MCQOPTIONS
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MCQOPTIONS
This section includes 830 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 251. |
*$_Continuous measurement of moisture in paper is done by? |
| A. | Sling psychrometer |
| B. | Hair-hygrometer |
| C. | Weighing |
| D. | High resistance Wheatstone's bridge circuit |
| Answer» E. | |
| 252. |
*$_Pick out the one which is a first order instrument.? |
| A. | Mercury in glass thermometer (without any covering or air gap) |
| B. | Bare metallic thermometer |
| C. | Bare vapor pressure thermometer |
| D. | All of the above |
| Answer» E. | |
| 253. |
*$_The __________ of the fluid contained in the temperature sensing element (i.e., bulb) of filled system thermometers changes with change in temperature.? |
| A. | Pressure |
| B. | Volume |
| C. | Viscosity |
| D. | All of the above |
| Answer» E. | |
| 254. |
*$_Reference points i.e., ice point and steam point in Reaumer temperature scale are respectively? |
| A. | - 273° & 80° |
| B. | 0° & 80° |
| C. | 32° & 460° |
| D. | 32° & 80° |
| Answer» C. 32¬¨‚àû & 460¬¨‚àû | |
| 255. |
*$_Small furnace draught is accurately measured by an inclined tube manometer, in which the manometric liquid used most commonly is? |
| A. | Water |
| B. | Carbon tetrachloride |
| C. | Paraffin |
| D. | Ethylene glycol |
| Answer» D. Ethylene glycol | |
| 256. |
*$_Dilatometer is used to measure? |
| A. | Stress |
| B. | Strain |
| C. | Deflection |
| D. | Contraction/expansion due to changes in temperature |
| Answer» E. | |
| 257. |
*$_What is the Laplace transform of sin t ?? |
| A. | 1/(s² + 1) |
| B. | S/(s² + 1) |
| C. | 1/(s² - 1) |
| D. | S/(s² - 1) |
| Answer» B. S/(s¬¨‚⧠+ 1) | |
| 258. |
*$_Which of the following shows maximum dip effect (indicating reverse direction of temperature change)?? |
| A. | Mercury thermometer |
| B. | Radiation pyrometer |
| C. | Bimetallic thermometer |
| D. | Thermocouple |
| Answer» B. Radiation pyrometer | |
| 259. |
*$_In an exothermic chemical reactor, the manipulated variable is the flow rate of? |
| A. | Coolant |
| B. | Reactants |
| C. | Product |
| D. | None of these |
| Answer» B. Reactants | |
| 260. |
*$_Mercury thermometer can be used to measure the temperature upto __________ °C.? |
| A. | 100 |
| B. | 250 |
| C. | 350 |
| D. | 750 |
| Answer» D. 750 | |
| 261. |
*$_Range of hydrogen gas constant volume themometer is __________ °C.? |
| A. | -10 to 20 |
| B. | 0 to 100 |
| C. | 100 - 500 |
| D. | 400 - 1000 |
| Answer» C. 100 - 500 | |
| 262. |
*$_Liquid flow rate in an open channel can not be measured by a/an? |
| A. | Orifice meter |
| B. | Cipolletti weir |
| C. | Rectangular weir |
| D. | V-notch |
| Answer» B. Cipolletti weir | |
| 263. |
*/*_Degree to which an instrument indicates the changes in measured variable without dynamic error is called its? |
| A. | Speed of response |
| B. | Reproducibility |
| C. | Fidielity |
| D. | Static characteristics |
| Answer» D. Static characteristics | |
| 264. |
*/*_Feed forward controller accounts for the __________ changes.? |
| A. | Set point |
| B. | Load |
| C. | Both A & B |
| D. | Neither A nor B |
| Answer» C. Both A & B | |
| 265. |
*/*_Which of the following is never used as an element of industrial resistance thermometer?? |
| A. | Lead |
| B. | Nickel |
| C. | Copper |
| D. | 30% iron + 70% nickel |
| Answer» B. Nickel | |
| 266. |
*/*_Suppose that the gain, time constant and dead time of a process with the following transfer function:Gc(s) = 10 exp( - 0.1s)/(0.5s + 1) are known with a possible error of ± 20% of their values. The largest permissible gain Kc of a proportional controller needs to be calculated below taking the values of process gain, time constant and dead time as? |
| A. | 8, 0.6, 0.08 |
| B. | 12, 0.6, 0.12 |
| C. | 8, 0.6, 0.12 |
| D. | 12, 0.4, 0.08 |
| Answer» C. 8, 0.6, 0.12 | |
| 267. |
*/*_For measuring the temperature of a red hot furnace, which is the most suitable instrument?? |
| A. | Platinum resistance thermometer |
| B. | Thermocouple |
| C. | Optical pyrometer |
| D. | Bimetallic thermometer |
| Answer» D. Bimetallic thermometer | |
| 268. |
*/*_Which of the following thermocouples has the least temperature measurement range?? |
| A. | Copper-constantan |
| B. | Chromel-alumel |
| C. | Platinum-platinum/rhodium |
| D. | Iron-constantan |
| Answer» B. Chromel-alumel | |
| 269. |
*/*_Bimetal strips are not used in? |
| A. | Bimetallic thermometers |
| B. | Thermocouples |
| C. | Thermostats |
| D. | Relays for opening & closing of electrical circuits |
| Answer» C. Thermostats | |
| 270. |
*/*_Which of the following is not a variable area flow meter?? |
| A. | Piston type meter |
| B. | Rotameter |
| C. | Magnetic flow meter |
| D. | Orifice and tapered plug meter |
| Answer» D. Orifice and tapered plug meter | |
| 271. |
*/*_Positioning controllers are used for? |
| A. | Low loads |
| B. | Temperature changes |
| C. | High loads |
| D. | Flow rate changes |
| Answer» D. Flow rate changes | |
| 272. |
*/*_In a shell and tube heat exchanger, the inlet temperature of heating/cooling fluid is the __________ variable.? |
| A. | Load |
| B. | Manipulated |
| C. | Controlled |
| D. | None of these |
| Answer» B. Manipulated | |
| 273. |
*/*___________ stability method uses open loop transfer function.? |
| A. | Nyquist |
| B. | Mikhalov |
| C. | Ruth |
| D. | None of these |
| Answer» B. Mikhalov | |
| 274. |
*/*_Thermal conductivity measurement com-prises the working principle of a? |
| A. | CO‚ÇÇ analyser |
| B. | Polarimeter |
| C. | Spectrometer |
| D. | Chromatograph |
| Answer» B. Polarimeter | |
| 275. |
*/*_An amplitude ratio of 0.1 corresponds to __________ decibels.? |
| A. | 20 |
| B. | -20 |
| C. | 10 |
| D. | -10 |
| Answer» C. 10 | |
| 276. |
*/*_Non-metallic diaphragm used as pressure sensor in instruments is generally made of? |
| A. | Teflon |
| B. | Synthetic rubber |
| C. | Bakelite |
| D. | Thick paper |
| Answer» C. Bakelite | |
| 277. |
*/*_A mercury barometer measures the __________ pressure.? |
| A. | Atmospheric |
| B. | Gauge |
| C. | Vacuum |
| D. | Absolute |
| Answer» B. Gauge | |
| 278. |
*/*_Humidity of air can be determined by a? |
| A. | Chromatograph |
| B. | Sling psychrometer |
| C. | Mass spectrometer |
| D. | Polarimeter |
| Answer» C. Mass spectrometer | |
| 279. |
*/*_A negative gain margin expressed in decibels means a/an __________ system.? |
| A. | Stable |
| B. | Unstable |
| C. | Critically damped |
| D. | None of these |
| Answer» C. Critically damped | |
| 280. |
*/*_Measurement of pressure in ammonia reactor is done by? |
| A. | Bourdon gauge |
| B. | U-tube manometer |
| C. | Inclined tube manometer |
| D. | Pirani guage |
| Answer» B. U-tube manometer | |
| 281. |
*/*_Response of a linear control system for a change in set point is called? |
| A. | Frequency response |
| B. | Transient response |
| C. | Servo problem |
| D. | Regulator problem |
| Answer» D. Regulator problem | |
| 282. |
*/*_Thermal conductivity measurement is used for the determination of? |
| A. | O‚ÇÇ percentage in the flue gas |
| B. | Specific gravity of petrofuels |
| C. | Composition of an alloy |
| D. | CO‚ÇÇ percentage in the flue gas |
| Answer» E. | |
| 283. |
*/*___________ controller has the maximum stabilising time.? |
| A. | P |
| B. | PD |
| C. | PI |
| D. | PID |
| Answer» D. PID | |
| 284. |
*/*_Silver point temperature is __________ °C.? |
| A. | 760.5 |
| B. | 860.5 |
| C. | 960.5 |
| D. | 1060.5 |
| Answer» D. 1060.5 | |
| 285. |
*/*_Select the correct statement from the following.? |
| A. | The frequency response of a pure capacity process is unbounded |
| B. | The phase lag of a pure time delay system decreases with increasing frequency |
| C. | The amplitude ratio of a pure capacity process is inversely proportional to frequency |
| D. | The amplitude ratio of a pure time delay system increases with frequency |
| Answer» D. The amplitude ratio of a pure time delay system increases with frequency | |
| 286. |
*/*___________ are analysed using a polarograph.? |
| A. | Isotonic solutions |
| B. | Solids |
| C. | Liquids |
| D. | Gases |
| Answer» C. Liquids | |
| 287. |
*/*_Which of the following filled system expansion thermometer has the capability to measure the lowest temperature?? |
| A. | Mercury in glass thermometer |
| B. | Mercury in steel thermometer |
| C. | Alcohol in glass thermometer |
| D. | Fused metal (Na or K) in steel thermometer |
| Answer» D. Fused metal (Na or K) in steel thermometer | |
| 288. |
*/*_Which of the following is the dynamic characteristics of an instrument?? |
| A. | Reproducibility |
| B. | Sensitivity |
| C. | Dead zone |
| D. | Fidelity |
| Answer» E. | |
| 289. |
*/*_Liquid argon level in a pressurised storage tank (at 3 kg/cm² ) is measured by a/an? |
| A. | Gage glass |
| B. | External float gage |
| C. | Differential pressure gage |
| D. | None of these |
| Answer» D. None of these | |
| 290. |
*/*_Routh stability method uses __________ loop transfer function.? |
| A. | Open |
| B. | Closed |
| C. | Either A or B |
| D. | Neither A nor B |
| Answer» C. Either A or B | |
| 291. |
*/*_A proportional controller with a gain of Kc is used to control a first order process. The offset will increase, if? |
| A. | Kc is reduced |
| B. | Kc is increased |
| C. | Integral control action is introduced |
| D. | Derivative control action is introduced |
| Answer» C. Integral control action is introduced | |
| 292. |
*/*_Which of the following thermocouples is capable of measuring a temperature of -50°C?? |
| A. | Platinum - platinum + rhodium |
| B. | Chromel - alumel |
| C. | Iron-constantan |
| D. | Copper - constantan |
| Answer» B. Chromel - alumel | |
| 293. |
*/*_Use of I-control along with P-control facilitates? |
| A. | Elimination of offset |
| B. | Reduction of offset |
| C. | Reduction of stability time |
| D. | None of these |
| Answer» B. Reduction of offset | |
| 294. |
*/*_Which of the following judges the accuracy of an instrument?? |
| A. | Dead zone |
| B. | Drift |
| C. | Static error |
| D. | None of these |
| Answer» D. None of these | |
| 295. |
*/*_Process degree of freedom indicates __________ number of controllers to be used.? |
| A. | The maximum |
| B. | The minimum |
| C. | Both maximum and the minimum |
| D. | Nothing about the |
| Answer» B. The minimum | |
| 296. |
*/*_The temperature of tempering oil baths maintained at 400°C during heat treatment of steel is measured by a/an __________ thermocouple.? |
| A. | Chromel-alumel |
| B. | Iron-constantan |
| C. | Platinum-platinum/rhodium |
| D. | None of these |
| Answer» C. Platinum-platinum/rhodium | |
| 297. |
*/*_A barometer measures the __________ pressure.? |
| A. | Absolute |
| B. | Gauge |
| C. | Absolute as well as gauge |
| D. | Dynamic |
| Answer» B. Gauge | |
| 298. |
*/*_Liquid levels in autocalves are measued by? |
| A. | Simple float |
| B. | Differential float type manometer |
| C. | Glass gauge |
| D. | None of these |
| Answer» C. Glass gauge | |
| 299. |
*/*_Liquid discharge from a tank or reservoir can not be measured by? |
| A. | Orificemeters |
| B. | Weirs |
| C. | Mouthpieces |
| D. | Notches |
| Answer» B. Weirs | |
| 300. |
*/*_Flow rate of sludge is not measured by a/an? |
| A. | Orificemeter |
| B. | Open weir |
| C. | Kennison nozzle |
| D. | Both B & C |
| Answer» E. | |