50 + Mcqs in Electrical Engineering Page 1 McqOptions

1.	Which of the following is not an inorganic functional material?
A.	Ferroelectric
B.	Reverse micelles
C.	Magnetic field sensor
D.	Light detectors
Answer» C. Magnetic field sensor

Discussion

2.	What is relative permittivity?
A.	Equal to the absolute permittivity
B.	Ratio of actual permittivity to absolute permittivity
C.	Ratio of absolute permittivity to actual permittivity
D.	Equal to the actual permittivity
Answer» C. Ratio of absolute permittivity to actual permittivity

Discussion

3.	In order to obtain a high value for capacitance, the permittivity of the dielectric medium should be?
A.	Low
B.	High
C.	Zero
D.	Unity
Answer» C. Zero

Discussion

4.	The insulant between the two plates of a capacitor is called _______
A.	Conductor
B.	Semi-conductor
C.	Dielectric
D.	Superconductor
Answer» D. Superconductor

Discussion

5.	What happens when one material is rubbed against another?
A.	The material becomes electrically neutral
B.	The material becomes electrically charged
C.	The material becomes negatively charged
D.	The material becomes positively charged
Answer» C. The material becomes negatively charged

Discussion

6.	Which, among the following is the correct expression for an electric field?
A.	E=F/C
B.	E=F*C
C.	E=F/Q
D.	E=F*Q
Answer» D. E=F*Q

Discussion

7.	In uniform fields, all points have ________ field strength.
A.	Zero
B.	Same
C.	Infinity
D.	Different
Answer» C. Infinity

Discussion

8.	A field that spreads outwards in all directions is __________
A.	Linear
B.	Radial
C.	Weak
D.	Strong
Answer» C. Weak

Discussion

9.	Which, among the following, is the field where electric charge experiences a force?
A.	Electric field
B.	Magnetic field
C.	Gravitational field
D.	Electric, magnetic or gravitational field
Answer» B. Magnetic field

Discussion

10.	Which among the following statements is true with regard to electric field lines?
A.	Electric field lines always intersect
B.	Electric field lines may or may not intersect
C.	Electric field lines can be seen
D.	Electric field lines never intersect
Answer» E.

Discussion

11.	Electric field terminates at ________
A.	Positive charge
B.	Negative charge
C.	Neither positive nor negative
D.	Both positive and negative
Answer» C. Neither positive nor negative

Discussion

12.	Electric field originates at __________
A.	Positive charge
B.	Negative charge
C.	Neither positive nor negative
D.	Both positive and negative
Answer» B. Negative charge

Discussion

13.	The conventional direction of electric field is ________
A.	Positive to negative
B.	Negative to positive
C.	No specific direction
D.	Direction cannot be determined
Answer» B. Negative to positive

Discussion

14.	Unit of capacitance is __________
A.	Volts
B.	Farad
C.	Henry
D.	Newton
Answer» C. Henry

Discussion

15.	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
Answer» C. 6F

Discussion

16.	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
Answer» D. Increase in density of the material

Discussion

17.	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
Answer» B. Decrease in plate area

Discussion

18.	Capacitor preferred when there is a high frequency in the circuits is ______
A.	Electrolyte capacitor
B.	Mica capacitor
C.	Air capacitor
D.	Glass capacitor
Answer» C. Air capacitor

Discussion

19.	A capacitor consists of___________
A.	Two conductors
B.	Two semiconductors
C.	Two dielectrics
D.	Two insulators
Answer» B. Two semiconductors

Discussion

20.	For very low frequencies, capacitor acts as _______
A.	Open circuit
B.	Short circuit
C.	Amplifier
D.	Rectifier
Answer» B. Short circuit

Discussion

21.	For high frequencies, capacitor acts as _______
A.	Open circuit
B.	Short circuit
C.	Amplifier
D.	Rectifier
Answer» C. Amplifier

Discussion

22.	Capacitance is directly proportional to__________
A.	Area of cross section between the plates
B.	Distance of separation between the plates
C.	Both area and distance
D.	Neither area nor distance
Answer» B. Distance of separation between the plates

Discussion

23.	Which among the following equations is incorrect?
A.	Q=CV
B.	Q=C/V
C.	V=Q/C
D.	C=Q/V
Answer» C. V=Q/C

Discussion

24.	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
Answer» C. It will start discharging

Discussion

25.	Unit of capacitance is___________
A.	Volts
B.	Farad
C.	Henry
D.	Newton
Answer» C. Henry

Discussion

26.	What is the value of capacitance of a capacitor which has a voltage of 4V and ha 8C of charge?
A.	2F
B.	4F
C.	6F
D.	8F
Answer» B. 4F

Discussion

27.	Air has a dielectric constant of ___________
A.	Unity
B.	Zero
C.	Infinity
D.	Hundread
Answer» B. Zero

Discussion

28.	Capacitors charge and discharge in __________ manner.
A.	Linear
B.	Constant
C.	Square
D.	Exponential
Answer» E.

Discussion

29.	Calculate the time constant of a series RC circuit consisting of a 100microF capacitor in series with a 100ohm resistor.
A.	0.1 sec
B.	0.1 msec
C.	0.01 sec
D.	0.01 msec
Answer» D. 0.01 msec

Discussion

30.	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
Answer» C. Remains the same

Discussion

31.	A power factor of a circuit can be improved by placing which, among the following, in a circuit?
A.	Inductor
B.	Capacitor
C.	Resistor
D.	Switch
Answer» C. Resistor

Discussion

32.	What happens to the capacitance when the voltage across the capacitor increases?
A.	Decreases
B.	Increases
C.	Becomes 0
D.	No effect
Answer» B. Increases

Discussion

33.	Calculate the capacitance of a capacitor that stores 40microC of charge and has a voltage of 2V.
A.	20F
B.	20microF
C.	10F
D.	10microF
Answer» C. 10F

Discussion

34.	What happens to the current flow in a fully charged capacitor?
A.	Current flow stops
B.	Current flow doubles
C.	Current flow becomes half its original value
D.	Current flow becomes one-fourth its original value
Answer» B. Current flow doubles

Discussion

35.	When will capacitor fully charged?
A.	When the voltage across its plates is half the voltage from ground to one of its plates
B.	When current through the capacitor is a 1/root2 time its value
C.	When the supply voltage is equal to the capacitor voltage
D.	Never
Answer» D. Never

Discussion

36.	When the voltage across a capacitor increases, what happens to the charge stored in it?
A.	Increases
B.	Decreases
C.	Becomes zero
D.	Cannot be determined
Answer» B. Decreases

Discussion

37.	If one plate of a parallel plate capacitor is charged to positive charge the other plate is charged to?
A.	Positive
B.	Negative
C.	Positive or negative
D.	Not charged
Answer» C. Positive or negative

Discussion

38.	What is the voltage across a capacitor at the time of switching, that is, when t=0?
A.	Infinity
B.	Infinity
C.	Cannot be determined
D.	1V
Answer» C. Cannot be determined

Discussion

39.	If a 2F capacitor has 1C charge, calculate the voltage across its terminals.
A.	0.5V
B.	2V
C.	1.5V
D.	1V
Answer» C. 1.5V

Discussion

40.	Which among the following expressions relate charge, voltage and capacitance of a capacitor?
A.	Q=C/V
B.	Q=V/C
C.	Q=CV
D.	C=Q2V
Answer» D. C=Q2V

Discussion

41.	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
Answer» D. Increase in density of the material

Discussion

42.	Capacitance increases with ________
A.	Increase in plate area
B.	Decrease in plate area
C.	Increase in distance between the plates
D.	Increase in distance between the plates
Answer» B. Decrease in plate area

Discussion

43.	Capacitor preferred when there is high frequency in the circuits is __________
A.	Electrolyte capacitor
B.	Mica capacitor
C.	Air capacitor
D.	Glass capacitor
Answer» C. Air capacitor

Discussion

44.	A capacitor consists of_________
A.	Two conductors
B.	Two semiconductors
C.	Two dielectrics
D.	Two insulators
Answer» B. Two semiconductors

Discussion

45.	For very low frequencies, capacitor acts as ________
A.	Open circuit
B.	Short circuit
C.	Amplifier
D.	Rectifier
Answer» B. Short circuit

Discussion

46.	For high frequencies, capacitor acts as _________
A.	Open circuit
B.	Short circuit
C.	Amplifier
D.	Rectifier
Answer» C. Amplifier

Discussion

47.	A 4microF capacitor is charged to 120V, the charge in the capacitor would be?
A.	480C
B.	480microC
C.	30C
D.	30microC
Answer» C. 30C

Discussion

48.	Calculate the current in the capacitor having 2V supply voltage and 3F capacitance in 2seconds.
A.	2A
B.	5A
C.	6A
D.	3A
Answer» E.

Discussion

49.	If 2V is supplied to a 3F capacitor, calculate the chance stored in the capacitor.
A.	1.5C
B.	6C
C.	2C
D.	3C
Answer» C. 2C

Discussion

50.	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
Answer» C. I=1/CdV/dt

Discussion

Explore topic-wise MCQs in Graduate Aptitude Test (GATE).

Which&nbsp;of&nbsp;the&nbsp;following&nbsp;is&nbsp;not&nbsp;an&nbsp;inorganic&nbsp;functional&nbsp;material?

&nbsp;What&nbsp;is&nbsp;relative&nbsp;permittivity?

In&nbsp;order&nbsp;to&nbsp;obtain&nbsp;a&nbsp;high&nbsp;value&nbsp;for&nbsp;capacitance,&nbsp;the&nbsp;permittivity&nbsp;of&nbsp;the&nbsp;dielectric&nbsp;medium&nbsp;should&nbsp;be?

The&nbsp;insulant&nbsp;between&nbsp;the&nbsp;two&nbsp;plates&nbsp;of&nbsp;a&nbsp;capacitor&nbsp;is&nbsp;called&nbsp;_______

What&nbsp;happens&nbsp;when&nbsp;one&nbsp;material&nbsp;is&nbsp;rubbed&nbsp;against&nbsp;another?

Which,&nbsp;among&nbsp;the&nbsp;following&nbsp;is&nbsp;the&nbsp;correct&nbsp;expression&nbsp;for&nbsp;an&nbsp;electric&nbsp;field?

In&nbsp;uniform&nbsp;fields,&nbsp;all&nbsp;points&nbsp;have&nbsp;________&nbsp;field&nbsp;strength.

&nbsp;A&nbsp;field&nbsp;that&nbsp;spreads&nbsp;outwards&nbsp;in&nbsp;all&nbsp;directions&nbsp;is&nbsp;__________

Which,&nbsp;among&nbsp;the&nbsp;following,&nbsp;is&nbsp;the&nbsp;field&nbsp;where&nbsp;electric&nbsp;charge&nbsp;experiences&nbsp;a&nbsp;force?

Which&nbsp;among&nbsp;the&nbsp;following&nbsp;statements&nbsp;is&nbsp;true&nbsp;with&nbsp;regard&nbsp;to&nbsp;electric&nbsp;field&nbsp;lines?

Electric&nbsp;field&nbsp;terminates&nbsp;at&nbsp;________

&nbsp;Electric&nbsp;field&nbsp;originates&nbsp;at&nbsp;__________

&nbsp;The&nbsp;conventional&nbsp;direction&nbsp;of&nbsp;electric&nbsp;field&nbsp;is&nbsp;________

&nbsp;Unit&nbsp;of&nbsp;capacitance&nbsp;is&nbsp;__________

What&nbsp;is&nbsp;the&nbsp;value&nbsp;of&nbsp;capacitance&nbsp;of&nbsp;a&nbsp;capacitor&nbsp;which&nbsp;has&nbsp;a&nbsp;voltage&nbsp;of&nbsp;4V&nbsp;and&nbsp;ha&nbsp;16C&nbsp;of&nbsp;charge?

Capacitance&nbsp;decreases&nbsp;with&nbsp;_________

&nbsp;Capacitance&nbsp;increases&nbsp;with&nbsp;______

Capacitor&nbsp;preferred&nbsp;when&nbsp;there&nbsp;is&nbsp;a&nbsp;high&nbsp;frequency&nbsp;in&nbsp;the&nbsp;circuits&nbsp;is&nbsp;______

&nbsp;A&nbsp;capacitor&nbsp;consists&nbsp;of___________

For&nbsp;very&nbsp;low&nbsp;frequencies,&nbsp;capacitor&nbsp;acts&nbsp;as&nbsp;_______

&nbsp;For&nbsp;high&nbsp;frequencies,&nbsp;capacitor&nbsp;acts&nbsp;as&nbsp;_______

Capacitance&nbsp;is&nbsp;directly&nbsp;proportional&nbsp;to__________

Which&nbsp;among&nbsp;the&nbsp;following&nbsp;equations&nbsp;is&nbsp;incorrect?

What&nbsp;will&nbsp;happen&nbsp;to&nbsp;the&nbsp;capacitor&nbsp;when&nbsp;the&nbsp;source&nbsp;is&nbsp;removed?

Unit&nbsp;of&nbsp;capacitance&nbsp;is___________

What&nbsp;is&nbsp;the&nbsp;value&nbsp;of&nbsp;capacitance&nbsp;of&nbsp;a&nbsp;capacitor&nbsp;which&nbsp;has&nbsp;a&nbsp;voltage&nbsp;of&nbsp;4V&nbsp;and&nbsp;ha&nbsp;8C&nbsp;of&nbsp;charge?

&nbsp;Air&nbsp;has&nbsp;a&nbsp;dielectric&nbsp;constant&nbsp;of&nbsp;___________

Capacitors&nbsp;charge&nbsp;and&nbsp;discharge&nbsp;in&nbsp;__________&nbsp;manner.

Calculate&nbsp;the&nbsp;time&nbsp;constant&nbsp;of&nbsp;a&nbsp;series&nbsp;RC&nbsp;circuit&nbsp;consisting&nbsp;of&nbsp;a&nbsp;100microF&nbsp;capacitor&nbsp;in&nbsp;series&nbsp;with&nbsp;a&nbsp;100ohm&nbsp;resistor.

When&nbsp;the&nbsp;supply&nbsp;frequency&nbsp;increases,&nbsp;what&nbsp;happens&nbsp;to&nbsp;the&nbsp;capacitive&nbsp;reactance&nbsp;in&nbsp;the&nbsp;circuit?

A&nbsp;power&nbsp;factor&nbsp;of&nbsp;a&nbsp;circuit&nbsp;can&nbsp;be&nbsp;improved&nbsp;by&nbsp;placing&nbsp;which,&nbsp;among&nbsp;the&nbsp;following,&nbsp;in&nbsp;a&nbsp;circuit?

What&nbsp;happens&nbsp;to&nbsp;the&nbsp;capacitance&nbsp;when&nbsp;the&nbsp;voltage&nbsp;across&nbsp;the&nbsp;capacitor&nbsp;increases?

Calculate&nbsp;the&nbsp;capacitance&nbsp;of&nbsp;a&nbsp;capacitor&nbsp;that&nbsp;stores&nbsp;40microC&nbsp;of&nbsp;charge&nbsp;and&nbsp;has&nbsp;a&nbsp;voltage&nbsp;of&nbsp;2V.

What&nbsp;happens&nbsp;to&nbsp;the&nbsp;current&nbsp;flow&nbsp;in&nbsp;a&nbsp;fully&nbsp;charged&nbsp;capacitor?

When&nbsp;will&nbsp;capacitor&nbsp;fully&nbsp;charged?

&nbsp;When&nbsp;the&nbsp;voltage&nbsp;across&nbsp;a&nbsp;capacitor&nbsp;increases,&nbsp;what&nbsp;happens&nbsp;to&nbsp;the&nbsp;charge&nbsp;stored&nbsp;in&nbsp;it?

If&nbsp;one&nbsp;plate&nbsp;of&nbsp;a&nbsp;parallel&nbsp;plate&nbsp;capacitor&nbsp;is&nbsp;charged&nbsp;to&nbsp;positive&nbsp;charge&nbsp;the&nbsp;other&nbsp;plate&nbsp;is&nbsp;charged&nbsp;to?

What&nbsp;is&nbsp;the&nbsp;voltage&nbsp;across&nbsp;a&nbsp;capacitor&nbsp;at&nbsp;the&nbsp;time&nbsp;of&nbsp;switching,&nbsp;that&nbsp;is,&nbsp;when&nbsp;t=0?

If&nbsp;a&nbsp;2F&nbsp;capacitor&nbsp;has&nbsp;1C&nbsp;charge,&nbsp;calculate&nbsp;the&nbsp;voltage&nbsp;across&nbsp;its&nbsp;terminals.

Which&nbsp;among&nbsp;the&nbsp;following&nbsp;expressions&nbsp;relate&nbsp;charge,&nbsp;voltage&nbsp;and&nbsp;capacitance&nbsp;of&nbsp;a&nbsp;capacitor?

Capacitance&nbsp;decreases&nbsp;with&nbsp;__________

Capacitance&nbsp;increases&nbsp;with&nbsp;________

Capacitor&nbsp;preferred&nbsp;when&nbsp;there&nbsp;is&nbsp;high&nbsp;frequency&nbsp;in&nbsp;the&nbsp;circuits&nbsp;is&nbsp;__________

A&nbsp;capacitor&nbsp;consists&nbsp;of_________

&nbsp;For&nbsp;very&nbsp;low&nbsp;frequencies,&nbsp;capacitor&nbsp;acts&nbsp;as&nbsp;________

For&nbsp;high&nbsp;frequencies,&nbsp;capacitor&nbsp;acts&nbsp;as&nbsp;_________

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

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

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

What&nbsp;is&nbsp;the&nbsp;relation&nbsp;between&nbsp;current&nbsp;and&nbsp;voltage&nbsp;in&nbsp;a&nbsp;capacitor?

Which of the following is not an inorganic functional material?

What is relative permittivity?

In order to obtain a high value for capacitance, the permittivity of the dielectric medium should be?

The insulant between the two plates of a capacitor is called _______

What happens when one material is rubbed against another?

Which, among the following is the correct expression for an electric field?

In uniform fields, all points have ________ field strength.

A field that spreads outwards in all directions is __________

Which, among the following, is the field where electric charge experiences a force?

Which among the following statements is true with regard to electric field lines?

Electric field terminates at ________

Electric field originates at __________

The conventional direction of electric field is ________

Unit of capacitance is __________

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

Capacitance decreases with _________

Capacitance increases with ______

Capacitor preferred when there is a high frequency in the circuits is ______

A capacitor consists of___________

For very low frequencies, capacitor acts as _______

For high frequencies, capacitor acts as _______

Capacitance is directly proportional to__________

Which among the following equations is incorrect?

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

Unit of capacitance is___________

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

Air has a dielectric constant of ___________

Capacitors charge and discharge in __________ manner.

Calculate the time constant of a series RC circuit consisting of a 100microF capacitor in series with a 100ohm resistor.

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

A power factor of a circuit can be improved by placing which, among the following, in a circuit?

What happens to the capacitance when the voltage across the capacitor increases?

Calculate the capacitance of a capacitor that stores 40microC of charge and has a voltage of 2V.

What happens to the current flow in a fully charged capacitor?

When will capacitor fully charged?

When the voltage across a capacitor increases, what happens to the charge stored in it?

If one plate of a parallel plate capacitor is charged to positive charge the other plate is charged to?

What is the voltage across a capacitor at the time of switching, that is, when t=0?

If a 2F capacitor has 1C charge, calculate the voltage across its terminals.

Which among the following expressions relate charge, voltage and capacitance of a capacitor?

Capacitance decreases with __________

Capacitance increases with ________

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

A capacitor consists of_________

For very low frequencies, capacitor acts as ________

For high frequencies, capacitor acts as _________

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

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

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

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