000BE10103121805

i) Self-inductance of coil A when coil B is open circuited
ii) Emf induced in coil B when flux changes to zero in 0.01s, and
iii) Mutual inductance.

Determine the power delivered to the 10Q and 5Q resistors in the given circuit.

104) 7 20
wv) He AM ।
= —}—

| ५३ | 2 S10

A magnetic core in the form of a closed ring has a mean length of 20 cm and
cross sectional area of 1 cm’. The relative permeability of iron is 2400. What
direct current will be needed in a coil of 2000 turns uniformly wound around the
ring to create a flux of 0.2 mWb in the iron? If an air gap of Imm is cut through
the core perpendicular to the direction of this flux what current will now be
needed to maintain the same flux in the air gap? What fraction of the ampere
turns is required to maintain the flux in the air gap?

Write the mesh equations and find the mesh currents for the circuit shown

below. Also find power delivered by the sources.

~ ` 0 ர்‌
80 (+)

↼ 3082
A
‏سے‎ 202 ಇ
80% (+ 7 |
Sone 30൨ (ಅ.
5
ಜೂ
202

A current of 5 A flows through a non inductive resistance in series with a choke
coil when supplied at 250 V, 50 Hz. If the voltage across the resistance is 125 V
and that across the coil is 200V, calculate (a) impedance, reactance and
resistance of the coil, (b) the power absorbed by the coil, and (c) the total
power. Also draw the phasor diagram of voltage.

Determine the RMS and average values of the current waveform shown below.

€ ॐ ರ್ಸ್‌
ಕ ಸ್‌ മ
^ ജമ റ

(10)

(10)

(10)

(10)

(10)