Maharashtra State Board of Technical Education 2011-4th Sem Diploma Electronics Engineering (DEE) for in Electronics EngineeringSubject :- electronics instruments and measurements(12117) -
MSBTE ques. paper for Diploma in Electronics Engineering
Fourth Semester
Subject :- electronics instruments and measurements(12117)
Instructions : (1) All questions are compulsory.
Seat No.
21011
3 Hours/100 Marks
(2) Answer each next main question on a new page.
(3) Illustrate your answers with neat sketches wherever necessary.
(4) Figures to the right indicate full marks.
(5) Assume suitable data, if necessary.
(6) Use of Non-programmable Electronic Pocket Calculator is permissible.
(7) Mobile Phone, Pager and any other Electronic Communication devices are not permissible in Examination Hall.
Marks
1. A) Attempt any six of the following :
12
i) List out any two static characteristics and any two dynamic characteristics of instrument.
ii) What is error ? State formula for percentage error.
iii) Define the term Resolution' and Sensitivity.
iv) Which components are used for electrostatic deflection in CRO ?
v) What is drift ? How to minimise drift ?
vi) State classification of analog instrument based on pointer deflection system.
vii) Define the term voltmeter sensitivity of analog voltmeter.
viii) Define the term standard. State types of standard.
Marks
12117 -2-
B) Attempt any two of the following : 8
i) Which are different types of error ? List out their sources.
ii) How basic analog DC ammeter operates ? With proper example justify its range extension method.
iii) Compare four standards on the basis of following factors :
i) Calibration
ii) Accuracy
iii) Use
iv) Maintain by.
2. Attempt any four of the following : 16
a) With neat sketch explain working principle of PMMC. State the role of mirror used in analog instruments.
b) Sketch block diagram of digital frequency meter. State the function of schmitt trigger in DFM.
c) What is ADC ? Which are types of ADC ? List out any four applications of ADC.
d) State any eight specifications of DMM.
e) Sketch neat labelled block diagram of single slope type DVM. State functions of input comparator, ground comparator, gate and CLK generator blocks of DVM.
f) With reference to sine wave state the meaning and mathematical formula for peak value, average value and RMS value. Which type of reading is obtained from rectifier type analog AC voltmeter ?
3. Attempt any four of the following : 16
a) State role of oscillator in LCR-Q meter. With neat sketch explain how Q of a coil is measured.
b) Sketch neat labelled block diagram of basic CRO. State function of time base generator used in CRO.
c) How electron beam is obtained in CRT ? Sketch constructional diagram of CRT. List out properties of material used for screen coating.
d) State the meaning of time domain and frequency domain instruments. State two examples of each type.
e) Sketch block diagram of RF signal generator. Which types of signals can be obtained from RF generator ?
f) List out any eight specifications of function generator.
4. Attempt any four of the following : 16
a) Sketch labelled block diagram of spectrum analyser. Sketch output display of spectrum analyser if input is AM-DSB (Amplitude modulated) signal.
b) Sketch labelled block diagram of successive approximation type of DVM. State its any two advantages.
c) What is logic analyser ? Where it is used ? List out any four features of logic analyser.
d) Sketch neat labelled block diagram of function generator. State function of diode wave shaping circuit.
e) With example state the meaning of resolution and sensitivity of digital display.
< 1 1 In 4 digit digital display state the significance ot digit.
5. Attempt any two of the following : 16
a) State the procedure for measurement of following parameter using CRO
i) Frequency
ii) Phase angle Sketch suitable diagram.
b) Sketch neat labelled block diagram of digital LCR meter. Slate functions of all blocks. What is four wire measurement technique ?
c) What is AF signal generator ? Sketch block diagram of AF signal generator. Explain its working and state front panel controls of AF signal generator.
Marks
12117
-4-
6. Attempt any four of the following :
16
a) Compare analog and digital multimeter on the basis of
i> Display
ii) Resolution
iii) Functions available
iv) Power consumption.
b) With example explain range extension for analog D.C. voltmeter.
c) List out any eight specifications of CRO.
d) What is storage CRO ? Which are type of storage CRO ? Which are additional blocks required in DSO as compare to normal CRO ?
e) List out various blocks of vertical deflection subsystem and state their functions. 0 State types of CRO probe. How current probe operates ?
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| Earning: Approval pending. |
