1 |
When a current carrying conductor is placed in magnetic field at right angle to it. The direction of force acting upon it is: |
The same as direction of field
Opposite the direction of field
Makes an angle of 45<sup>o</sup>with the current
At right angle to both the field and the current.
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2 |
The shape of magnetic lines of force in case of a straight current carrying conductor is: |
Eliptical
Trangular
Rectangular
Circular
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3 |
If the change of current in a circuit induces a current in another circuit, this phenomena is known as: |
Self induction
Mutual induction
Electromagnetic induction
None mutual induction
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4 |
In A.C. generator flux will be zero if coil is to the field. |
90<sup>o</sup>
45<sup>o</sup>
Parallel
Inclined
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5 |
Transformer which increase voltage is called. |
Step-up transformer
Step down transformer
D.C.Moter
A.C.genrator
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6 |
The voltage is decreased by: |
Step-up transformer
Step-down transformer
A.C. generator
D.C. Motor
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7 |
Which device has two coils, primary and secondary? |
D.C. Motor
Transformer
A.C. genrator
a and b
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8 |
Which type of energy is converted into mechanical energy in the D.C. Motor. |
Magnetic energy
Heat energy
Electrical energy
Chemical energy
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9 |
When did Michael Faraday discover Electromagnetic induction? |
1841
1831
1821
1811
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10 |
Who discovered Electromagnetic induction? |
Michael Faraday
Flemiing
Ohm
Coulomb
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11 |
In D.C.motor split rings are made of: |
Steel
Carbon
Copper
Iron
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12 |
The force on a current carrying conductor is maximum if angle between field and conductor is: |
0<sup>o</sup>
90<sup>o</sup>
180<sup>o</sup>
45<sup>o</sup>
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