UPTU Old Question Papers
B Tech 8th Semester
Digital Measurement Techniques 2007
Note : Attempt all questions
1. Attempt any two parts of the following :
(a) Explain in brief the philosophy of digital and microprocessor / microcontroller based instruments.
(b) What are different time measurement techniques ? Explain how time interval between two events can be measured.
(c) Explain vernier techniques.
2. Attempt any two parts of the following :
(a) With the half of a neat sketch, explain the working principle of a deviation meter.
(b) Discuss a scheme for low frequency measurement.
(c) Enumerate the salient features of programmable filters.What are their main advantages and disadvantages ?
3. Attempt any four parts of the following :
(a) What is voltage to time converter ? Draw the circuit diagram of a basic v/t convertor and explain it. Also draw its output waveforms.
(b) Indicate the design produce for a dual-slope v/t converter capable of handling a maximum input voltage of +lv in the basic range and with a four-digit display of data.
(c) What are the major circuit blocks of a D/A convertor ? Draw the circuit diagram of the resistor network of a typical D/A convertor and explain it.
(c) What is pulse width-to-voltage convertor ? Show its schematic diagram, input and output waveforms and practical circuit.
(e) Explain the terms sampling and quantization related to A/D conversion.
(f) Explain the sampling theorem. What are its main applications ?
4. Attempt any four parts of the following :
(a) Explain the working principle of a digital ohmmeter. What are its main advantages ?
(b) Show the schematic of a ‘Q’ meter and explain in detail.
(c) Derive the signal flow graph for the N= 16 point, radix-4 decimation in frequency FFT algorithm in which the input sequence is in digit-reversed order and the output DFT is in normal order.
(d) Show the pole-zero pattern of a high pass filter and explain it.
(e) Show the pole-zero pattern of second order all pass filter and explain it.
(f) Convert the low pass filter described by the diffluence equation
y(n) = 0.9yh(n-l) + 0.1x(n) in to a high pass filter.
(f) The difference equation for the high pass filter is y(n) = -0.9;y (n -1) + 0.1 x(n) and its frequency response is Hhn(w) = —0,1 . hp l + 0.9e~JW