Yashwantrao Chavan Maharashtra Open University 2006 Certification TES Electronic Components and Materials - Question Paper

TES023/EE/20070816
Electronic Components and Materials
Time : 180 minutes Marks : 100
Instructions for the students :
1. All ques. are compulsory.
2. “Long ans kind ques. (LAQ)” is a supply kind ques. of 20 marks,
which require typical ans of about 60-80 lines in about 32-40 minutes.
3. “Short ans kind ques. (SAQ)” is a supply kind ques. of five marks,
which require typical ans of about 15-20 lines in about 08-10 minutes.
4. Use of non-programmable kind of scientific calculator is allowed.
5. Draw neat diagrams wherever necessary.
6. presume suitable data if necessary.


Long ans kind ques. (LAQ’s)

1. (a) Complete the subsequent conversions :
1) 1500 MHz = …… GHz
2) 4.6 pJ = ……. J
3) 14 fs = ……. µs
4) 3.2 ns = … .. ..hr
5) 125 nH = ……. µH
(b) Classify and discuss the standard of measurements. How is
the absolute Ampere described ?
(c) A 0-150 V voltmeter has a guaranteed accuracy of 1% fullscale
reading. The voltage measured by this instrument is
63 V. compute the limiting fault in percent.


2. discuss the operation of the subsequent instruments in detail :
a) Electrodynamometer for AC measurement
b) Watt hour meter
c) Power factor meter
d) Thermo instruments



3. (a) With the help of a neat diagram, discuss the operation of
‘Hay Bridge’. Derive the formula for balanced condition.
Mention the application area of the Hay Bridge.
(b) With the help of a neat diagram, discuss the operation of
‘Wien Bridge’. Derive an formula for the notch frequency.
Mention the application area of the Wien Bridge.

4. (a) With the help of a block diagram, discuss the operation of a
‘Digital storage oscilloscope’.
How does the digital storage oscilloscope differ from
conventional storage oscilloscope using storage CRT ? What
are the advantages of every ?
(b) What is delayed sweep ? When is it used ?
(c) Compare alternate sweep and chopped sweep. When would
one method be chosen over other ?



Short ans kind ques. (SAQ’s)
5. elaborate IEEE standards ? How do these standards differ from
those maintained by national standards laboratories ?

6. discuss Instrument Transformers in detail. 5
7. Write a short note on ‘Kelvin double Bridge’. 5
8. Write a short note on ‘Sampling Oscilloscope’.

Earning:   Approval pending.