Electrical Measurements Instrumentation (KEE302) - AKTU Question Paper 2021-22
B.Tech · Semester 4 · Free PDF Download
This is the official AKTU Electrical Measurements Instrumentation Previous Year Question Paper for B.Tech Semester 4, academic session 2021-22. Published by Dr. A.P.J. Abdul Kalam Technical University (AKTU/UPTU), Lucknow. Free PDF download — no login required.
Course:B.Tech
Semester:Semester 4
Session:2021-22
University:AKTU / UPTU
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Questions Asked in 2021-22
Electrical Measurements Instrumentation (KEE302) — extracted question text
Section AAttempt all questions in brief. 2 x 10 = 20
- aDifferentiate between null type and deflection type of measuring instruments along with suitable example
- bA voltage has true value of 1.50 V. An analog indicating instrument with scale range of 0-2.50 V show a voltage of 1.46 V. What are the value of absolute error and correction? Express the error as fraction of true value
- cEnlist the errors found in Wheatstone bridge. 2 2
- dJustify the need of modified Schottky bridge. 2 2
- eDefine Nominal ratio and Transformation ratio for CT and PT. 2 3
- fExplain the term “Burden of Instrument Transformers” 2 3
- gDraw the Lissajous pattern for frequency ratio 3:2 2 4
- hWrite principal of operation of digital frequency meter. 2 4 i. Differentiate active and passive type of transducers with suitable example. 2 5 j. Write principle of operation of Thermocouple. 2 5
Section BAttempt any three of the following: 3 x 10 = 30
- aDefine the limiting Error. The resistance value for three registers are specified as 𝑅ଵൌ 100 Ω േ5 %, 𝑅ଶൌ 75 Ω േ5 % and 𝑅ଷൌ 50 Ω േ5 % . Determine the value of limiting error in ohms and in percentage for the total equivalent resistance, if they are connected in (i) Series and (ii) parallel, connection respectively
- bDescribe the working of Hay’s bridge for measurement of inductance. Derive the equations for balance and draw the phasor diagram. A Hay’s bridge is configured as follows, Arm AB: A choke coil having a resistance R1 and inductance L1, Arm BC: a non inductive resistance R3, Arm CD: a mica condenser C4 in series with a non-inductive resistance R4, Arm DA: a non inductive resistance R2. A supply of 300 V and 500 Hz is given between terminals A and C and detector is connected between nodes B and D. The balance is obtain under the following condition. R2 = 2410 Ω, R3 = 750 Ω, R4 = 64.5 Ω and C4 = 0.35 μF and a series resistance of capacitor=0.4 Ω. Determine the inductance L1 and resistance R1 of unknown choke coil
- cThe current transformer with 5 primary turns has a secondary burden consisting of
- aresistance of 0.16 Ω and an inductive reactance of 0.12 Ω. When the primary current is 200 A, the magnetising current is 1.5 A and the iron loss current is 0.4 A. Find the number of secondary turns needed to make the current ratio 100.1 and also find the phase angle
- dClassify different types of digital voltmeters. Explain Integrated type of digital voltmeters with the help of suitable diagrams
- eDescribe the principle of operation, construction, working of piezoelectric transducers. Derive the expression for output voltage. A piezoelectric crystal has a thickness of 2.5 mm and voltage sensitivity 0.05 Vm/N. Determine the output voltage when it is subjected to a pressure of 1.6 ×106
Section CAttempt any one part of the following: 1 x 10 = 10
- aIllustrate the construction and operation of moving iron type of instruments. Also derive the expression of deflecting torque. Enlist the advantages, disadvantages of these instruments
- bDerive and illustrate the condition for balance with suitable circuit diagram for Kelvin’s Double bridge
- aDerive balance equation of Maxwell’s Inductance-Capacitance Bridge along with its phasor diagram. Also find the storage factor for this bridge. Mention advantages and disadvantages of this bridge
- bDerive the equation of balance for Schering bridge. Also draw its phasor diagram. Discuss how dissipation factor of a capacitor can be measured by it
- aDraw the equivalent circuit and phasor diagram of a current transformer. Derive the expression for ratio and phase angle
- bA current transformer of turns ratio 1:199 is rated as 1000/5 A, 25 VA. The core loss and magnetizing component of the primary current are 4A and 7A under rated conditions. Determine the phase angle and ratio errors for the rated burden and rated secondary current of 0.8 p.f. lagging and 0.8 p.f. leading. Neglect the resistance and leakage resistance of secondary winding
- aDefine spectrum analyzer. Classify different types of spectrum analyzers and explain basic spectrum analyzer with neat block diagram. Also give the applications of wave analyzers
- bDescribe the construction and working of general purpose CRO using block diagram and explain its components in detail
- aDiscuss factors for selecting a transducer. Explain pressure capacitance transducer with a neat diagram. State advantages and disadvantages of a capacitive transducer
- bExplain the principle, construction and working of strain gauge transducer and formulate the expression for gauge factor in terms of Poisson’s ratio. A resistance strain gauge with a gauge factor 3 is fastened to a steel member subjected to a stress of 100 N/mm 2. The modulus of elasticity of steel is approximately 2 x 105 N/mm2. Estimate the value of percentage change in the resistance
Question text is extracted from the official AKTU question paper PDF above. Check the original PDF for equations, diagrams and complete wording. Extracted: 2026-08-23.
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