Q bank of Testing & Commissioning of Electrical Equipments(For MID-1 only)

Subject Code: 2180901
Subject: Testing & Commissioning of Electrical Equipments

1	Draw DY1 & DY11 type transformer connections & state feasibility of connecting them in parallel with reason
2	Explain polarity test of power transformer
3	Explain meaning of insulation resistance. How is it measured for power transformer
4	Define a burden on a CT. What are the markings on primary & secondary terminal CTs? How the polarity of CT is determined.
5	Explain various troubles, causes & remedies of 3 phase induction motors
6	What is ‘slip’ of an Induction motor? How can you measure the slip of an induction Motor?
7	Explain starting test & No load test on 3-phase induction motor.
8	Explain Back to back test on DC Machine
9	Explain Field test on DC Machine
10	Explain tan delta test.
11	Explain procedure for determination of polarization index for transformer
12	Explain procedure for drying out of transformer.
13	Explain behavior of 3 phase induction motor under abnormal frequency condition and under single phasing condition.
14	How could you measure DC resistance of 3 phase induction motor?
15	Give reasons and remedial steps for 3 phase slip-ring induction motor for following conditions: 1) Motor fails to start. 2) Motor runs slow. 3) Motor runs hot.
16	Explain polarity test, ratio checking test and phase sequence test on potential transformer.
17	Enlist mechanical and electrical test required before commissioning of dc machine. Also write condition for normal working of the dc machine.
18	Explain Growler and drop test by voltmeter for finding fault location in armature winding.
19	List out the various tests on transformer. Explain temp. Rise test for same.
20	Explain power frequency and impulse voltage withstand test on three phase distribution transformer
21	Explain the purification and filtration process of transformer oil.
22	Give causes, consequences and remedies for the following abnormal conditions of 3-phase induction motor. 1. Overheating 2. Stalling 3. Excessive speed.
23	State the methods of measurement of slip of induction motor. Also explain any one in detail.
24	Explain procedure for conducting Full load test on 3-phase induction motor. Also analyze characteristics of diff. parameters with curves.
25	What is the necessity of drying of electrical equipment? Explain polarization index of 3-phase induction motor.
26	Explain the significance of following in performance of electrical equipments. 1. Interpoles in d.c. m/c 2. Partial discharge test on transformer 3. Insulation co-ordination in sub station
27	Explain the causes of various troubles with commutator and brush gear in d.c. machines. Give remedies for same
28	Define Degree of Protection of Induction Motor.Explain I.P. and I.C. codes for same.
29	Explain purposes for performing No-load and Blocked rotor tests on 3-ф induction motor.
30	State the properties of good transformer oil? Explain BDV test on transformer oil.
31	List out the commissioning tests on power transformer. Explain the Voltage ratio test with the help of circuit diagram.
32	Explain drying out procedure of a 3-ф induction motor
33	For the following conditions explain in detail troubles, causes and its remedies for 3-ф squirrel cage induction motor. i) Motor fails to start ii) Motor runs at 1/7th synchronous speed. iii) Motor heats up
34	State different tests to be performed on DC machine for efficiency determination. Which test is best out of all on DC shunt motor? Justify your answer.
35	Differentiate between type and routine test. Explain any two routine test of Power transformer with necessary circuit diagram.
36	Explain the Troubleshooting and Maintenance of induction motor.
37	Explain the significance of Polarization Index Number. Explain drying out procedure of Power Transformer.
38	Explain the Phase group of Power Transformer with necessary vector and winding diagram.
39	Explain variation of voltage and frequency on performance of Induction motor.
40	Explain Hopkinson’s Test of D.C.Machines.
41	Explain the following test regarding transformer (1) Polarity test (2) Loss measurement (3) Power frequency with stand test.
42	What is the significance of polarity in case of current transformer? How can we test the polarity of C.T?
43	How the D.C/A.C resistance, insulation resistance and block rotor test can be performed on three phase induction motor?
44	What is the significance of partial discharge measurement and Tan Delta test in case of transformer?
45	How can we find Dy1 & Dy11 connection in the case of transformer?
46	How can you find out the polarity test in case of three phase power transformer and what is the significance of it? Can we connect Dy1 & Dy11 transformer in parallel? Give your reason.
47	Explain noise measurement, vibration measurement and slip measurement in case of three phase induction motor. Prof. P.K.Shah