EE AND ECE IMPORTANT MCQ-ELECTRICITY AND MAGNETISM FUNDAMENTALS (PAT ONE)



l.     Who discovered the relationship between magnetism and electricity that serves as the foundation for the theory of electromagnetism?
A.   Luigi Galvani
B.   Hans Christian Oersted
C.   Andre Ampere
D.   Charles Coulomb

2.  Who  demonstrated the theory of electromagnetic  induction in  l83l?

A.   Michael Faraday

B.   Andre Ampere
C.   James Clerk Maxwell
D.   Charles Coulomb

3.  Who developed the electromagnetic theory of light  in  l862?
A.   Heinrich Rudolf Hertz
B.   Wilhelm Rontgen
C.   James Clerk Maxwell 
D.   Andre Ampere

4.      Who   discovered  that   a  current-carrying  conductor  would   move   when  placed   in    a
magnetic field?

A.   Michael Faraday

B.   Andre Ampere
C.   Hans Christian Oersted
D.   Gustav Robert Kirchhoff

5.      Who discovered the most important electrical effects which is the magnetic  effect?

A.   Hans Christian Oersted

B.   Sir Charles Wheatstone
C.   Georg Ohm
D.   James Clerk Maxwell


 6. Who demonstrated that there are magnetic effects around every  current-carrying  conductor and that current-carrying conductors can attract and repel each other just like magnets?
A.   Luigi Galvani
B.   Hans Christian Oersted
C.   Charles Coulomb
D.   Andre Ampere

7.      Who discovered superconductivity in  1911?

A.   Kamerlingh Onnes

B.   Alex Muller
C.   Geory Bednorz
D.   Charles Coulomb

8.The magnitude of the induced emf in a coil is directly proportional to the rate of change  of flux linkages. This is known as
A.   Joule’s Law

B.   Faraday’s second law of electromagnetic induction

C.   Faraday’s first law of electromagnetic  induction
D.   Coulomb’s Law

9.  Whenever a flux inking a coil or current changes, an emf is induced in it. This is known    as
A.   Joule’s Law
B.   Coulomb’s Law

C.   Faraday’s first law of electromagnetic induction

D.   Faraday’s second law of electromagnetic induction

10. The force of attraction or repulsion between two magnetic poles  is  directly proportional  to their strengths.
A.   Newton’s first law
B.   Faraday’s first law of electromagnetic  induction

C.   Coulomb’s first law

D.   Coulomb’s second law


 ll. The force of attraction or repulsion between two magnetic poles is inversely proportional  to the square of the distance between them. This is known  as
A.   Newton’s first law
B.   Faraday’s first law of electromagnetic  induction
C.   Coulomb’s first law

D.   Coulomb’s second law

l2. Whenever a conductor cuts magnetic flux, an emf is induced in it. This is   known as
A.   Coulomb’s law
B.   Joule’s law

C.   Faraday’s law

D.   Ohm’s law

l3. A law that states that the polarity of the induced voltage will oppose the change  in magnetic flux causing the induction.
A.   Joule’s law
B.   Faraday’s law
C.   Coulomb’s law

D.   Lenz’ law

 l4. A law that states that the current  in a thermionic diode varies directly with the three-  halves power of anode voltage and inversely with the square of the distance between the electrodes, provided operating conditions are such that the current is limited only by the space charge.
A.   Hall’s law
B.   Joule’s law

C.   Child’s law

D.   Coulomb’s law

l5. States   that   the   ratio   of   the   thermal   conductivity   is   proportional   to   the absolute temperature for all metals.
A.   Wien’s displacement law
B.   Hartleys law
C.   Hall’s law
D.   Wiedemann Franz law


 l6. A law establishing the fact that the algebraic su of the rises and drops of the mmf around    a  closed loop of a magnetic circuit is equal to  zero.
A.   Kirchhoff’s circuital law
B.   Maxwell’s circuital law

C.   Ampere’s circuital law

D.   Coulomb’s circuital law

l7. The net electrical charge in an isolated system remains constant. This is known   as

A.   Law of conservation of charge

B.   Coulomb’s first law
C.   Coulomb’s second law

D.   Law of conservation of energy

l8. Lenz’s law is the consequence of the law of conservation   of

A.   Energy

B.   Charge

C.   Field lines

D.   Momentum


19. Lenz’ law states that the direction of the induced emf and hence   current
A.   Is determined by the rate of current flux
B.   Is found by the right hand rule
C.   Is found by the left hand rule

D.   Always opposes the cause producing it

20.  If you hold the conductor with right hand so that the stretched thumb points  in  the direction of the current, then encircling fingers will give the direction of magnetic lines of force round the conductor. This is known as
A.   Left hand cork screw rule
B.   Right hand cork screw rule
C.   Left hand rule

D.   Right hand rule


 2l. If the right handed bottle-opener cork screw is assumed to be along the conductor so as to advance in the direction of current flow, the motion of its handle will indicate  the  direction of magnetic flux produced around the conductor. This is known  as
A.    Right hand rule
B.     Left hand rule
C.     Cork screw rule
D.    End rule

22.  If on looking at any one end of a solenoid; the direction of current flow is found to be clockwise then the end under observation is a south pole. This is known  as
A.   Right hand rule
B.   Left hand rule
C.   Cork screw rule

D.   End Rule

23.  If the solenoid is gripped by the right hand with the fingers pointing the direction of current flow, the outstretched thumb will then point the north pole. This is known  as 
A.  Right hand rule 
B.  Helix rule 
C. End rule 
D.  Cork screw rule

24.  The process by which an emf and hence current is generated or induced in a conductor when   there   is   a   change   in   the   magnetic   flux   linking   the   conductor   is   called
A. Electromagnetic induction 
B.  Mutual induction 
C.  Faraday’s law 
D.  Electromagnetic interference

25.  The emf induced in a coil due to the change of its own flux linked with it is   called 
A.  Mutually induced emf 
B.  Dynamically induced emf 
C. Statically induced emf 
D. Self induced emf 
26.  The emf induced in a coil due to the changing  current of another  neighboring coil is   called 

         A. Mutually induced emf

B. Self induced emf

C. Statically induced emf

D. Dynamically induced emf
27.  When a conductor is stationary and the magnetic field is moving or changing the emf induced is called

A.  Statically induced emf

B.  Mutually induced emf

C. Self induced emf

D.  Dynamically induced emf

28.  The magnetic potential in a magnetic circuit can be measured in terms  of

A. Mmf

B. Emf

C. Farad

D. Coulomb

29.  A substance that attracts pieces iron

A. Conductor

B. Semiconductor

C.  Magnet

D. All of the above

30.  The phenomenon by which a subtracts pieces of  iron

A.  Magnetism

B.  Electromagnetism

C. Naturalism

D.  Materialism

31.  Which of the following is a natural magnet?

A.  Steel

B.  Magnesia

C. Lodestone

D.  Soft iron


 32.  Define as that pole which when placed in air from a similar and equal pole repels it with a force of newtons

A.  North pole

B.  South pole

C. Unit pole

D.  Magnetic pole

33.  The point in a magnet where the intensity of magnetic lines of force is maximum
A. Magnetic pole

B.  South pole

C.  North pole

D.  Unit pole

34.  The straight line passing through the two poles of magnet is   called

A.  Real axis

B.  Cartesian axis

C. Magnetic axis

D.  Imaginary axis
35.  The  branch of Engineering  which  deals  with the  magnetic  effect  of electric  current  is known as

A.  Magnetism

B.  Electromagnetism

C. Electrical engineering

D.  Electronics engineering

36.  The space outside the magnet where its pole have a force of attraction or repulsion on a magnetic pole is called

A. Magnetic field

B.  Electric field

C.  Electromagnetic field

D.  Free Space Field

37.  The total number of magnetic lines of force in a magnetic field is called 
A. Magnetic flux

B.  Magnetic flux density

C.  Magnetic flux intensity

D.  Magnetic potential



 38.  The phenomenon by which a magnetic substance becomes a magnet when it is place near  a magnet

A.  Magnetic effect

B.  Magnetic phenomenon

C. Magnetic induction

D.  Electromagnetic induction

39.  Which of the following magnetic materials can be easily magnetized in both direction? 
A. Soft magnetic materials

B.  Hard magnetic materials

C.  High hysteresis loss materials

D.  Low hysteresis loss materials
40.  Which of the following materials has permeability slightly less than that of free  space?

A.  Paramagnetic

B.  Non- magnetic

C. Ferromagnetic 
D. Diamagnetic

4l. Materials whose permeabilities are slightly greater than that of free space 
A. Paramagnetic

B.  Non- magnetic

C.  Ferromagnetic

D.  Diamagnetic

42.  Materials that  have very high permeabilities (hundreds and even thousands times of that of free space)

A.  Paramagnetic

B.  Non- magnetic

C.  Ferromagnetic

D.  Diamagnetic

43.  The current of electric circuit is analogous to which quantity of a magnetic  circuit

A.  Mmf

B.  Flux

C.  Flux density

D.  Reluctivity



 44.  What is the diameter of an atom?
A. About 10^-10 m

B.  About l0^-l0 cm

C.  About l0^-l0 mm

D.  About l0^-l0 µm

45.  Defined as a closed path in which magnetic induction or flux  flows

A.  Electric circuit

B.  Magnetic circuit

C.  Electronic circuit

D.  Electromagnetic circuit
46.  The force which set ups or tends to set up magnetic flux in a magnetic  circuit

A.  Dynamic force

B.  Electromotive force

C.  Potential   difference
D. Magnetomotive force

47.  Referred to as the specific reluctance of a material

A.  Resistivity

B.  Reluctivity

C.  Conductivity

D.  Permeability

48.  The property of a material which opposes the creation of magnetic flux in  it

A.  Resistance

B.  Reluctance

C.  Permeance

D.  Conductance
49.  It is the reciprocal of reluctance and implies the case of readiness with which magnetic  flux is developed.

A.  Resistance

B.  Conductance
C. Permeance

D. Inductance


 50.  The ability of a material to conduct magnetic flux through it.

A.  Permittivity

B.  Reluctivity

C.  Conductivity
D. Permeability

      5l. The ratio of the permeability of material to the permiabiity of air or vacuum.

A.  Relative permeability

B.  Relative permittivity

C. Relative conductivity

D.  Relative reluctivity

52.  Permeance is analogous to
A. Conductance

B.  Reluctance

C.  Admittance

D.  Resistance

53.  The property of magnetic materials of retaining magnetism after withdrawal of the magnetizing force is known as

A.  Retentivity

B.  Reluctivity

C.  Resistivity

D.  Conductivity

54.  The quantity of magnetism retained by a magnetic material after withdrawal of the magnetizing force is called

A.  Leftover magnetism

B.  Hysteresis

C.  Residual magnetism

D.  Coercivity

55. The  amount  of magnetizing  force  to counter balance  the residual magnetism of a magnetic material is referred to as

A.  Reluctivity

B.  Susceptivity

C.  Coercivity

D.  Retentivity
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