If a current carrying coil is mounted on a metal frame, the back e.m.f. induced in the coil causes
inductance
eddy currents
elecro-magnetism
dipole moment
Correct answer is B
No explanation has been provided for this answer.
To convert an alternating current dynamo into a direct current dynamo, the
number of turns in the coil is increased
strength of the field magnet is increased
slip rings are replaced with a split ring commutator
coil is wound on a soft iron armature
Correct answer is C
No explanation has been provided for this answer.
An equipment whose power is 1500W and resistance is 375 ohms would draw a current of
0.10A
2.00A
4.00A
77.5A
Correct answer is B
P = I2R \(\Rightarrow\) I = \(\sqrt\frac{P}{R}\)
I = \(\sqrt\frac{1500}{375}\)
= 2A
Which of the following obeys Ohm's Law?
Glass
Diode
All electrolytes
All metals
Correct answer is D
No explanation has been provided for this answer.
899.70\(\Omega\)
10.00\(\Omega\)
0.10\(\Omega\)
0.01\(\Omega\)
Correct answer is C
No explanation has been provided for this answer.