JNTU
JNTU B.Tech III ELECTRONIC MEASUREMENTS AND INSTRUMENTATION Previous Question Paper (May/June - 2019 - R13)
Note: This question paper contains two parts A and B. Part A is compulsory which carries 25 marks. Answer all questions in Part A. Part B consists of 5 Units. Answer any one full question from each unit. Each question carries 10 marks.
Part A
Define sensitivity and precision of an instrument.
Answer
Sensitivity is the ratio of the change in output of an instrument to the change in the input being measured. Precision is the degree of reproducibility of a series of measurements, indicating how closely repeated measurements of the same quantity agree with each other.
Write how the range of DC voltmeter is extended.
Answer
The range of a DC voltmeter is extended by connecting a high-value resistor, known as a multiplier, in series with the basic D'Arsonval meter movement. This limits the current flowing through the meter to its full-scale deflection value while allowing a higher voltage to be measured across the combination.
State the terms Dynamic range and Harmonic mixing.
Answer
Sign in to view the complete answer paper.
Summarize the applications of spectrum analyzer.
Answer
Sign in to view the complete answer paper.
Interpret the active probes used with CRO.
Answer
Sign in to view the complete answer paper.
State the features of a Dual beam oscilloscope.
Answer
Sign in to view the complete answer paper.
Define active and passive transducer.
Answer
Sign in to view the complete answer paper.
Differentiate photoelectric and piezo-electric transducers.
Answer
Sign in to view the complete answer paper.
List out the different Limitations of Wheat stone’s Bridge.
Answer
Sign in to view the complete answer paper.
Define Quality factor and give the expressions for the inductive and capacitive Quality factors.
Answer
Sign in to view the complete answer paper.
Part B
Explain the following terms in detail: (i) Accuracy (ii) Resolution (iii) Precision (iv) Expected value
Answer
Sign in to view the complete answer paper.
Two ammeters are joined in series in a circuit carrying 100 A. One ammeter has a resistance of 10000 ohm shunted by 0.10 ohm while the other ammeter has a resistance of 150 ohm shunted by 0.02ohm. If the shunts are interchanged what would be the readings of the instruments?
Answer
Sign in to view the complete answer paper.
Discuss the working of a potentiometer type digital voltmeter.
Answer
Sign in to view the complete answer paper.
Explain the principle operation of multimeters.
Answer
Sign in to view the complete answer paper.
Explain the operation of Harmonic Distortion Analyzer.
Answer
Sign in to view the complete answer paper.
Draw the circuit diagram of Sweep generator and explain its operation.
Answer
Sign in to view the complete answer paper.
Explain the working of a AF wave analyzer using a block diagram.
Answer
Sign in to view the complete answer paper.
Discuss the functionality of pulse wave generator.
Answer
Sign in to view the complete answer paper.
An electrical deflected CRT has a final anode voltage of 2000V and parallel deflecting plates of 1.5cm long and 5mm apart. If the screen is 50cm from the centre of the deflecting plates. Find: (i) Beam speed (ii) Deflection sensitivity of the tube (iii) Deflection factor of the tube.
Answer
Sign in to view the complete answer paper.
Draw the circuit diagram of sampling oscilloscope and explain its operation.
Answer
Sign in to view the complete answer paper.
Describe the operation of vertical amplifier used in a CRO.
Answer
Sign in to view the complete answer paper.
Explain the principle and working of a storage oscilloscope.
Answer
Sign in to view the complete answer paper.
Explain the operation of proximity transducer.
Answer
Sign in to view the complete answer paper.
Discuss how an LVDT can be used to measure the pressure.
Answer
Sign in to view the complete answer paper.
Explain the principle of operation of strain gauges with the help of neat diagrams.
Answer
Sign in to view the complete answer paper.
Describe the modes of operation of piezo electric crystals.
Answer
Sign in to view the complete answer paper.
Draw the circuit diagram of Maxwell’s bridge and derive conditions of balance.
Answer
Sign in to view the complete answer paper.
In case of a Schering bridge, arm AC has R=4.7KΩ. Arm CD has unknown elements. Arm BD has C=0.1μf, Arm AB=4.7KΩ is shunt with 1MF. Determine values of components in the Arm CD.
Answer
Sign in to view the complete answer paper.
Describe the method of measuring high pressure.
Answer
Sign in to view the complete answer paper.
An unbalanced wheat stone bridge has the following resistances, with R1=1 KΩ, R2=2.5 KΩ, R3=3.5 KΩ, R4=10 KΩ with a battery voltage of 6V and a galvanometer resistance of Rg=300 Ω. Calculate the current through the galvanometer.
Answer
Sign in to view the complete answer paper.