JNTU II B.Tech I Semester Regular Examinations, November 2008
CALIBRATION AND ELECTRONIC MEASUREMENTS
(Instrumentation & Control Engineering)
1. (a) Define the terms accuracy, error, precision, resolution, expected value, and sensitivity.
(b) The expected value of the voltage across a resistor is 80 V. However, the measurement gives a value of 79V. Calculate:
i. Absolute error
ii. Percent error
iii. Relative accuracy and
iv. Percentage of accuracy.
2. (a) What are the primary and secondary working standards of emf?
(b) Explain their construction and characteristics with neat diagrams.
3. Distinguish between primary and secondary calibrations.
4. Draw the block diagram of a true rms reading voltmeter using thermocouples. Describe its operation in detail. Explain how these voltmeters are free from waveform errors.
5. What are incremental inductance and permeability? Describe how are they mea-
sured with Owen’s bridge.
6. Explain the design based considerations of a frequency counter.
7. How is the electron beam focused on to a fine spot on the face of the CRT ? Explain
the function of the following controls:
(a) Z modulation
(b) Astigmatism and
(c) Delayed sweep.
8. Give the constructional features of strip chart recorders. State its applications.