Hi friends, these are some of the multiple choice questions on electrical and magnetic properties. These are some of the basic questions which are asked in previous competitive papers check out and comment...
1) How is mutual inductance between two coils decreased?
A) By using a common core
B) By moving the coils closer
C) By moving the coils apart
D) By increasing the number of turns of either coil
Ans:C
2) A magnetic field is
A) The current flow through space around a permanent magnet
B) The force setup when current flows through a conductor
C) The force that drives current through a resistor
D) The force between the plates of a charged capacitor
Ans:B
3) Ohm’s law can be used only to a i circuit or component.
A) Unilateral
B) Exponential
C) Trivalent
D) Linear
Ans:D
4) When the current flows, the magnetic field ..... .. conductor is in what direction?
A) The same as the current direction
B) Opposite the current direction
C) Omnidirectional
D) In the direction determined by left hand rule
Ans:D
5) The magnetic field around the conductor is determined by the
A) Size of the conductor
B) Amount of current
C) Current divided by the resistance
D) Resistance divided by the current
Ans:B
6) Back emf refers to the
A) Current equal to the applied emf
B) Opposing emf
C) Current opposing the applied emf
D) Voltage opposing the applied emf
Ans:D
7) The magnetic flux through a coil changes. This results to the induced emf acting in a direction as to
A) Opposing the change
B) Aid the change
C) Either oppose or aid the change
D) Neither oppose nor aid the change
Ans:A
8) A magnetic flux of 2.5 X10/\4 Wb through an area of 5 X10/\4 square meters results in
A) 5 Wb
B) 0.5 Tesia of flux density
C) 5X 10^-5 Wb of flux
D) 5000 Tesia of flux density
Ans:B
9) If a 20 V potential is applied across a relay coil with 50 tums having 1 Q of resistance,
the total magneto motive producing magnetic flux in the circuit is
A) 10 Wb
B) 50 T
C) 1000 A t/m
D) 1000 A.t
Ans:D
l0) What is the reluctance of a magnetic path having a length of 2x 10“-3m and cross-sectional area of 2.5 x 10^-3 m^2?
A) 6366 A.t/Wb
B) 6000 A.t/Wb
C) 8x10^-3 A.t/Wb
D) 0.8 A.t/Wb
Ans:A
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1) How is mutual inductance between two coils decreased?
A) By using a common core
B) By moving the coils closer
C) By moving the coils apart
D) By increasing the number of turns of either coil
Ans:C
2) A magnetic field is
A) The current flow through space around a permanent magnet
B) The force setup when current flows through a conductor
C) The force that drives current through a resistor
D) The force between the plates of a charged capacitor
Ans:B
3) Ohm’s law can be used only to a i circuit or component.
A) Unilateral
B) Exponential
C) Trivalent
D) Linear
Ans:D
4) When the current flows, the magnetic field ..... .. conductor is in what direction?
A) The same as the current direction
B) Opposite the current direction
C) Omnidirectional
D) In the direction determined by left hand rule
Ans:D
5) The magnetic field around the conductor is determined by the
A) Size of the conductor
B) Amount of current
C) Current divided by the resistance
D) Resistance divided by the current
Ans:B
6) Back emf refers to the
A) Current equal to the applied emf
B) Opposing emf
C) Current opposing the applied emf
D) Voltage opposing the applied emf
Ans:D
7) The magnetic flux through a coil changes. This results to the induced emf acting in a direction as to
A) Opposing the change
B) Aid the change
C) Either oppose or aid the change
D) Neither oppose nor aid the change
Ans:A
8) A magnetic flux of 2.5 X10/\4 Wb through an area of 5 X10/\4 square meters results in
A) 5 Wb
B) 0.5 Tesia of flux density
C) 5X 10^-5 Wb of flux
D) 5000 Tesia of flux density
Ans:B
9) If a 20 V potential is applied across a relay coil with 50 tums having 1 Q of resistance,
the total magneto motive producing magnetic flux in the circuit is
A) 10 Wb
B) 50 T
C) 1000 A t/m
D) 1000 A.t
Ans:D
l0) What is the reluctance of a magnetic path having a length of 2x 10“-3m and cross-sectional area of 2.5 x 10^-3 m^2?
A) 6366 A.t/Wb
B) 6000 A.t/Wb
C) 8x10^-3 A.t/Wb
D) 0.8 A.t/Wb
Ans:A
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