31 | Page ZIET BHUBANESWAR/ T Samrajya Lakshmi PGT (Physics) ALTERNATING CURRENT Test Paper-III MAX MARKS: 30 TIME: 90Mts Sl. No. QUESTION ANSWER PAGE MARKS 1 What is purpose of a transformer? Give the principle on which a transformer works. Page:259 Β½ + Β½ 2 Explain the working of a transformer with a neat labelled diagram Page:260 3 3 Give any two arrangements in which the coils can be placed to form transformer Page:260 Β½ + Β½ 4 Give the differences between step up transformer and step down transformer Page:261 2 5 What are the different losses in case of a transformer? How will you reduce these losses? Page:261 3 Marks: 12 marks Match the following Page: 262 Part-A Part-B 1 Rms value of current I= 0.707im 2 Mean value of current over complete cycle V=V m sinΟt 3 Ac voltage X L =ΟL 4 Capacitive reactance cosΟ 5 Inductive reactance Ο 0 L/R 6 Power factor zero 7 Q-factor Ο 0 = 1/β 8 Resonant frequency VI cosΟ 9 Average power loss over a complete cycle 10 Impedance of LCR series circuit = [ ] 11 Voltage across the secondary of a transformer Xc= 1/ΟC 12 Current through the primary of a transformer = [ ] Downloaded from www.studiestoday.com Downloaded from www.studiestoday.com
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![Page 1: Downloaded from ...transformer Xc= 1/ΟC 12 Current through the primary of a transformer π =[π π ]π Downloaded from from 32 | P a g e Z I E T B H U B A N E S W A R / T](https://reader031.cupdf.com/reader031/viewer/2022011815/5e605a735d663b7a06063133/html5/thumbnails/1.jpg)
31 | P a g e Z I E T B H U B A N E S W A R / T S a m r a j y a L a k s h m i P G T ( P h y s i c s )
ALTERNATING CURRENT
Test Paper-III
MAX MARKS: 30 TIME: 90Mts
Sl. No. QUESTION ANSWER PAGE MARKS
1 What is purpose of a transformer? Give the principle on which a transformer works.
Page:259
Β½ +
Β½
2 Explain the working of a transformer with a neat labelled diagram Page:260 3
3 Give any two arrangements in which the coils can be placed to form transformer
Page:260
Β½ +
Β½
4 Give the differences between step up transformer and step down transformer Page:261 2
5 What are the different losses in case of a transformer? How will you reduce these
losses? Page:261
3
Marks: 12 marks Match the following Page: 262
Part-A Part-B
1 Rms value of current I= 0.707im
2 Mean value of current over complete cycle V=Vm sinΟt
3 Ac voltage XL=ΟL
4 Capacitive reactance cosΟ
5 Inductive reactance Ο0 L/R
6 Power factor zero
7
Q-factor Ο0 =1/βπΏπΆ
8 Resonant frequency VI cosΟ
9 Average power loss over a complete cycle
10 Impedance of LCR series circuit πΌπ = [ππ
ππ ] πΌπ
11 Voltage across the secondary of a
transformer
Xc= 1/ΟC
12 Current through the primary of a
transformer ππ = [
ππ
ππ] ππ
Downloaded from www.studiestoday.com
Downloaded from www.studiestoday.com
![Page 2: Downloaded from ...transformer Xc= 1/ΟC 12 Current through the primary of a transformer π =[π π ]π Downloaded from from 32 | P a g e Z I E T B H U B A N E S W A R / T](https://reader031.cupdf.com/reader031/viewer/2022011815/5e605a735d663b7a06063133/html5/thumbnails/2.jpg)
32 | P a g e Z I E T B H U B A N E S W A R / T S a m r a j y a L a k s h m i P G T ( P h y s i c s )
Write the dimensional formula of the following 8 marks
Page: 264
1 Rms value of current -----------------------
2 rms voltage-------------------------------
3 Capacitive reactance-------------------------------
4 Inductive reactance-----------------------------
5 Power factor-------------------------------------------
6 Q-factor-------------------------------------------------
7 Resonant frequency----------------------------------
8 Impedance of LCR series circuit------------------------
Downloaded from www.studiestoday.com
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