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MCQOPTIONS
This section includes 8247 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 6751. |
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 | |
| 6752. |
The root locus plot of the roots of the characteristics equation of a closed loop system having the open loop transfer function will have a definite num-ber of loci for variation of K from 0 to . The number of loci is |
| A. | 1 |
| B. | 3 |
| C. | 4 |
| D. | 2 |
| Answer» C. 4 | |
| 6753. |
A manometer measures the __________ pressure. |
| A. | atmospheric |
| B. | absolute |
| C. | gauge |
| D. | none of these |
| Answer» D. none of these | |
| 6754. |
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. | |
| 6755. |
Minute depression of freezing point of a liquid solvent on addition of a solid solute can be best measured by a |
| A. | Beckman thermometer |
| B. | dilatometer |
| C. | mercury thermometer |
| D. | bimetallic thermometer |
| Answer» B. dilatometer | |
| 6756. |
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. | |
| 6757. |
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 | |
| 6758. |
Mcleoid gauge is used to measure the |
| A. | point velocity |
| B. | flow rate |
| C. | vacuum |
| D. | pressure |
| Answer» D. pressure | |
| 6759. |
Which of the following thermocouples has the widest temperature measurement range ? |
| A. | Iron-constantan |
| B. | Chromel-alumel |
| C. | Copper-constantan |
| D. | Platinum-platinum/rhodium |
| Answer» E. | |
| 6760. |
Temperature control of an exothermic chemical reaction taking place in a CSTR is done with the help of cooling water flowing in a jacket around the reactor. The types of valve and controller action to be recommended are |
| A. | air to open valve with the controller direct acting. |
| B. | air to close valve with the controller indirect acting. |
| C. | air to open valve with the controller indirect acting. |
| D. | air to close valve with the controller direct acting. |
| Answer» D. air to close valve with the controller direct acting. | |
| 6761. |
Bourdon tube is never made of |
| A. | phosphor bronze |
| B. | monel metal |
| C. | stainless steel |
| D. | cast iron |
| Answer» E. | |
| 6762. |
"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 | |
| 6763. |
Pick out the symbol for "locally mounted instrument" in instrumentation diagram. |
| A. | <img src="/_files/images/chemical-engineering/process-control/344-47-1.png"> |
| B. | <img src="/_files/images/chemical-engineering/process-control/344-47-2.png"> |
| C. | <img src="/_files/images/chemical-engineering/process-control/344-47-3.png"> |
| D. | <img src="/_files/images/chemical-engineering/process-control/344-47-4.png"> |
| Answer» B. <img src="/_files/images/chemical-engineering/process-control/344-47-2.png"> | |
| 6764. |
Sub-zero temperature (< 0 C) can be measured by a constant volume gas thermometer employing |
| A. | helium |
| B. | nitrogen |
| C. | hydrogen |
| D. | none of these |
| Answer» B. nitrogen | |
| 6765. |
__________ is an example of distributed parameter system |
| A. | Tubular reactor |
| B. | CSTR |
| C. | On-off controller |
| D. | none of these |
| Answer» B. CSTR | |
| 6766. |
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 | |
| 6767. |
Maximum differential pressure in liquid manometer is __________ psi. |
| A. | 20 |
| B. | 30 |
| C. | 40 |
| D. | 50 |
| Answer» C. 40 | |
| 6768. |
Phase margin is equal to |
| A. | 180 - phase lag |
| B. | phase lag - 180 |
| C. | phase lag + 180 |
| D. | phase lag + 90 |
| Answer» B. phase lag - 180 | |
| 6769. |
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 | |
| 6770. |
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 | |
| 6771. |
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 | |
| 6772. |
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. | |
| 6773. |
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 | |
| 6774. |
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. | |
| 6775. |
A simple pitot tube measures the |
| A. | average velocity |
| B. | maximum velocity |
| C. | point velocity |
| D. | static pressure |
| Answer» E. | |
| 6776. |
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. | |
| 6777. |
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. | |
| 6778. |
Stalagmometer is used for the measurement of |
| A. | kinematic viscosity |
| B. | surface tension |
| C. | refractive index |
| D. | optical activity |
| Answer» C. refractive index | |
| 6779. |
Which of the following is not suitable for measuring the temperature of a red hot object in the range of 800 - 1600 C ? |
| A. | Optical pyrometer |
| B. | Radiation pyrometer |
| C. | Photoelectric pyrometer |
| D. | Thermocouples |
| Answer» E. | |
| 6780. |
Find the Laplace transform of the following input function shown in figure. |
| A. | <img src="/_files/images/chemical-engineering/process-control/386-633-2.png"> |
| B. | <img src="/_files/images/chemical-engineering/process-control/386-633-3.png"> |
| C. | <img src="/_files/images/chemical-engineering/process-control/386-633-4.png"> |
| D. | <img src="/_files/images/chemical-engineering/process-control/386-633-5.png"> |
| Answer» B. <img src="/_files/images/chemical-engineering/process-control/386-633-3.png"> | |
| 6781. |
Flame photometry is used for the determination of compositional analysis of |
| A. | solids |
| B. | alkali metals |
| C. | natural gas |
| D. | isotopes |
| Answer» C. natural gas | |
| 6782. |
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 (a), (b) & (c). |
| Answer» D. all (a), (b) & (c). | |
| 6783. |
Photoelectric pyrometers are suitable in the temperature range of __________ C. |
| A. | 400-1600 |
| B. | 800-1600 |
| C. | 800-2500 |
| D. | 400-1000 |
| Answer» C. 800-2500 | |
| 6784. |
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 | |
| 6785. |
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 | |
| 6786. |
Hot wire anemometer is used for the measurement of |
| A. | flow rates of fluids. |
| B. | flow rates of granular solids. |
| C. | very high temperature. |
| D. | thermal conductivity of gases. |
| Answer» B. flow rates of granular solids. | |
| 6787. |
Time constant is the |
| A. | time taken by the controlled variable to reach 63.2% of its full change. |
| B. | same as transportation lag. |
| C. | same as dead time. |
| D. | time required by the measured variable to reach 63.2% of its ultimate change. |
| Answer» B. same as transportation lag. | |
| 6788. |
Mercury manometer (U-tube type) exemplifies a __________ order system. |
| A. | zero |
| B. | first |
| C. | second |
| D. | third |
| Answer» D. third | |
| 6789. |
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 | |
| 6790. |
Bode stability method uses __________ loop transfer function. |
| A. | open |
| B. | closed |
| C. | either (a) or (b) |
| D. | neither (a) nor (b) |
| Answer» B. closed | |
| 6791. |
Working principle of bimetallic thermometers is difference in linear co-efficient of thermal expansion of two strips of different metals welded together. Which of the following has the maximum thermal co-efficient of linear expansion? |
| A. | Nickel |
| B. | Brass |
| C. | Chromel |
| D. | Invar |
| Answer» C. Chromel | |
| 6792. |
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. | |
| 6793. |
Which of the following flow-metering instru-ments is an areameter ? |
| A. | Venturimeter |
| B. | Rotameter |
| C. | Pitot tube |
| D. | Hot wire anemometer |
| Answer» C. Pitot tube | |
| 6794. |
Out of the following themocouple wire insulating material, the highest temperature rating is for |
| A. | teflon |
| B. | ceramic fibre |
| C. | asbestos |
| D. | fibre glass |
| Answer» C. asbestos | |
| 6795. |
Which is the most suitable instrument for measuring pressure below 3 microns ? |
| A. | Mcleoid gauge |
| B. | Alphatron |
| C. | Ionisation gauge |
| D. | Bourdon guage |
| Answer» D. Bourdon guage | |
| 6796. |
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) | |
| 6797. |
Flow rate of sludge is not measured by a/an |
| A. | orificemeter |
| B. | open weir |
| C. | kennison nozzle |
| D. | both(b)&(c) |
| Answer» E. | |
| 6798. |
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 | |
| 6799. |
Which of following error integral is considered as the best criterion in controller settings ? |
| A. | <img src="/_files/images/chemical-engineering/process-control/345-68-1.png"> |
| B. | <img src="/_files/images/chemical-engineering/process-control/345-68-2.png"> |
| C. | <img src="/_files/images/chemical-engineering/process-control/345-68-3.png"> |
| D. | none of these |
| Answer» D. none of these | |
| 6800. |
Polarisation of light forms the working principle of a |
| A. | polarimeter |
| B. | polarograph |
| C. | chromatograph |
| D. | spectrometer |
| Answer» B. polarograph | |