SAEED MDCAT
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In an A.C generator, increase in number of turns in the coil
Which of the following is the unit of mutual inductance?
Voltage in secondary winding is _________ to current in secondary coil
For a 1 efficient step down transformer
Noninductive resistances are used in
Which one of the following is not present in AC generator
Motional emf can be produced with
Lamination of the transformer core is made of
The voltage turn ratio of stepdown transformer is
Power transfer from primary to secondary is through flux linkage, so the primary and secondary coils should be wound in such a way that flux coupling between them is
Magnetic flux is _____ product
A transformer steps down from 200V to 50 V. It has secondary winding = 40 turns, then windings in primary coil are
If an A.C voltage rms value of 10 volt is applied as input of half wave rectifier, then the rms voltage value of D.C output will be
According to Faraday law EMF stands for
Time varying magnetic field creates electric field, this is called
The secondary turns of which of the following transformers is always kept closed for ______ transformer
The magnetic flux (∅) linked with a coil is related to the number of turns (N) of the coil as:
A 100turn coil of area 0.1 m^2 rotates at half a revolution per second. It is placed in a uniform magnetic field of 0.01 T perpendicular to the axis of rotation of the coil. Calculate the maximum voltage generated in the coil?
Calculate the mutual inductance between two coils if a current 10 A in the primary coil changes the flux by 500 Wb per turn in the secondary coil of 200 turns.
The turns ratio of transformer is 10, It means that;
If magnetic field is doubled then magnetic energy density becomes
The mutual induction happens in
Alternating Current Generators use:
Faraday law states that the rate of change of magnetic flux is equal to
Faraday's law explains how electric field will interact with:
Face of coil having clockwise current:
The root mean square value of the alternating current is equal to
For a coil selfinductance L and current I then flux passing through it is
Lenz law is in accordance with conservation of
Identify the factor on which mutual inductance does not depend.
Energy stored in an inductor is
A sinusoidal current has rms value of 10A What is the peak value of current?
A device that consumes electrical energy in the external circuit of generator is known as
The maximum instantaneous value measured from zero value is known as?
A real transformer does not change
The coupling coefficient of perfectly coupled coil is
If the peaktopeak voltage is 10V, calculate the peak voltage.
Calculate the frequency if the number of revolutions is 300 and the paired poles are 50.
According to Faraday law induced voltage is produced by change in
Principle of electric generator is based on
In step down transformer _____ is decreased in secondary coils
X’ is a rectangular coil consisting of a large number of turns of copper wire wound over a soft iron core in an a.c. generator. Identify X:
Pos.  Name  Entered on  Points  Result 

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