JNTU
JNTU B.Tech II ELECTRICAL AND ELECTRONIC MEASUREMENTS Previous Question Paper (May/June - 2019 - R16)
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
Give a brief classification of electrical measuring instruments.
Answer
Electrical measuring instruments are primarily classified into two categories: Absolute instruments, which give the value of the quantity in terms of physical constants (e.g., Tangent Galvanometer), and Secondary instruments, which are calibrated by comparison with an absolute instrument and provide direct readings (e.g., Ammeters, Voltmeters).
What are the different torques that are produced in a measuring instrument?
Answer
To ensure proper operation, an analog instrument requires three essential torques: 1) Deflecting torque, which moves the pointer from its zero position; 2) Controlling torque, which opposes the deflecting torque to bring the pointer to a steady state; and 3) Damping torque, which brings the pointer to rest quickly by eliminating oscillations.
What is burden in an instrument transformer?
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Differentiate between CT and PT.
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Name the errors caused in dynamometer type watt meters.
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What are the constructional parts of dynamometer type wattmeter?
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What are the advantages and disadvantages of Maxwell’s inductance bridge?
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What are the differences in measuring capacitance by desauty’s bridge and schering bridge?
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State the advantages of electrical transducers.
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What are the basis on which transducers are classified?
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Part B
Explain the construction and working of PMMC Instruments.
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Explain attraction type moving iron instruments.
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Derive expressions for deflecting torque and controlling torque in PMMC instruments.
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What are shunts and multipliers? Explain how they can be used to extend range of ammeters and voltmeters.
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Explain the principle of operation and working of DC Crompton potentiometer.
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Explain application of dc potentiometer for calibration of voltmeter and ammeter.
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What are the different types of AC Potentiometers? Explain polar potentiometers.
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Explain the applications of AC Potentiometer for calibration for wattmeter and energy meter.
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Explain the methods of measuring three phase power by two watt meter method.
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Explain the method of measuring power by using instrument transformers.
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Explain the method of measuring reactive power in three phase circuits.
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Explain the working of single phase induction type energy meter.
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Explain how Kelvin’s double bridge can be used for measurement of low resistance.
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List the various methods of measuring high resistance. Explain loss of charge method.
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Explain method of measuring inductance by owen’s bridge.
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Explain method of measuring earth resistance by earth tester.
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Explain the measurement of angular velocity with tachometer.
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Explain the measurement of linear velocity with electromagnetic transducer.
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Explain the measurement of temperature by resistance thermometer.
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Explain the operation of photo conductive cells and photo diodes.
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