Instrumentation

Electronic Measurement and Instrumentation – Question Paper – Oct 2012

Electronic Measurement and Instrumentation (TEC-303)
2nd Sessional Examination 2012-13
B.Tech (ECE) 2ndYear
Attempt any Three Questions. Write down your Roll No on the Question paper.                       M.M. 30
   Time: 1.00 Hr
  1. (a) What are the essentials of an electronic instrument? and (b) Explain briefly Rectifier type A.C. voltmeter?
  2. With the help of a block diagram, describe briefly the working of a successive approximation digital voltmeter.
  3. (a) Explain briefly how “inductance” can be measured by using a ‘Maxwell bridge’. (b) In a Kelvin double bridge,there is error due to mistakes between the ratios between outer and inner arm resistances.

    The following data related to this bridge: Standard resistance=100.03 µΩ, inner ratio arms=100.31 Ω and 200 Ω, outer ratio arms= 100.24 Ω and 200 Ω. The resistance of connecting leads from standard to unknown resistor is 680 µΩ. Calculate the unknown resistances.

  4. (a) With the help of neat diagram, describe briefly “Megger”. and (b) Explain the following: i) Arithmetic mean, ii) Deviation from the mean, iii) Average deviation, iv) Standard deviation and v) Limiting errors.
By:
Paramjeet Singh Jamwal
Lecturer
Guru Nanak Education Trust Group Of Institutions
Roorkee – 247667, Uttarakhand, INDIA
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