(SEM V) THEORY EXAMINATION 2022-23 ELECTRONIC INSTRUMENTATION & MEASUREMENTS

Course: B.Tech (Semester V)                                                                   Subject Code: KEC-057

Subject Name: Electronic Instrumentation & Measurements               Time: 3 Hours

Total Marks: 100

Note: Attempt all sections. If any data is missing, assume suitably. 

Section A – Short Answer Questions (2 × 10 = 20 Marks)

Answer all briefly:

Calculate the maximum percentage error in the difference of two measured voltages when V1=100±1%V_1 = 100 \pm 1\%V1​=100±1% and V2=80±5%V_2 = 80 \pm 5\%V2​=80±5%.

Define swamping resistance used in PMMC instruments.

What is calibration in measuring instruments?

Define 1:1 and 20:1 probes.

State the balance equation of Wheatstone bridge.

What is residual resistance and inductance in a Q-meter?

What is the role of time base circuit in a CRO?

Define interpolation in oscilloscope systems.

Define force transducer in measurement systems.

Draw the block diagram of a Data Acquisition System (DAS). 

 Section B – Descriptive Questions (10 × 3 = 30 Marks)

Attempt any three:

Explain DC ammeter and DC voltmeter in measurement systems.

Explain different types of digital multimeters with proper diagrams.

A Hay bridge operating at 100 Hz is balanced when
C3=0.1μF,R1=1.26kΩ,R3=65Ω,R4=600ΩC_3 = 0.1 \mu F, R_1 = 1.26 kΩ, R_3 = 65 Ω, R_4 = 600 ΩC3​=0.1μF,R1​=1.26kΩ,R3​=65Ω,R4​=600Ω.
→ Find inductance, resistance, and Q factor of the measured inductor.

Draw block diagram and waveform of a Digital Storage Oscilloscope (DSO) and explain its application.

Describe Hall-effect transducers and their applications. 

Section C – Long Answer Questions (10 × 5 = 50 Marks)

Question 3

(a) Explain working principle of PMMC (Permanent Magnet Moving Coil) instrument using torque equation.
or
(b) Given readings: 41.7, 42.0, 41.7, 42.0, 42.1, 41.6, 42.0, 41.9, 42.5, 41.8

Calculate:
(i) Arithmetic mean                                             (ii) Standard deviation
(iii) Probable error of one reading                      (iv) Probable error of mean
(v) Range

Question 4

(a) List and explain types of probes used in measurement with circuit diagrams.
or
(b) Explain AC electronic voltmeter circuits with diagrams.

Question 5

(a) Derive the Maxwell Bridge equation and solve for LLL, RRR, and Q factor when
C3=0.1μF,R1=1.26kΩ,R3=470Ω,R4=500Ω,f=100HzC_3 = 0.1 \mu F, R_1 = 1.26 kΩ, R_3 = 470 Ω, R_4 = 500 Ω, f = 100 HzC3​=0.1μF,R1​=1.26kΩ,R3​=470Ω,R4​=500Ω,f=100Hz.
or
(b) Explain Kelvin Double Bridge method for measuring low resistance and derive its balance condition.

Question 6

(a) Explain the working principle, block diagram, and waveform of a Sampling Oscilloscope.
or
(b) Draw and explain Dual Trace Oscilloscope with its block and waveform diagrams.

Question 7

(a) What is a Transducer? Explain types of transducers used in measurement.
or
(b) Explain Thermocouples and their types with applications.