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.
| 351. |
_ Pyrometry refers to the measurement of temperature$? |
| A. | With the mercurial thermometer upto 350°C |
| B. | Directly |
| C. | Which is of higher magnitude |
| D. | All of the above |
| Answer» D. All of the above | |
| 352. |
_ The transfer function of a process is 1/(16s² + 8s + 4). If a step change is introduced into the system, then the response will be$? |
| A. | Under damped |
| B. | Critically damped |
| C. | Over damped |
| D. | None of these |
| Answer» B. Critically damped | |
| 353. |
_ Process degree of freedom indicates __________ number of controllers to be used.$? |
| A. | The maximum |
| B. | The minimum |
| C. | Both maximum and the minimum |
| D. | Nothing about the |
| Answer» B. The minimum | |
| 354. |
_ Which of the following thermocouples is capable of measuring a temperature of -50°C?$? |
| A. | Platinum - platinum + rhodium |
| B. | Chromel - alumel |
| C. | Iron-constantan |
| D. | Copper - constantan |
| Answer» B. Chromel - alumel | |
| 355. |
_ Use of I-control along with P-control facilitates$? |
| A. | Elimination of offset |
| B. | Reduction of offset |
| C. | Reduction of stability time |
| D. | None of these |
| Answer» B. Reduction of offset | |
| 356. |
_ Which of the following judges the accuracy of an instrument?$? |
| A. | Dead zone |
| B. | Drift |
| C. | Static error |
| D. | None of these |
| Answer» D. None of these | |
| 357. |
_ Liquid levels in autocalves are measued by$? |
| A. | Simple float |
| B. | Differential float type manometer |
| C. | Glass gauge |
| D. | None of these |
| Answer» C. Glass gauge | |
| 358. |
_ Liquid discharge from a tank or reservoir can not be measured by$? |
| A. | Orificemeters |
| B. | Weirs |
| C. | Mouthpieces |
| D. | Notches |
| Answer» B. Weirs | |
| 359. |
_ Flow rate of sludge is not measured by a/an$? |
| A. | Orificemeter |
| B. | Open weir |
| C. | Kennison nozzle |
| D. | Both B & C |
| Answer» E. | |
| 360. |
_ Pick out the first order system from among the following.$? |
| A. | Damped vibrator |
| B. | Mercury in glass thermometer kept in boiling water |
| C. | Interacting system of two tanks in series |
| D. | Non-interacting system of two tanks in series |
| Answer» C. Interacting system of two tanks in series | |
| 361. |
_ Dome temperature of blast furnace stove is most accurately measured by a$? |
| A. | Radiation pyrometer |
| B. | Platinum-platinum/rhodium ther-mocuple |
| C. | Iron-constantan thermocouple |
| D. | Platinum resistance thermometer |
| Answer» C. Iron-constantan thermocouple | |
| 362. |
_ The open loop transfer function of a control system is KR/(1 + TS) . This represents$? |
| A. | A first order system |
| B. | Dead time system |
| C. | A first order time lag |
| D. | A second order system |
| Answer» B. Dead time system | |
| 363. |
_ Very low pressure is expressed in microns(μ), which is equal to __________ mm of Hg coloumn (absolute) at 0°C.$? |
| A. | 0.0001 |
| B. | 0.001 |
| C. | 0.01 |
| D. | 0.1 |
| Answer» C. 0.01 | |
| 364. |
_ Flow rate measurement of hostile acids and alkalis can be most suitably done by a/an$? |
| A. | Venturimeter |
| B. | Orificemeter |
| C. | Magnetic flow meter |
| D. | Hot wire anemometer |
| Answer» D. Hot wire anemometer | |
| 365. |
_ For an input forcing function, X(t) = 2t², the Laplace transform of this function is$? |
| A. | 2/s² |
| B. | 4/s² |
| C. | 2/s³ |
| D. | 4/s³ |
| Answer» E. | |
| 366. |
_ Which of the following controllers has the least maximum deviation?$? |
| A. | P-controller |
| B. | P-I controller |
| C. | P-I-D controller |
| D. | P-D controller |
| Answer» E. | |
| 367. |
_ Thermal well made of __________ gives the fastest speed of response, while measuring temperature by thermocouples.$? |
| A. | Steel |
| B. | Vycor (a glass) |
| C. | Nichrome |
| D. | Inconel |
| Answer» C. Nichrome | |
| 368. |
_ Liquid column manometers are used for measuring the pressure __________ kgf/cm² .$? |
| A. | > 2(gage) |
| B. | < 3 (gage) |
| C. | < 10 (gage) |
| D. | < atmospheric |
| Answer» C. < 10 (gage) | |
| 369. |
_ The temperature of tempering oil baths maintained at 400°C during heat treatment of steel is measured by a/an __________ thermocouple.$? |
| A. | Chromel-alumel |
| B. | Iron-constantan |
| C. | Platinum-platinum/rhodium |
| D. | None of these |
| Answer» C. Platinum-platinum/rhodium | |
| 370. |
_ Zirconia probe is used for the continuous measurment of __________ flue gases going out of the furnace.$? |
| A. | Oxygen in |
| B. | Carbon dioxide in |
| C. | Carbon monoxide in |
| D. | Temperature of |
| Answer» B. Carbon dioxide in | |
| 371. |
_ A stable system is the one$? |
| A. | For which the output response is bounded for all bounded input |
| B. | Which exhibits an unbounded response to a bounded input |
| C. | Which satisfies the conditions for a servo problem |
| D. | None of these |
| Answer» B. Which exhibits an unbounded response to a bounded input | |
| 372. |
_ The second order system with the transfer function 4/(S² + 2S + 4) has a damping ratio of$? |
| A. | 2.0 |
| B. | 0.5 |
| C. | 1.0 |
| D. | 4.0 |
| Answer» C. 1.0 | |
| 373. |
_ Characteristic equation is the denominator of __________ loop transfer function.$? |
| A. | Open |
| B. | Closed |
| C. | Both A & B |
| D. | Neither A nor B |
| Answer» C. Both A & B | |
| 374. |
_ Temperature measurement range of iron-constantan thermocouple is 0 to 870°C. It can be used to measure sub zero temperature, because at lower temperature$? |
| A. | Emf produced is very low of the order of microvolt |
| B. | Embrittlement of iron occurs |
| C. | Rusting of iron takes place |
| D. | Both B and C |
| Answer» E. | |
| 375. |
__The offset introduced by proportional controller with gain Kc in response of first order system can be reduced by__ |
| A. | Reducing value of Kc |
| B. | Introducing integral control |
| C. | Introducing derivative control |
| D. | None of the above |
| Answer» C. Introducing derivative control | |
| 376. |
__The frequency response of a first order system, has a phase shift with lower and upper bounds given by__ |
| A. | - ‚à û, œÄ/2 |
| B. | -π/2, π/2 |
| C. | -π/2, 0 |
| D. | 0, π/2 |
| Answer» E. | |
| 377. |
__Temperature of __________ can not be measured by an optical or radiation pyrometer.__ |
| A. | Hot blast (air) from stoves |
| B. | Molten slag flowing out of blast furnace |
| C. | Combustion space in boilers |
| D. | Rotary limestone calcination kiln |
| Answer» B. Molten slag flowing out of blast furnace | |
| 378. |
__Number of poles in a system with transfer function 1/(s² + 2s² + 1) is__ |
| A. | 2 |
| B. | 5 |
| C. | 3 |
| D. | 1 |
| Answer» D. 1 | |
| 379. |
__A first order system with a time constant of 1 min is subjected to frequency response analysis. At an input frequency of 1 radian/min, the phase shift is__ |
| A. | 45° |
| B. | -90° |
| C. | -180° |
| D. | -45° |
| Answer» E. | |
| 380. |
__Thermistors are used in __________ devices.__ |
| A. | Voltage measuring |
| B. | Temperature measuring |
| C. | Temperature compensating |
| D. | Both B & C |
| Answer» E. | |
| 381. |
__Polarisation of light forms the working principle of a__ |
| A. | Polarimeter |
| B. | Polarograph |
| C. | Chromatograph |
| D. | Spectrometer |
| Answer» B. Polarograph | |
| 382. |
__Phase lag of the sinusoidal response of a first order system is__ |
| A. | 120° |
| B. | 30° |
| C. | 180° |
| D. | 90° |
| Answer» E. | |
| 383. |
__Which of the following can measure temperatures in the range of - 20 to 300°C ?__ |
| A. | Mercury in glass thermometer |
| B. | Vapor pressure thermometer |
| C. | Resistance thermometer |
| D. | None of these |
| Answer» E. | |
| 384. |
__In a single tank system, the transfer function of level to inlet flow rate is__ |
| A. | R/TS |
| B. | R/(TS + 1) |
| C. | L(TS + l) |
| D. | 1/TS |
| Answer» C. L(TS + l) | |
| 385. |
__In a closed loop system, the process to be controlled is an integrating process with transfer function l/2s. The controller proposed to be used in an integral controller with transfer function 1/T‚ÇÅs. When a step change in set point is applied to such a closed loop system, the controlled variable will exhibit__ |
| A. | Overdamped response |
| B. | Underdamped response |
| C. | Undamped response |
| D. | Unstable response |
| Answer» C. Undamped response | |
| 386. |
__In Bode plot, A.R. vs. w is plotted on a/an __________ graph paper.__ |
| A. | Log-lag |
| B. | Triangular |
| C. | Ordinary |
| D. | Semi-log |
| Answer» B. Triangular | |
| 387. |
_Specific gravity of a liquid can not be measured by a/an$? |
| A. | Anemometer |
| B. | Specific gravity bottle |
| C. | Pycnometer |
| D. | Hydrometer |
| Answer» B. Specific gravity bottle | |
| 388. |
_A bimetallic thermometer as compared to industrial mercury in glass thermometer has almost the same$? |
| A. | Temperature measuring range (- 40°C to 450°C) |
| B. | Accuracy (± 1% of span) |
| C. | Speed of response |
| D. | All of the above |
| Answer» E. | |
| 389. |
_In a shell and tube heat exchanger, the outlet temperature of heating/cooling fluid is the __________ variable.$? |
| A. | Load |
| B. | Manipulated |
| C. | Controlled |
| D. | None of these |
| Answer» D. None of these | |
| 390. |
_Flapper nozzle is used in a/an __________ controller.$? |
| A. | Electronic |
| B. | Hydraulic |
| C. | Pneumatic |
| D. | None of these |
| Answer» D. None of these | |
| 391. |
_Pirani gauge is used for the measurement of$? |
| A. | Very high pressure |
| B. | High vacuum |
| C. | Liquid level under pressure |
| D. | Liquid level at atmospheric pressure |
| Answer» C. Liquid level under pressure | |
| 392. |
_The operation of a rotameter is based on$? |
| A. | Variable flow area |
| B. | Rotation of a turbine |
| C. | Pressure drop across a nozzle |
| D. | Pressure at a stagnation point |
| Answer» B. Rotation of a turbine | |
| 393. |
_The frequency at which maximum amplitude ratio is attained is called the __________ frequency.$? |
| A. | Corner |
| B. | Resonant |
| C. | Cross-over |
| D. | Natural |
| Answer» C. Cross-over | |
| 394. |
_The time constant of a first order process with resistance R and capacitance C is$? |
| A. | R + C |
| B. | R - C |
| C. | RC |
| D. | 1/RC |
| Answer» D. 1/RC | |
| 395. |
_Flow rate of those fluids which are insensitive to changes in their density, viscosity or flow velocity profile can be best measured by a$? |
| A. | Magnetic flowmeter |
| B. | Pitot tube |
| C. | Flow nozzle type flowmeter |
| D. | Turbine flowmeter |
| Answer» B. Pitot tube | |
| 396. |
_Configuration of Bourdon spring tube is never made of __________ shape.$? |
| A. | Circular |
| B. | Semi-circular |
| C. | Helical |
| D. | Spiral |
| Answer» B. Semi-circular | |
| 397. |
_A sinusoidal variation in the input passing through a linear first order system$? |
| A. | Becomes more oscillatory (frequency increases) |
| B. | Becomes less oscillatory (frequency decreases) |
| C. | Gets amplified (magnitude increases) |
| D. | Gets attenuated (magnitude decreases) |
| Answer» E. | |
| 398. |
_E.m.f. generated by thermocouples is of the order of$? |
| A. | Millivolts |
| B. | Microvolts |
| C. | Volts |
| D. | Kilo volts |
| Answer» B. Microvolts | |
| 399. |
_According to Bode stability criterian, a system is unstable, if the open loop frequency response exhibits an amplitude ratio exceeding unity at frequency for which phase lag is$? |
| A. | 0° |
| B. | 45° |
| C. | 90° |
| D. | 180° |
| Answer» E. | |
| 400. |
_Specific conductance is defined as the reciprocal of resistance in ohms of 1c.c. of liquid at a specified temperature. Its value for distilled water is about __________ micro mho/cm³.$? |
| A. | 50 |
| B. | 100 |
| C. | 10 |
| D. | 1 |
| Answer» E. | |