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APJ ABDUL KALAM ലഡഡ.
L018

SEVENTH SEMES ⋅
∥∣↘⇁⋅∣∖∣∥⊐⋅∎∣∣∖⋅∥⋅⊓↴↖⋅∣∣∣≻∣↖⋅⋯∣⋅∣⊳⋅∖⋅∖⊳∖↴∥∙⋅∖⇃∖∣⋯⋅∖⋅⋅⊓⊔⋅∣∖⋅⋯∣⋮∣

↖∎⋯∥⋅∖↖⋅↖∎⋯∣↳⋅∶∎⋅⋅∣⋅⋡−∥∣∣⇂

Max. Marks: 100

سے 1 ^

11

12

a)
b)

a)

b)

a)
b)

^ i பி N 7 जर ١ 929 ४ १ ۰ 7 ५६ 0 N
Ourse Name: ELEC PRICAL MACHINE DESIG!
Duration: 3 Hours
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തന്‌ PART A ∙⋅ Marks
List fi swer all questions, cach ಟು]
St five types of enn

3105 ‏اہ‎ enclosures used in electrical machines. ‏ا‎

(5)

sidered (5)

Deriv
© the output ٤٥1 ⋅
Define ‏عه‎ 11110 single phase core type ,ವ
ட்‌ ७ பவடய ⋅∼ ⋅
for choice of spe ‏دو ا‎ loading? Explain. the ಲ te be eee
0೮೮111೮ magnetic loading ina de machine
४ ۱ (5)

Jr e 8
Write short notes On (1) Short ۳٢ں ‏ألم‎
‎How do you separate *1)* ireuit ratio Gi) Run away speed ⋅ (5)
1 oS and 1111 க 510661] "(1011 ^
motor? md ` 1. ` from the volume D°L. of a3 phase 11111/೮116
Explain ‏ا‎ −
2 1८ rules for select ⋅ i (5)
electing ∙⋅⋅ ∙ பாப்பி ∙
motor, 2 Huber of rotor slots ina tires Phase 7
What is me: ⋅⋡⋅ ⊲⋅
[3 Meant by discretization in (111! lene १) (5)
Explain the hybrid i − ‏لي‎ " ` 0
0൧19 techniques available for computer aided design, (8)
; PART B
Answer any tivo full questions, each carries 10 marks.
Examine ⋅∙∙⇁ − ⋅ ‘
the different (५ [८४ of ventilations in (५८५1 111111 (१)
(0)
(10)

Der Ive the gape 111141८ (|. fact OF SLOLS 210 1) Se
0111110810 ಟಿ Poste
ல்‌ SIs \ pha

Determine the dimensions of core and ‏ون زوب‎ ۵۸ 5011
01 type transformer. A square core is used with distance between the
adjacent limbs equal to 1.6 times the width of laminations. Assume ١١

3 ۸/۱۱۰ ۷٦|

1۱4۷, Maximum flux density 1.1 11/೧/1725. current density

space factor 0.32, stacking factor 0.9. 110७ density in the yoke to be 80% of

flux density in the core.

Explain the procedure to calculate MME for air gap and teeth ೬ electrical ಟಿ)
(3)

machine.
Derive the volt per turn equation of a single phase transformer,

PART C
Answer any tivo full questions, each carries 10 marks.
Explain in steps how to separate D and ‏سا‎ for a DC machine? (3)
Find out the main dimensions of a ३0६१४. 4 pole, 000 rpm DC shunt generator (7)
to give a square pole 1000, The full load terminal voltage being 220 ४. The
maximum gap densily is 0.83 ചര്‌ and the ampere conductors per meter is
that full load armature voltage drop is 3 per cent of rated

30000. Assume

terminal voltage and that the field current is | per cent of rated Tall load

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