Short notes
Objective questions (Answers are given below)
- According to Faraday’s Laws of Electromagnetic Induction, an e.m.f. is induced in a conductor whenever it
- (a) lies in a magnetic field
(b) cuts magnetic flux
(c) moves parallel to the direction of the
magnetic field
(d) lies perpendicular to the magnetic flux. - A pole of driving point admittance function implies
(a) zero current for a finite value of driving
voltage
(b) zero voltage for a finite value of driving
current
(c) an open circuit condition
(d) None of (a), (b) and (c) mentioned in the
question (ESE 2001) - The inductance of a long solenoid of length 1000 mm wound uniformly with 3000 turns on a cylindrical paper tube of 60 mm diameter
is
(a) 3.2 μH (b) 3.2 mH
(c) 32.0 mH (d) 3.2 H
(GATE 2004) - A moving iron ammeter produced a full scale torque of 240 μNm with a deflection of 1200 at a current of 10 A. The rate of change of
self inductance (μH/radian) of the instrument
at full scale is
(a) 2.0 μH/radian
(b) 4.8 μH/radian
(c) 12.0 μH/radian
(d) 114.6 μH/radian
(GATE 2004) - The self-inductance of a long cylindrical
conductor due to its internal flux linkages is
k H/m. If the diameter of the conductor is
doubled, then the selfinductance of the
conductor due its internal flux linkages would
be
(a) 0.5 K H/m (b) K H/m
(c) 1.414 K H/m (d) 4 K H/m
(GATE)