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Reliance-Energy-REL - Model Placement Paper
Technical Questions(Instrumentation):
1. 1 gm/cc = ____kg/m3.
2. 1 atm = ___kg/cm2.
3. what range of pressure used in pneumatic systems(ans: 3-15 psi).
4. what type of orifice used for gas-liquid mixture flow: concentric/segmental/eccentric.
5. Given PB of 60%,70%,80%,90%, which one is the most sensitive?
6. Integral orifice is used for low/medium/high flow applications.
7. Which of the following is a variable area type flow meter(ans: rotameter).
8. For a 36â dia gas pipeline which of the following flowmeter is used: orifice/annubar/target flow meter.
9. A compressor should be operated above/on/near the surge line.
10.For measuring γ-ray radioactivity what would you use: scintillation counter/cathode ray tube/all of the above.
11. In cascade control ___ of the primary controller is the___ of the secondary controller.
12. For derivative control step input gives ___ output.
13. Demorganâs law is useful bcoz it converts NOR to NAND/NOR to AND/etc.
14. NAND is called a universal gate bcoz..
15. RS-485 can be used for multidrop communication: true/false.
16. Which of the following is a high-temp O2 analyser: zirconia/paramagnetic/radiation/etc.
17. A question on gas chromatography which I canât recollect.
18. Given a ckt find out the current in a particular branch.
19. Zener barrier is used to: limit input current/limit input current coming from field/limit energy going to field.
20. Which of the following is type K thermocouple: copper constantan/iron constantan/ Pt rhodium/ chromel alumel.
21. For measuring 1200°C what thermocouple would you use: K/J/E/R.
22. Full form of MIMS as used with thermocouples.
23. Relation between flow rate and ÎP(ans: Q a ÃÎP)
24. Problem using the above relation.
25. What can be used to detect combinational hazards in circuits: truth table/K-map/sequence table.
26.If a chip containing a RAM has power switched off and then on, then data in the RAM is irretrievably lost/data is retained/data is retained with minor modifications/chip is damaged.
27. Iif a 20 MHz wave is fed into a cascade of mod-10,mod-5 and mod-4 counters the lowest o/p freq obtainable is___.
28. For a tank containing water to a ht. of 2m pressure at the bottom in kg/cm² is____.
29. For noise reduction what can be connected across the P.S. pins of an IC: resistor/capacitor/diode/transistor.
30. The no. of o/p states in a 4-bit ADC.
31. If the previous state in a 4-bit up/down counter is 1111, the next state will be___.
32. Advantage of double seated control valve.
33. Which of the following types of CV has tight shut-off: III/IV/V/VI.
34. Ratio of maxm. to minm. Controllable flow of a CV is called___.
35. Which of these is not a CV characteristic: quick opening/linear/modified parabolic/equal %.
36. An I/P converter converts analog to pneumatic/analog to digital/digital to pneumatic.
37.The commonly used range of analog current signal is___.
38. Full form of CMOS.
39.Which of these is required for calibration: calibrating equipment/controlled environmental conditions/competent personnel/traceability of standards/all of the above.
40. Glycerine filled gauges are used for prevention of corrosion/pulsation/some other option/all of these.
41. Full form of TCP/IP.
42. Which of the following is insensitive to noise: optical fibre/twisted pair/coaxial cable.
43. Maxm cable length in RS-232C: 50m/100m/150m/200m.
44.Which of the foll cannot be used to generate square waves: astable/monostable/bistable/bootstrapping ckt.
45. Advantage of floating power supply
46.For flow control loop what can be used: PID/PI/P control.
47. Capacitor energy equation(ans: W=½CV²).
48. Given an 8-bit string identify which does not have even parity.
49. What is done in a flapper-nozzle amplifier.
50.Dead weight tester operates on which principle (ans: pascalâs law).
