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EE 203 ID[AO403] .pdf


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Roll No. ......................
~,al No. of Questions: 09]

,

[Total No. of Pages: 03

-

. MAGNETIC

B.Tech. (SeDl.
3rd)
CIRCUITS &'TRANSFORMERS

.

SUB.TECT CODE: EE - 203
Paper ID : [A0403]
[Note:

Please fill subject code and paper ID on OMR]

Time : 03 Hours

Maximum Marks: 60

Instmction to Candidates:

1)
2)

Section-Ais Compulsory. .
Attempt any Four questi~ns from Section - B.

.

3)

Attemptany Two questionsfrom Section- c.

.

Section - A'

(10 x2 =20)

Q1)
State Biot-Savart's law.

a)
.

. b)

State faradays laws of electromagnetic induction.

c)

What is meant by magnetic fringing? How does it affect the magnetic
.

d)
. e)

circuit?
What is hystere~is loss? How can it be reduced?

.

Defme regulation and efficiency of a transfoImer.

t)

Give physicaf significance of leakage reactance.

g)

Why open. circuit and short circuit tests are performed on transformer?

h)

What is meant by an auto transformer?

i)

Give limitations of off load tap changing transformer.

j)

Defille all day efficiency and give its importance.

.

M-582 [1859J

.

P.T.D.

-

Section B

~.
(4 x 5 ==20)

Q2) Differentiate between the statically induced and dynamically induced emf.
What is th~ nature, of the hysteresis loop of ferrite material, and where is it
used?

Q3) The hysteresis and eddy current loss of a ferromagnetic sample at a frequency'
of 50 Hz is 25 watts and 30 watts respectively, when the flux density of 0.7.5.
tesla. Calculate the total iron loss at a frequency of 400 Hz, when the operating
flux density is 0.3 tesla.

Q4) Draw and discuss the phasor diagram of a transformer on load, when it is
taking inductive load.
.

,

Q5) Explain the parallel operation of single phase transformers.
Q6) Discuss procedure for conversion of 2 winding transformer into auto
transformer.
:0.

Section

C

-

(2 x 10

=20)

Q7) (a) Briefly discuss a test to separate the hysteresis loss and eddy current
loss from the core loss of a transformer.
(b) A 5 kVA single phase transformer has a core loss of 50 watts and full
load 'ohmic loss of 100 watts. The daily variation of load on the
transformer is as follows:
.

7 AM to 1 PM

3 kW at power factor 0.6 lagging.

1 PM to 6 PM

2 kw at power factor 0.8 lagging.

6 PM to 1 PM

5 kW at power fact<?r0.9 lagging.
No load

lAMt07AM

Determine'the all day efficiency.
M-582

2

'

,

Q~a)

Discuss the ~ature of.inrush current when a transfo~er is s~itched in to
the supply (1) when mstantaneous supply voltage IS zero (11)when the
instantaneous supply voltage is positive maximum.

.~

-

(b) How three phase to two phase conversion is possible using two single

.

phase transformers.
./

Q9) (a). A 3-phase, 6600/415 V, 2,000kvA transfomler has a per unit resistance
of 0.02 and a per unit leakage reactance ?f 0.1. Calculate the Copper
loss and regulation at full16ad 0.8 ~o~er factor.
(b)

Two single ph'!Se furnaces working at 100 V are connected to 3300 V, 3.phase mains through Scott connect~d transformers. Calculate the current
, in each line of the 3-phase mains when the power taken by each furnace
is 400
kW at a power factor
of 0.8 lagging. Neglect losses in the
.
.
transformer.
.

~,~

~~

.

~
"

M-582

3


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