 Home » Electrical Engineering » Electrical Engineering MCQ » Magnetism and Electromagnetism ### 1.Tesla is a unit of

• AField strengthm
• BInductance
• CFlux density
• DFlux

Flux density

Explanation:

Tesla is a unit of Flux density.

### 2.A permeable substance is one

• AWhich is a good conductor
• BWhich is a bad conductor
• CWhich is a strong magnet
• DThrough which the magnetic lines of force can pass very easily

Through which the magnetic lines of force can pass very easily

Explanation:

A permeable substance is one Through which the magnetic lines of force can pass very easily.

### 3.The materials having low retentivity are suitable for making

• AWeak magnet
• BTemporary magnet
• CPermanent magnet
• DNone of the above

Temporary magnet

Explanation:

The materials having low retentivity are suitable for making Temporary magnet.

### 4.A magnetic field exits around

• AIron
• BCopper
• CAluminium
• DMoving charge

Moving charge

Explanation:

• ACobalt
• BNickel
• CCopper
• DIron

Copper

Explanation:

### 6.Aluminium and platinum are ???. Materials

• AFerromagnetic
• BDiamagnetic
• CParamagnetic
• DNone of the above

Paramagnetic

Explanation:

### 7.Ferrites are ________ materials.

• AParamagnetic
• BDiamagnetic
• CFerromagnetic
• DNone of the above

Ferromagnetic

Explanation:

• ALittle
• BLower
• CHigher
• DZero

Lower

Explanation:

### 9.The direction of magnetic lines of force is

• AFrom south pole to north pole
• BFrom north pole to south pole
• CFrom one end of the magnet to another end
• DNone of the above

From north pole to south pole

Explanation:

The direction of magnetic lines of force is From north pole to south pole.

### 10.Which of the following is the vector quantity?

• ARelative permeability
• BMagnetic field intensity
• CFlux density
• DMagnetic potential

Magnetic field intensity

Explanation:

### 11.The two conductors of a transmission line carry equal current in opposite directions. The force on each conductor is

• Aproportional to I
• Bproportional to the square of currentproportional to distance between the conductors
• Cinversely proportional to the square of current
• Dproportional to the square of current

proportional to the square of current

Explanation:

The two conductors of a transmission line carry equal current in opposite directions. The force on each conductor is proportional to the square of current.

### 12. A material which is slightly repelled by a magnetic field is known as

• AFerromagnetic material
• BDiamagnetic material
• CParamagnetic material
• DConducting material

Diamagnetic material

Explanation:

A material which is slightly repelled by a magnetic field is known as Diamagnetic material.

### 13.When an iron piece is placed in a magnetic field

• AThe magnetic lines of force will bend away from their usual paths in order to go away from the piece
• BThe magnetic lines of force will bend away from their usual paths in order to go away in order to pass through the piece
• CThe magnetic lines of force will not be affected
• DThe iron piece will break

The magnetic lines of force will bend away from their usual paths in order to go away in order to pass through the piece

Explanation:

### 14.Fleming?s left hand rule is used to find

• ADirection of magnetic field due to current carrying conductor
• BDirection of flux in a solenoid
• CDirection of force on a current carrying conductor in a magnetic field
• DPolarity of magnetic pole

Direction of force on a current carrying conductor in a magnetic field

Explanation:

### 15.The ratio of intensity of magnetisation to the magnetisation force is known as

• AFlux density
• BSusceptibility
• CRelative permeability
• DNone of the above

Susceptibility

Explanation:

The ratio of intensity of magnetisation to the magnetisation force is known as Susceptibility.

### 16.Magnetising steel is normal difficult because

• AIt corrodes easily
• BIt corrodes easily
• CIt has low permeability
• DIt has high specific gravity

It has low permeability

Explanation:

### 17.The left hand rule correlates to

• ACurrent, induced e.m.f and direction of force on a conductor
• BMagnetic field, electric field and direction of force on a conductor
• CSelf-induction, mutual induction and direction of force on a conductor
• DCurrent, magnetic field and direction of force on a conductor

Current, magnetic field and direction of force on a conductor

Explanation:

### 18.The unit of relative permeability is

• AHennery/meter
• BHennery
• CIt is dimensionless
• DHennery/sq.m

It is dimensionless

Explanation:

### 19.The force between two long parallel conductors is inversely proportional to

• BCurrent in one conductor
• CProduct of current in two conductor
• DDistance between the conductors

Distance between the conductors

Explanation:

The force between two long parallel conductors is inversely proportional to Distance between the conductors.

### 20.Material subjected to rapid reversal of magnetism should have

• ALarge area of B-H loop
• BHigh permeability and low hysteresis loss
• CHigh co-ercivity and high retentivity
• DHigh co-ercivity and low density