrease in distance between the plates

d) Increase in density of the material

### View Answer

## Set 4

1. What is the total capacitance when three capacitors, C1, C2 and C3 are connected in parallel?

a) C1/(C2+C3)

b) C1+C2+C3

c) C2/(C1+C3)

d) 1/C1+1/C2+1/C3

### View Answer

2. Calculate the total capacitance.

a) 10F

b) 15F

c) 13F

d) 20F

### View Answer

3. Calculate the voltage across AB if the total change stored in the combination is 13C.

a) 1V

b) 2V

c) 3V

d) 4V

### View Answer

4. Calculate the charge in the 2F capacitor.

a) 200C

b) 100C

c) 300C

d) 400C

### View Answer

5. Calculate the charge in the 1F capacitor.

a) 200C

b) 100C

c) 300C

d) 400C

### View Answer

6. Calculate the total charge of the system.

a) 200C

b) 100C

c) 300C

d) 400C

### View Answer

7. When capacitors are connected in parallel, the total capacitance is always __________ the individual capacitance values.

a) Greater than

b) Less than

c) Equal to

d) Cannot be determined

### View Answer

8. When capacitors are connected in parallel, what happens to the effective plate area?

a) Increases

b) Decreases

c) Remains the same

d) Becomes zero

### View Answer

9. Three capacitors having capacitance equal to 2F, 4F and 6F are connected in parallel. Calculate the effective parallel.

a) 10F

b) 11F

c) 12F

d) 13F

### View Answer

10. Two capacitors having capacitance value 4F, three capacitors having capacitance value 2F and 5 capacitors having capacitance value 1F are connected in parallel, calculate the equivalent capacitance.

a) 20F

b) 19F

c) 18F

d) 17F

### View Answer

## Set 5

1. What is the total capacitance when two capacitors C1 and C2 are connected in series?

a) (C1+C2)/C1C2

b) 1/C1+1/C2

c) C1C2/(C1+C2)

d) C1+C2

### View Answer

2. N capacitors having capacitance C are connected in series, calculate the equivalent capacitance.

a) C/N

b) C

c) CN

d) N/C

### View Answer

3. When capacitors are connected in series, the equivalent capacitance is ___________ each individual capacitance.

a) Greater than

b) Less then

c) Equal to

d) Insufficient data provided

### View Answer

4. What is the equivalent capacitance?

a) 1.5F

b) 0.667F

c) 2.45F

d) 2.75F

### View Answer

5. When capacitors are connected in series ___________ remains the same.

a) Voltage across each capacitor

b) Charge

c) Capacitance

d) Resistance

### View Answer

6. When capacitors are connected in series _______________ Varies

a) Voltage across each capacitor

b) Charge

c) Capacitance

d) Resistance

### View Answer

7. Four 10F capacitors are connected in series, calculate the equivalent capacitance.

a) 0.2F

b) 0.4F

c) 0.5F

d) 0.6F

### View Answer

8. Calculate the charge in the circuit.

a) 66.67C

b) 20.34C

c) 25.45C

d) 30/45C

### View Answer

9. Calculate the voltage across the 1F capacitor.

a) 33.33V

b) 66.67V

c) 56.56V

d) 23.43V

### View Answer

10. Calculate the voltage across the 2F capacitor.

a) 33.33V

b) 66.67V

c) 56.56V

d) 23.43V