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Electromagnetic Induction Electromagnetic Waves
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The voltage of domestic AC is 200
V. What does this represent
peak voltage
Root mean voltage
Root mean square voltage
Mean voltage
A coil is rotated in a uniform magnetic field about an axis perpendicular to thefield.
The emf induced in the coil would be maximum when the plane of coil is
NONE OF THESE
parallel to field
perpendicular to field
at 450C to field
When the current changes from +2 A to -2A in 0.05 s, an emf of 8V is induced in acoil.
The coefficient of self-induction of the coil is
0.8 H
0.1 H
0.4 H
0.2 H
A closed circuit consists of a source of emf E and an inductor coil of inductance L, connected inseries.
The active resistance of whole circuit is R. At the moment t = 0, inductance of coil abruptly decreased to L/n. Then current in the circuit immediately after, is
nE/R
E/nR
Zero
E/R
Iron core chokes are used for reducing low frequency ac because
Iron core has low permeability
With iron core self infuctance decreases
With iron core self inductance increases
iron core is good.
In step-up transformer the turn ratio is 1:2. A leclanche cell
(emf = 1.5V) is connected across the primary, the voltage developed in the secondary would be
1.5 V
3.0 V
0.75 V
Zero
What is the mutual inductance of coil and solenoid if a solenoid of length 0.50 m and with 5000 turns of wire has a radius 4 cm and a coil of 700 turns is wound on the middle part of the solenoid
36.73 mH
48.98 mH
44.17 mH
34.34 mH
The induced
e. m. f. in a coil rotating in a uniform magnetic field depends upon
Area of coil and speed of rotation
All of the above
only on total number of turns in the coil.
Only on magnetic field
A 50 mH coil carries a current of 2 A, the energy stored in joule is
0.5
0.05
0.1
1
In the case of dc motor, if the current flowing through the armature coil minimum induced emf is
one half of maximum
one fourth of maximum
Zero
maximum
In a transformer, number of turns in the primary are 140 and that in the secondary are280.
If current in primary is 4A, then that in the secondary is
10 Å
2 A
6 A
4 A
Two coils are placed close to eachother.
The mutual inductance of the pair of coils depends upon
the materials of the wires of the coils
the rates at which current are changing in the two coils
relative position and orientation of the two coils
the currents in the two coils
A resistor and an inductor are connected in series to a 220 V
A.C.supply.
When measured with an
A.C. voltmeter, the P.D. across resistor is 140
V. The P.D. across the terminals of the inductor will be nearly
150 V
170 V
180 V
160 V
For maximum output power in
D.C. motor, the induced back emf
(E) should be
one third of applied voltage
applied voltage
half of applied voltage
double of applied voltage
Air cored chokes are used for reducing high frequency ac because
air is free
with air core self inductance increases
air core has high permeability
with air core self inductance is not much
A generator produces 22 KW of power at 100 A at 220
V. The length of transmission line is 100 Kilometre whose resistance is 1ohm.
The line loss will be
20 kW
5 KW
15 kW
10 Kw
Self-inductance is measured in
amperes
volt
henry
ohms
A cylindrical magnet is kept along the axis of a circularcoil.
In rotating the magnet about its axis, the coil will have induced in it
both e. m. f. and current
no current
Current
only an e. m. f.
Self-induction opposes the growth of current in a circuit when the current is
steady
switched off
switched on
fluctuating
A 50 Hz AC current of crest value 1 A flows through the primary of atransformer.
If the mutual inductance between the primary and secondary be 0.5 H, the crest voltage induced in the secondary is
100 V
150 V
NONE OF THESE
75 V
1
2
3
5
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