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Solve any one question fromQ.1(a,b) and Q.2(a,b)
1(a)
O.C. and S.C. test has been conducted on 200/400 V, 1-ph transformer:
O.C. Test: 200V, 0.8A, 80W ...........on L.V. side
S.C. Test: 15V, 10A, 100W ....... on H.V. side
Calculate:
i) No load current components.
ii) Equivalent resistance and reactance referred on primary (L.V) side.
O.C. Test: 200V, 0.8A, 80W ...........on L.V. side
S.C. Test: 15V, 10A, 100W ....... on H.V. side
Calculate:
i) No load current components.
ii) Equivalent resistance and reactance referred on primary (L.V) side.
7 M
1(b)
With neat connection diagram, explain the procedure to conduct polarity test on 1-ph transformer.
6 M
2(a)
Explain V-V connection and obtain the relation between V-V capacity to delta-delta capacity. Also state advantages and disadvantages of this connection.
7 M
2(b)
Sketch and explain phasor diagram of transformer on load at:
i) lagging p.f.
ii) leading p.f.
i) lagging p.f.
ii) leading p.f.
6 M
Solve any one question fromQ3(a,b) and Q.4(a,b)
3(a)
Explain the speed control of d.c.series motor by various flux control methods.
6 M
3(b)
A 9 kW, 200V, 4 pole de series motor with 800 wave connected conductors draws a current of 50 A. The flux per pole is 25 mWb and armature circuit resistance is 0.5 Ω Calculate: i) arm torque
ii) shaft torque.
ii) shaft torque.
6 M
4(a)
Obtain the emf equation of d.c. generator.
6 M
4(b)
What is commutation? What are the causes of bad commutation? Explain remedial measures on it.
6 M
Solve any one question fromQ5(a,b) and Q.6(a,b)
5(a)
Compare squirrel cage rotor and wound rotor.
6 M
5(b)
A 3-ph, 8-pole, 50 Hz induction motor runs at 720 rpm at full load. The rotor resistance per phase is 0.01Ω and standstill reactance/ph is 0.1 Ω Calculate:
i) ratio of max torque to full load torque
ii) speed at Tmax.
i) ratio of max torque to full load torque
ii) speed at Tmax.
6 M
6(a)
Obtain the torque equation of 3-ph induction motor at running condition.
6 M
6(b)
Obtain the relationship between rotor Cu loss and rotor gross output in terms of slip of 3-ph induction motor.
6 M
Solve any one question fromQ.7(a,b) and Q.8(a,b)
7(a)
With neat connection diagrams, explain the procedure to conduct no load test and blocked rotor test on 3-ph induction motor.
6 M
7(b)
Draw the circle diagrams, showing all the quantities and explain the procedure how to draw it.
7 M
8(a)
What is necessity of starter for 3-ph induction motor? Explain star- delta starter.
7 M
8(b)
Explain the testing of 3-ph induction motor by I.S.-325.
6 M
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