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.
| 401. |
_Dead zone is the$? |
| A. | Same as time constant |
| B. | Same as transportation lag |
| C. | Maximum change in the variable that does not change the reading of the instrument |
| D. | None of these |
| Answer» D. None of these | |
| 402. |
_Pick out the most suitable instrument for measuring temperature in the range of-40 to 425°C.$? |
| A. | Mercury thermometer |
| B. | Bimetallic thermometer |
| C. | Radiation pyrometer |
| D. | None of these |
| Answer» C. Radiation pyrometer | |
| 403. |
_In second order underdamped system,$? |
| A. | Decay ratio = overshoot |
| B. | Decay ratio = (overshoot)² |
| C. | Overshoot increases for increasing damping co-efficient |
| D. | Large damping co-efficient means smaller damping |
| Answer» C. Overshoot increases for increasing damping co-efficient | |
| 404. |
_Mcleoid gauge is used to measure the$? |
| A. | Point velocity |
| B. | Flow rate |
| C. | Vacuum |
| D. | Pressure |
| Answer» D. Pressure | |
| 405. |
_Platinum resistance thermometer is the international standard for temperature measurement between$? |
| A. | Triple point of hydrogen and freezing point of antimony |
| B. | 13.81°K to 903.9°K |
| C. | Both A and B |
| D. | Neither A nor B |
| Answer» D. Neither A nor B | |
| 406. |
_The closed loop pole of a stable second order system could be$? |
| A. | Both real and positive |
| B. | Complex conjugate with positive real parts |
| C. | Both real and negative |
| D. | One real positive and the other real negative |
| Answer» B. Complex conjugate with positive real parts | |
| 407. |
_Which of the following fluid flow measuring devices can measure the largest flow rate?$? |
| A. | V-notch |
| B. | Rotameter |
| C. | Orificemeter |
| D. | Weir |
| Answer» E. | |
| 408. |
_Continuous measurement of moisture content of paper in paper industry is done by measuring the$? |
| A. | Thermal conductivity through the paper |
| B. | Electrical resistance through the paper |
| C. | Magnetic susceptibility |
| D. | None of these |
| Answer» C. Magnetic susceptibility | |
| 409. |
_A pyranometer is an instrument used for measuring the$? |
| A. | Beam radiation |
| B. | Global radiation |
| C. | Bright sunshine period |
| D. | None of these |
| Answer» C. Bright sunshine period | |
| 410. |
_What is the ratio of output amplitude to input amplitude for a sinusoidal forcing function in a first order system?$? |
| A. | 1 |
| B. | >1 |
| C. | < 1 |
| D. | None of these |
| Answer» D. None of these | |
| 411. |
_Thermistors are made of$? |
| A. | Ultra pure metals |
| B. | Metal oxides |
| C. | Iron-copper alloys |
| D. | Nickel-chromium alloys |
| Answer» C. Iron-copper alloys | |
| 412. |
_Reset rate is the another term used for __________ time.$? |
| A. | Dead |
| B. | Integral |
| C. | Derivative |
| D. | None of these |
| Answer» C. Derivative | |
| 413. |
_Magnetic flowmeters are generally not used for the velocity/flow measurement of hydrocarbons due to their$? |
| A. | Low thermal conductivity |
| B. | Low electrical conductivity |
| C. | High viscosity index |
| D. | Low flash point |
| Answer» C. High viscosity index | |
| 414. |
_Thermal wells used in temperature measurements should have$? |
| A. | Very thick walls |
| B. | Low emissivity |
| C. | Polished surface |
| D. | High transmissivity of radiation |
| Answer» E. | |
| 415. |
_A manometer measures the __________ pressure.$? |
| A. | Atmospheric |
| B. | Absolute |
| C. | Gauge |
| D. | None of these |
| Answer» D. None of these | |
| 416. |
_A system with a double pole at the origin is unstable since the corresponding term in the time domain$? |
| A. | Is a constant |
| B. | Grows exponentially with time |
| C. | Grows linearly with time |
| D. | Decays linearly with time |
| Answer» D. Decays linearly with time | |
| 417. |
_Typical specifications for design stipulates the gain margin and phase margin to be respectively$? |
| A. | > 1.7 and > 30° |
| B. | < 1.7 and > 30° |
| C. | < 1.7 and < 30° |
| D. | > 1.7 and < 30° |
| Answer» B. < 1.7 and > 30¬¨‚àû | |
| 418. |
_Radiation pyrometers as compared to thermocouples$? |
| A. | Has a slower speed of response |
| B. | Can measure higher temperature |
| C. | Can't measure the temperature of moving objects |
| D. | Is more affected by corrosive atmosphere |
| Answer» C. Can't measure the temperature of moving objects | |
| 419. |
_The fluid used in hydraulic controller is$? |
| A. | Water |
| B. | Steam |
| C. | Air |
| D. | Oil |
| Answer» E. | |
| 420. |
_A simple pitot tube measures the$? |
| A. | Average velocity |
| B. | Maximum velocity |
| C. | Point velocity |
| D. | Static pressure |
| Answer» E. | |
| 421. |
_Thermistor, which has high temperature co-efficient of resistivity, is used as the sensing element in resistance thermometer. It is a/an$? |
| A. | Insulator |
| B. | Conductor |
| C. | Solid semi-conductor |
| D. | Liquid semi-conductor |
| Answer» D. Liquid semi-conductor | |
| 422. |
_Which of the following thermocouples can measure the maximum temperature?$? |
| A. | Platinum-rhodium |
| B. | Tungsten-molybdenum |
| C. | Chromel-alumel |
| D. | Iron-constantan |
| Answer» C. Chromel-alumel | |
| 423. |
Pressure of 0.01 psi (absolute) can be measured by __________ gauge.$? |
| A. | Ionisation |
| B. | Pirani |
| C. | Mcloid |
| D. | None of these |
| Answer» D. None of these | |
| 424. |
An emf of the order of mV is generated when two solutions of different hydrogen ion concentration are separated by a thin glass wall. This is the working principle of a$? |
| A. | PH meter |
| B. | Polarimeter |
| C. | Chromatograph |
| D. | Polarograph |
| Answer» B. Polarimeter | |
| 425. |
The inverse Laplace transform of the function f(s) = 1/S(1 + S) is$? |
| A. | 1 + et |
| B. | 1 - et |
| C. | 1 + e-t |
| D. | 1 - e-t |
| Answer» E. | |
| 426. |
Operating range of a temperature measuring instrument is 800 to 1600°C. It could be a/an __________ pyrometer.$? |
| A. | Radiation |
| B. | Optical |
| C. | Photoelectric |
| D. | None of these |
| Answer» D. None of these | |
| 427. |
Which of the systems having following transfer functions is stable?$? |
| A. | 1/(s²+ 2) |
| B. | 1/(s²-2s + 3) |
| C. | 1/(s² + 2s + 2) |
| D. | Exp(-20s)/(s² + 2s-l) |
| Answer» D. Exp(-20s)/(s¬¨‚⧠+ 2s-l) | |
| 428. |
The time constant of a unity gain, first order plus time delay process is 5 min. If the phase lag at a frequency of 0.2 rad/min is 60°, then the dead time (in minutes) is$? |
| A. | 5π/12 |
| B. | π/6 |
| C. | π/12 |
| D. | π/3 |
| Answer» B. ≈ì√Ñ/6 | |
| 429. |
The unit of 'time constant' of a system is the same as that of$? |
| A. | Velocity |
| B. | Time |
| C. | (time)⁻¹ |
| D. | None of these |
| Answer» C. (time)‚Äö√Ö¬™¬¨œÄ | |
| 430. |
Instrumentation in a plant offers the advantage of$? |
| A. | Greater safety of operation |
| B. | Better quality of product |
| C. | Greater operation economy |
| D. | All of the above |
| Answer» E. | |
| 431. |
Which of the following is not classified as a thermo electric pyrometer?$? |
| A. | Resistance thermometer |
| B. | Thermocouple |
| C. | Optical pyrometer (disappearing filament type) |
| D. | Radiation pyrometer |
| Answer» D. Radiation pyrometer | |
| 432. |
High temperature of around 2000°C of incandescent gas mantles is measured by a/an$? |
| A. | Specially designed thermocouple |
| B. | Optical pyrometer |
| C. | Radiation pyrometer |
| D. | None of these |
| Answer» D. None of these | |
| 433. |
Which of the following is not a speed measuring instrument?$? |
| A. | Psychrometer |
| B. | Stroboscope |
| C. | Tachometer |
| D. | All of the above |
| Answer» B. Stroboscope | |
| 434. |
A non-linear system will have __________ steady state values.$? |
| A. | One |
| B. | More than one |
| C. | Two |
| D. | Three |
| Answer» C. Two | |
| 435. |
Bode stability method uses __________ loop transfer function.$? |
| A. | Open |
| B. | Closed |
| C. | Either A or B |
| D. | Neither A nor B |
| Answer» B. Closed | |
| 436. |
Find the ultimate gain and frequency for a proportional controller in the case of a process having the transfer function Gp(s) = 1/(4s + 1)(2s + 1)(s + 1).$? |
| A. | W = 1/‚à ö14, Kc = 45/7‚à ö14 |
| B. | W = ‚à ö(7/6), Kc = 46/3 |
| C. | W = 1, Kc = 13 |
| D. | W = ‚à ö(7/8), Kc = 45/4 |
| Answer» C. W = 1, Kc = 13 | |
| 437. |
Thermal conductivity based continuous flue gas analyser makes use of varying thermal conductivity of the constituents of flue gases. Which of the following constituents of flue gases has the maximum thermal conductivity?$? |
| A. | CO‚ÇÇ |
| B. | N‚ÇÇ |
| C. | O‚ÇÇ |
| D. | CO |
| Answer» B. N‚Äö√á√á | |
| 438. |
For a feed back control system to be stable, the$? |
| A. | Roots of the characteristic equation should be real |
| B. | Poles of the closed loop transfer function should lie in the left half of the complex plane |
| C. | Bode plots of the corresponding open loop transfer function should monotoni-cally decrease |
| D. | Poles of the closed loop transfer function should lie in the right half of the complex plane |
| Answer» C. Bode plots of the corresponding open loop transfer function should monotoni-cally decrease | |
| 439. |
Composition of alloys can be determined by$? |
| A. | Polarograph |
| B. | Chromatograph |
| C. | Refractrometer |
| D. | None of these |
| Answer» B. Chromatograph | |
| 440. |
__________ type of element is normally not used in the bimetallic thermometers.$? |
| A. | Flat spiral |
| B. | Bourdon tube |
| C. | Single helix |
| D. | Multiple helix |
| Answer» C. Single helix | |
| 441. |
Nichol's chart deals with$? |
| A. | A.R. vs. phase lag of first order |
| B. | A.R. vs. phase lag of second order |
| C. | Closed loop values vs. open loop values |
| D. | Frequency response values of controllers |
| Answer» D. Frequency response values of controllers | |
| 442. |
Mass spectrometer is used for the composition analysis of$? |
| A. | Alloys |
| B. | Solids |
| C. | Isotopes |
| D. | None of these |
| Answer» D. None of these | |
| 443. |
Which of the following is not the triple point of water?$? |
| A. | 32°R |
| B. | 273°K |
| C. | 492°R |
| D. | 32°F |
| Answer» B. 273¬¨‚àûK | |
| 444. |
Pick out the wrong statement$? |
| A. | Proportional controller is normally used for level control in industrial applications |
| B. | CSTR can be considered as a distributed parameter system |
| C. | Distributed parameter approach gives partial differential equation |
| D. | Non-linear behaviour is exemplified by an on-off controller |
| Answer» C. Distributed parameter approach gives partial differential equation | |
| 445. |
Psychrometer determines the$? |
| A. | Humidity of gases |
| B. | Moisture content of solids |
| C. | Water of crystallisation |
| D. | Hygroscopic nature of solids |
| Answer» B. Moisture content of solids | |
| 446. |
The temperature range for which copper resistance thermometer can be used is __________ °C$? |
| A. | 0 to 150 |
| B. | -200 to 150 |
| C. | 350 to 750 |
| D. | 500 to 900 |
| Answer» C. 350 to 750 | |
| 447. |
__________ is the static characteristics of an instrument,$? |
| A. | Response |
| B. | Tine lag |
| C. | Drift |
| D. | Dynamic error |
| Answer» D. Dynamic error | |
| 448. |
Load cells are used for the measurement of$? |
| A. | Stress |
| B. | Weight |
| C. | Strain |
| D. | Velocity |
| Answer» C. Strain | |
| 449. |
The __________ of a vapor pressure thermometer is a primary element.$? |
| A. | Pointer |
| B. | Bourdon tube |
| C. | Bulb |
| D. | None of these |
| Answer» D. None of these | |
| 450. |
Nichol's chart deals with? |
| A. | A.R. vs. phase lag of first order |
| B. | A.R. vs. phase lag of second order |
| C. | Closed loop values vs. open loop values |
| D. | Frequency response values of controllers |
| Answer» D. Frequency response values of controllers | |