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.
| 451. |
__________ 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 | |
| 452. |
Composition of alloys can be determined by? |
| A. | Polarograph |
| B. | Chromatograph |
| C. | Refractrometer |
| D. | None of these |
| Answer» B. Chromatograph | |
| 453. |
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 | |
| 454. |
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 | |
| 455. |
Emf developed by a thermocouple, while measuring a temperature of 600°C is about 5.5 mV. The type of thermocouple used is? |
| A. | Chromel-alumel |
| B. | Iron-constantan |
| C. | Platinum-platinum+rhodium |
| D. | Either A, B or C |
| Answer» D. Either A, B or C | |
| 456. |
Which is the strongest paramagnetic gas?? |
| A. | CO‚ÇÇ |
| B. | O‚ÇÇ |
| C. | NO |
| D. | NO‚ÇÇ |
| Answer» C. NO | |
| 457. |
Which of the following is a 'contact' pyrometer?? |
| A. | Resistance pyrometer |
| B. | Optical pyrometer |
| C. | Radiation pyrometer |
| D. | Infra red pyrometer |
| Answer» B. Optical pyrometer | |
| 458. |
The term analogous to voltage in a single tank system is the? |
| A. | Heat content of the system |
| B. | Liquid volume in the tank |
| C. | Flow rate |
| D. | Level of liquid |
| Answer» E. | |
| 459. |
Gas chromatography is used for the measurement of? |
| A. | Temperature |
| B. | Pressure |
| C. | Concentration |
| D. | Flow rate |
| Answer» D. Flow rate | |
| 460. |
The transfer function of a first order system is? |
| A. | 1/(Ts + 1) |
| B. | 1/Ts |
| C. | S/(Ts + 1) |
| D. | None of these |
| Answer» B. 1/Ts | |
| 461. |
The Laplace transform of exp(at), where a > 0, is defined only for the Laplace parameter, s > a since? |
| A. | The function is exponential |
| B. | The Laplace transform of integral of exp(at) has finite values only for s > a |
| C. | The Laplace transform integral of exp(at) has initial values only for s > a |
| D. | The function exp(at) is piece-wise continuous only for s > a |
| Answer» C. The Laplace transform integral of exp(at) has initial values only for s > a | |
| 462. |
Stroboscope is used for the measurement of? |
| A. | Rpm of a flywheel |
| B. | Frequency of light |
| C. | Depression of freezing point |
| D. | Liquid level under pressure |
| Answer» B. Frequency of light | |
| 463. |
Smoke density of the flue gas going out of the chimney is measured by a? |
| A. | Polarograph |
| B. | Thermal conductivity meter |
| C. | Photo electric cell |
| D. | Chromatograph |
| Answer» D. Chromatograph | |
| 464. |
The __________ of a vapor pressure thermometer is a functioning element.? |
| A. | Pointer |
| B. | Bourdon tube |
| C. | Bulb |
| D. | None of these |
| Answer» B. Bourdon tube | |
| 465. |
Gain margin is equal to the? |
| A. | Amplitude ratio |
| B. | Reciprocal of amplitude ratio |
| C. | Gain in P controller |
| D. | Gain in P-I controller |
| Answer» C. Gain in P controller | |
| 466. |
Which of the following is not a differential pressure flow meter?? |
| A. | Rotameter |
| B. | Flow nozzle |
| C. | Orificemeter |
| D. | Venturimeter |
| Answer» B. Flow nozzle | |
| 467. |
What is the normal percentage of rhodium in platinum + rhodium element used in the thermocouple?? |
| A. | 0.1 |
| B. | 3 |
| C. | 13 |
| D. | 29 |
| Answer» D. 29 | |
| 468. |
Bourdon tube is never made of? |
| A. | Phosphor bronze |
| B. | Monel metal |
| C. | Stainless steel |
| D. | Cast iron |
| Answer» E. | |
| 469. |
Conversion formula for converting amplitude ratio (AR) into decibels is? |
| A. | Decibel = 20 log10 (AR) |
| B. | Decibel = 20 loge (AR) |
| C. | Decibel = 20 log10 (AR)0.5 |
| D. | Decibel = 20 loge (AR)0.5 |
| Answer» B. Decibel = 20 loge (AR) | |
| 470. |
Turbine flow meters are suitable for? |
| A. | Very limited flow ranges |
| B. | Cryogenic flow measurements |
| C. | Aerospace and in air borne applications |
| D. | Both B and C |
| Answer» E. | |
| 471. |
Cascade control means? |
| A. | Feed forward control |
| B. | More than one feed-back loop |
| C. | On-off control |
| D. | One feed-back loop |
| Answer» C. On-off control | |
| 472. |
Out of the following temperature measuring instruments, the measurement accuracy will be minimum for the? |
| A. | Mercury in glass thermometer |
| B. | Optical pyrometer |
| C. | Iron-constantan thermocouple |
| D. | Alcohol filled thermometer |
| Answer» C. Iron-constantan thermocouple | |
| 473. |
Emf developed by a thermocouple while measuring a temperature of 400°C is 22 mV. The type of thermocouple used is? |
| A. | Chromel-alumel |
| B. | Iron-constantan |
| C. | Platinum-rhodium |
| D. | Platinum-platinum+rhyodium |
| Answer» C. Platinum-rhodium | |
| 474. |
In a feed-back control system G and H denote open loop and close loop transfer functions respectively. The output-input relationship is? |
| A. | G/(1 + H) |
| B. | H(1 + G) |
| C. | G/H |
| D. | H/G |
| Answer» C. G/H | |
| 475. |
A photo electric device in which the resistance of the metal is directly proportional to the light striking on it, is known as photo-conductive cell. Photoelectric transducers are used for the measurement of those parameters, which can be used to produce variation in? |
| A. | Light intensity |
| B. | Current |
| C. | Flux density |
| D. | Voltage |
| Answer» B. Current | |
| 476. |
Which of the following filled system expansion thermometers has the lowest positive temperature measurement capability? |
| A. | Mercury in glass thermometer |
| B. | Alcohol in glass thermometer |
| C. | Fused metal (Na or K) in steel thermometer |
| D. | Nitrogen in steel thermometer |
| Answer» C. Fused metal (Na or K) in steel thermometer | |
| 477. |
Starting temperature of optical radiation pyrometer is __________ °C.$ |
| A. | 800 |
| B. | 400 |
| C. | 1200 |
| D. | 1500 |
| Answer» B. 400 | |
| 478. |
What is the dynamic error in a critically damped second order instrument for a ramp input (AT)? |
| A. | 0.5 AT |
| B. | 2 AT |
| C. | ‚à öAT |
| D. | 1.5 AT |
| Answer» C. ‚Äö√ √∂AT | |
| 479. |
A system with transfer function (2S/4S) + 1 is of __________ order. |
| A. | Zero |
| B. | 1st |
| C. | 2nd |
| D. | 3rd |
| Answer» C. 2nd | |
| 480. |
Temperature of molten pig iron (1450°C) and molten slag (1500°C) flowing out of a blast furnace is measured by a/an$ |
| A. | Chromel-alumel thermocouple |
| B. | Optical pyrometer |
| C. | Radiation pyrometer |
| D. | Either B or C |
| Answer» E. | |
| 481. |
Which of the following can not measure a temperature of 1600°C ?$ |
| A. | Platinum resistance thermometer |
| B. | Thermocouple |
| C. | Photo-electric pyrometer |
| D. | Radiation pyrometer |
| Answer» B. Thermocouple | |
| 482. |
Normal mercury thermometer can be used to measure a temperature of about 300°C. However, its maximum temperature measurement range can be increased upto about 500°C by$ |
| A. | Filling nitrogen under pressure in the stem |
| B. | Increasing the diameter of the tube |
| C. | Using steel tube in place of glass tube |
| D. | Accounting for the tube expansion |
| Answer» B. Increasing the diameter of the tube | |
| 483. |
Helium gas constant volume thermometer is suitable for the measurement of a temperature of __________ °C.$ |
| A. | < 100 |
| B. | < 0 |
| C. | > 0 |
| D. | > 800 |
| Answer» C. > 0 | |
| 484. |
Resistance of a gas in a vessel is given by (where, P = pressure, V = volume of the vessel, n = no. of moles of the gas, R = gas constant) |
| A. | V/nRT |
| B. | nRT/V |
| C. | nRT/P |
| D. | p/nRT |
| Answer» B. nRT/V | |
| 485. |
Which of the following is not a second order instrument? |
| A. | Mercury in glass thermometer with covering |
| B. | Bare mercury in glass thermometer |
| C. | Pressure gauge with one bellow, two tubes and a tank |
| D. | None of these |
| Answer» C. Pressure gauge with one bellow, two tubes and a tank | |
| 486. |
Which of the following is a desirable characteristic of an instrument? |
| A. | High drift |
| B. | High fidelity |
| C. | High measuring lag |
| D. | Poor reproducibility |
| Answer» C. High measuring lag | |
| 487. |
Mercury thermometer is commonly used for low temperature measruement. The freezing point and boiling point of mercury are respectively __________ °C.$ |
| A. | - 39 and 350 |
| B. | - 51 and 439 |
| C. | - 79 and 395 |
| D. | - 10 and 425 |
| Answer» B. - 51 and 439 | |
| 488. |
Which of the following thermocouples will give the highest output for the same value of hot and cold junction temperature? |
| A. | Platinum-platinum + rhodium |
| B. | Iron-constantan |
| C. | Chromel-constantan |
| D. | All of the above |
| Answer» D. All of the above | |
| 489. |
When the damping co-efficient (ξ) is unity, the system is$ |
| A. | Overdamped |
| B. | Critically damped |
| C. | Underdamped |
| D. | Highly fluctuating |
| Answer» C. Underdamped | |
| 490. |
The maximum service temperature for fibre glass used as thermocouple wire insulation material is __________ °C.$ |
| A. | 250 |
| B. | 500 |
| C. | 750 |
| D. | 1000 |
| Answer» C. 750 | |
| 491. |
A first order system with unity gain and time constant τ is subjected to a sinusoidal input of frequency w = 1/τ. The amplitude ratio for this system is$ |
| A. | 1 |
| B. | 0.5 |
| C. | 1/‚à ö2 |
| D. | 0.25 |
| Answer» D. 0.25 | |
| 492. |
Which of the following measurements can be made by the measurement of emf? |
| A. | PH value |
| B. | Degree of hydrolysis |
| C. | Composition of complex ions |
| D. | All of the above |
| Answer» E. | |
| 493. |
Which of the following is not a mechanical pressure sensing element? |
| A. | Bellows |
| B. | Diaphragm |
| C. | Bourdon tube |
| D. | U-tube |
| Answer» E. | |
| 494. |
Which of the following temperature measuring instruments need not touch the object whose temperature is being measured? |
| A. | Radiation/infrared pyrometer |
| B. | Filled system thermometer |
| C. | Mercury in glass thermometer |
| D. | Thermo electric pyrometer |
| Answer» B. Filled system thermometer | |
| 495. |
Ordinary mercury in glass thermometer is used for measuring temperature upto 120°C. However, for measuring higher temperature upto __________ °C, thermometer is made by filling nitrogen under pressure above the mercury, which stops the evaporation of mercury and reduces the chance of broken thread of mercury.$ |
| A. | 250 |
| B. | 350 |
| C. | 550 |
| D. | 700 |
| Answer» D. 700 | |
| 496. |
Emf developed by a thermocouple while measuring a temperature of 800°C is about 31 mV. The type of thermocouple used is$ |
| A. | Chromel-alumel |
| B. | Iron-constantan |
| C. | Platinum-platinum+rhodium |
| D. | None of these |
| Answer» B. Iron-constantan | |
| 497. |
Which thermocouple can be used to measure a temperature of around 1400°C ?# |
| A. | Copper-constantan |
| B. | Aluminium-chromel |
| C. | Platinum-platinum+rhodium |
| D. | None of these |
| Answer» D. None of these | |
| 498. |
Platinum resistance thermometer can be used upto antimony point which is __________ °C, and is the temperature of equilibrium between solid antimony & liquid antimony at normal atmospheric pressure.# |
| A. | 961.93 |
| B. | 630.74 |
| C. | 1064.43 |
| D. | 1261.93 |
| Answer» C. 1064.43 | |
| 499. |
__________ thermometer can not measure sub-zero (< 0° C) temperature,# |
| A. | Mercury in glass |
| B. | Bimetallic |
| C. | Vapor pressure |
| D. | Resistance |
| Answer» C. Vapor pressure | |
| 500. |
__________ temperature scale assigns 0° to the 'ice point' and 80° to the 'steam point'.# |
| A. | Celcius |
| B. | Rankine |
| C. | Reumur |
| D. | Farenhite |
| Answer» D. Farenhite | |