Instrumentation

Instrumentation BITS

1.     What are the desirable characteristics of measurement systems?

2.     What is the order of input resistance of a cathode ray oscilloscope?

3.     What is a quantity whose magnitude has a definite repeating time cycle called?

4.     What is the source of electrons in a CRT?

5.      Where is the focusing anode located in a CRT?

6.     What is purpose of an aquadag?

7.     What is a electron gun?

8.      What is the principle factor in determining the sensitivity and bandwidth of oscilloscope?

9.     What is a lissajious pattern? 

10.                         What are the different types of CRO probes?

11.                        Mention different fields of applications of wave analyzers

12.                        Name some force summing devices

13.                        . What are types of flow rate meters?

14.                        What is a electrical transducer?

15.                          What is the other name of an active transducer?

16.                          What is a potential divider?

17.                         What is piezo-resistive effect?

18.                        Why foil type gauges have much greater heat dissipation capacity?

19.                        What is a rosette?

20.                         A photo-voltaic cell is also called known as?

21.                        Give an example for the active transducer?

22.                         What are the considerations while selecting a transducer for a particular application?

23.                        What is a positive temperature coefficient of resistance?

24.                        Name different forms of thermistors .

25.                         What happens when the core is at its null position in an LVDT?

26.                        Give the classification of resolvers.

27.                        Define gauge factor.

28.                        What happens when a tensile strain is applied in a semi-conductor strai gauge?

29.                        Which type of construction is used for rotor in a synchro-transmitter?

30.             Which photo electric transducer is used for production of                           electric energy by converting solar energy?

31.                        What is a modem?

32.                        What are the types of deflection type wheatstone bridge?

33.                        What is helipot?

34.                        Give the gauge factor equation for strain gauge.

35.                        Which instrument is used measure the electrical activity of the heart?

36.                        Which modulation telemetering system has maximum immunity to noise?

37.                        Hoop stresses acts in which direction?

38.                        What is the output voltage of a drag-cup type ac tachometer?

39.                        What is a temperature range of radiation pyrometer?

40.                        What are the generalized elements of measuring instruments?

41.                        What is hysterisis loss?

42.                        Classify the modulation techniques.

43.                        Classify discrete time signals.

44.                        What is varience?

45.                        What is harmonic distortion and classify.

46.                        Define spectral analyzers.

47.                        What is the use of vector impedance meter?

48.                        What is a Q meter?

49.                        Explain about loading error in case of pot.

50.                        Give examples of inverse transducers.

J.B.INSTITUTE OF ENGINEERING & TECHNOLOGY

III/IV, II-Sem (EEE), Instrumentation KEY

1.     Accuracy,sensitivity and reproducibility

2.     mega ohm

3.     steady state periodic

4.     A barium and strontium oxide coated cathode

5.     between pre-accelerating and accelerating anode

6.     To collect the secondary emission electrons

7.     The source of focused and accelerated electron beam is the electron gun

8.     Vertical amplifier

9.     A pattern that appears when sinusoidal waveforms are simultaneously applied to horizontal and vertical plates

10.               Direct probe, circuit isolation probe, detector probe

11.               . electrical, sound, vibration measurement

12.               Bellows, flat diaphragm, corrugated diaphragm, bourdon tube

13.               inferential meters, absolute or positive displacement meters

14.                whose output is electrical in nature

15.               Self generating type

16.               a device for dividing the potential in a ratio determined by the position of the sliding contact

17.               There is a change in the value of resistivity of the conductor when it is strained

18.               on account of their larger surface area

19.               A combination of strain gauges

20.               solar cell

21.               Photo-voltaic cell, thermocouple

22.               input, output and transfer characteristics

23.               which exhibit an increase in the value of resistance with increase in temperature

24.               bead, probe, disc, rod

25.               flux linking with both primary and secondary windings are equal hence induced emf’s are equal.

26.               ratio of change in resistance to change in length

27.               computing resolvers and synchro resolvers

28.               resistance increase in P-type materials

29.               Salient pole type of construction

30.               Photo diode and photo transistor

31.               An acronym of modulation and demodulation

32.               Voltage sensitive and current sensitive bridge

33.               it’s a combination both translatory and rotational potentiometers

34.               1+2µ+(∆l/l)/(∆R/R)

35.               electrocardiograph

36.               pulse code

37.               radial direction

38.               modulated waveform

39.               1200 to 2500degc

40.               detector, an intermediate transfer device and an indicator or storage device

41.               it is a phenomena when loading effect is not equal to the  unloading effect

42.               They are classified into amplitude, frequency, phase modulations

43.               Step, ramp, parabolic and impulse signals

44.               it is mean square deviation

45.               distortion is a result of the inherent non-linear characteristics of differenent components used in electronic circuits

types: phase,frequency,amplitude,intermodulation,crossover distortions

46.               the study of energy distribution across the frequency spectrum of a given electrical signal

47.               it is used to measure the phase angle and frequency

48.               used to measure the quality factor of electrical coils

49.               the effect of impedence of the input device which is connected to the output of the pot

50.               voltmeter,ammeter and piezo-electric transducer