1.
The silicon steel preferably used in transformer core. Because it has ___________
2.
The transformer core ins laminated . It is because _____________
3.
The thickness of a transformer core is t mm. The hysteresis losses occurs in transformer is proportional to
4.
The voltage ratio of the transformer in between primary and secondary winding given by
5.
The number of turns in a secondary side of the transformer is 38. The rating of the transformer is 3300/250V 50 HZ. Find the number of turns in secondary side
6.
The number of turns in a secondary side of the transformer is 38. The rating of the transformer is 3300/250V 50 HZ.Find the emf induced per turn
7.
A transformer connected with a input supply and operating at no load condition. The losses occurring inside the transformer are __________
8.
A single phase transformer is having core thickness of t mm and magnetic flux density B. How eddy current losses are depends on these parameters?
9.
Which is the following transformer is always connected with load throughout day
10.
The general working principle of a transformer is
1 out of 5
11.
The shell type transformer used in single phase will be ___________ number of cores
12.
There are 4000 turns per phase in the HV winding of a particular transformer, then number of turns per phase in the same winding for 2.5% tapping
13.
There are 4000 turns per phase in the HV winding of a particular transformer, then number of turns per phase in the same winding for 5% tapping
14.
Tertiary winding in a transformer usually connected as
15.
A single phase transformer has primary and secondary turns are 250 and 1000 respectively. If transformer connected with 230V primary voltage, what will be the secondary voltage induced in it?
16.
In a transformer number of primary turns are reduced to 50% and same time input applied voltage increased to 200%. Then emf induced in secondary side _______________ compared with primary
17.
The iron losses are measured in a transformer when it operating at no load condition is 500 W. When it connected to the full load, calculate the iron losses occurring?
18.
When a transformer is operating at maximum efficiency, It is looses is 3500 KW. What will be the copper losses
19.
The thickness of the transformer core in generally
20.
The magnetic circuit of a transformer known as ______________
2 out of 5
21.
The copper losses of a transformer is 1600 W. If load reduced by 0.5% of its full load. Find the copper losses
22.
The breather in the oil cooled transmformer , filled with ______________
23.
The porceleain insulators are used in transformer bushing used in __________ grade of transformer
24.
A 20 KVA 2200/220V ,50 HZ single phase transformer primary winding reduced by 0.8 ohm. The resistnace of primary related to secondary
25.
When comparing with hot rolled steel, losses in cold rolled steels are reduced by ______________
26.
A distibution transformer operating under leading power factor condition. Select the correct relation between No load voltage ( E ) and full load voltage (V)
27.
Find the current flowing thorugh secondary winding of transformer has rating 25KVA,6600/440V. Consider that transformer is operating under full load condition
28.
Find the current flowing thorugh primary winding of transformer has rating 25KVA,6600/440V. Consider that transformer is operating under full load condition
29.
The voltage regulation of the transformer is operating is operating at leading power factor
30.
The purpose of breather used in a transformer __________________
3 out of 5
31.
The reactance and resistance corresponding to the line losses component is 300 Ohm and 600 Ohm respectively. The rating of transformer is 200/400. Find the no load current
32.
If the primary exciting current vary by sinusoidal, the flux generated by the transformer also ____________
33.
If the Emf induced winding is flat topped, the core losses will be
34.
A 1000 KVA 11000/440 V 3 ph. 50Hz transformer is operating at no load condition. Find the voltage across secondary terminal
35.
A 1000 KVA 11000/440 V 3 ph. 50Hz transformer is operating at no load condition. Find the current flowing through the secondary winding if power factor is 0.8
37.
The flux linkages between primary and secondary winding of transformer is 0.06 wb. The cross sectional area of the core is 400 Sq.cm. Find the flux density
38.
The total losses occurring in a transformer rating 3KVA is operating at full load is about
39.
The transformer is generally rated in _________
40.
A 1000 KVA 11000/440 V 3 ph. 50Hz transformer is operating at no load condition. Find the terminal voltage across the secondary winding
4 out of 5
41.
The maximum efficiency of a transformer can be achieved under ________ full load condition
42.
If the B is maximum flux density of the core of a transformer, Hysteresis losses is proportional to
43.
In high voltage transformers , saving the insulation, star connection is compared to delta is about _____
44.
The transformer will operate at maximum efficiency, when the following condition is satisfied
46.
The transformer has two winding i.e. primary and secondary on same core. The iron losses will occur on
48.
The power factor of a transformer is always
49.
In small capacity of transformer shape of winding conductors are used in both primary and secondary windings are
50.
When Emf induced in transformer winding is peak. Eddy current losses of the same transformer will be ____________
5 out of 5
