Fill in the blanks 1 The repeat accuracy of an instrument can be judged from its _____ of error. 2 A _____ device prevents the oscillation of the moving system and enables the latter to reach its final position quickly. 3 A _____ is a passive transducer and is employed for converting mechanical displacement into a change of resistance. 4 LVDT windings are wound on _____ material. 5 Apermanent magnet moving coil instrument can be used as _____ by using a low resistance shunt. 6 Anull type of bridge with DC excitation is commonly known as _____ bridge. 7 Storage oscilloscope operates on _____ principle. 8 To avoid the effect of _____ in AC bridges we can use magnetic screening. 9 To measure the flux, devices used are based on _____ effect. 10 Aspectrum analyzer is used to measure _____ . 11 _____ shape signals are generated by Wien-bridge oscillators. 12 Most suitable material for a thermocouple is _____ . 13 Focusing and accelerating anodes are of _____ shape. 14 _____ technique is most widely used in the single channel data acquisition system.
Define: (1) Sensitivity, (2) Reproducibility, (3) Repeatability.
[3 marks]Give the difference between Systematic error and Random error.
[4 marks]What are the difficulties associated with low resistance measurement? Explain working principle of Kelvin’s double bridge.
[7 marks]Elaborate the Maxwell’s induction-capacitance bridge and give its advantages and disadvantages.
[7 marks]Draw and explain neat schematic diagram of Cathode Ray Tube.
[7 marks]Explain constant current mode and constant voltage mode with respect to Vector impedance meter.
[4 marks]What is deflection defocusing and its causes?
[3 marks]Why phosphor screen is provided with an aluminum layer in Cathode Ray Tube?
[4 marks]Explain Digital frequency meter.
[7 marks]Define: (1) gating error, (2) time base error, (3) trigger level error.
[3 marks]Explain the sweep frequency generator.1
[7 marks]Write advantages of Wien Bridge Oscillator.
[3 marks]Explain the two types of delay line in CRO.
[4 marks]Give applications of Wave analyzer.
[3 marks]Compare standard signal generator with modern signal generator.
[4 marks]Explain Resistance Temperature Detector and its lead compensation method.
[7 marks]What are the piezoresistive and piezoelectric effects?
[3 marks]What is Lock-in amplifier?
[4 marks]Elaborate Hall-effect transducer.
[7 marks]Note the importance any three components of Digital Acquisition System.
[3 marks]What are the advantages of opto-couplers?
[4 marks]Explain principle, operation, working, applications of LVDT.
[7 marks]