Testing and Commissioning of Electrical Equipments (2180901)
(1) Why the earthing resistance is kept minimum for safety of human being? What is the effect if earthing resistance is high? Explain three point method for measurement of earthing resistance.
(2) What is difference between equipment earthing and system grounding? Explain earthing procedure for substation.
(3) Which type of test is conducted on electrical equipment during its manufacturing process?
(4) Explain steps of drying out of big size of transformer.
5) Explain how the transformer group DY1 and DY11 is to be tested.
(6) Explain routine maintenance procedure for a power transformer.
(7) Explain test methods for Temperature rise of Transformer as per IS 2026.
(8) Explain Vector group of transformer.
(9) How the switching impulse test and high voltage test is conducted on transformer?
(10) Why the tape changer is kept on HV side of transformer? Give your justification.
(11) State various troubles, causes and preventive actions for failure of Power transformer.
(12) For below listed troubles in power transformer, state its causes and remedies:
a) Internal short circuit b) Overheating c) Rapid deterioration of oil.
(13) Explain the no load test and blocked rotor test of an induction motor. What data such test
provides?
(14) Explain Hopkinson’s test with its circuit diagram.
(15) State the various types of enclosures for rotating Electrical Machines and the type of cooling adopted in them.
(16) Explain different methods of drying out of Rotating Machine.
(17) Explain phase sequence test of synchronous Machines as per IS 7312: 1973.
(18) What is degree of protection? How it is designated? What is IP and IC code?
(19) Explain rating and estimation of rating of rotating electrical machines.
(20) State various troubles of DC motors, their causes and remedies.
(21) Explain alignment of Electrical Machines.
(23) How the PI is measured of rotating machine? What is the significance of it on performance of rotating machine?
(24) Explain closing and opening mechanism in circuit breaker.
(25) Explain the working of ELCB? What are the different tests performed on it?
(26) Explain mechanical endurance test on circuit breaker.
(27) Explain any two routine test to be performed on circuit breaker.
(28) Which are different components of sub-station? What are the functions of each component in sub-station?
(29) Explain Murray loop test for ground fault location in underground cable.
(30) Explain Varley loop test for finding cable fault.
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