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.
| 751. |
Pressure of 0.0001 absolute psi can be measured by __________ gauge. |
| A. | Mcloid |
| B. | Pirani |
| C. | thermocouple |
| D. | none of these |
| Answer» B. Pirani | |
| 752. |
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. | |
| 753. |
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 | |
| 754. |
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) | |
| 755. |
The transfer function for an ideal proportional plus reset controller (reset time T) is |
| A. | |
| B. | Kc(1 + TS) |
| C. | |
| D. | |
| Answer» B. Kc(1 + TS) | |
| 756. |
Thermistors are used in __________ devices. |
| A. | voltage measuring |
| B. | temperature measuring |
| C. | temperature compensating |
| D. | both(b)&(c) |
| Answer» E. | |
| 757. |
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 will give the same output. |
| Answer» D. All will give the same output. | |
| 758. |
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. | |
| 759. |
__________ is undesirable in thermocouples used in industries, |
| A. | Linear relation of emf to temperature |
| B. | Corrosion resistance |
| C. | Oxidation resistance |
| D. | Non-linear relation of emf to temperature |
| Answer» E. | |
| 760. |
Composition of natural gas is determined by the |
| A. | Haldane apparatus |
| B. | mass spectrometer |
| C. | chromatograph |
| D. | both (b) and (c) |
| Answer» E. | |
| 761. |
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. | |
| 762. |
Flow rate of sludge is not measured by a/an |
| A. | orificemeter |
| B. | open weir |
| C. | kennison nozzle |
| D. | both(b)&(c) |
| Answer» E. | |
| 763. |
Which is the symbol for "pneumatic control valve" ? |
| A. | |
| B. | |
| C. | |
| D. | none of these |
| Answer» B. | |
| 764. |
An ideal PID controller has the transfer function . The frequency at which the magnitude ratio of the controller is 1, is |
| A. | 0.5/0.2 |
| B. | 0.2/0.5 |
| C. | 0.2 x 0.5 |
| D. | 1/0.2 x 0.5 |
| Answer» E. | |
| 765. |
The second order system with the transfer function has a damping ratio of |
| A. | 2 |
| B. | 0.5 |
| C. | 1 |
| D. | 4 |
| Answer» C. 1 | |
| 766. |
Volumetric expansion is the working principle of the __________ thermometers. |
| A. | mercury in glass |
| B. | constant volume gas |
| C. | vapor pressure |
| D. | bimetallic |
| Answer» B. constant volume gas | |
| 767. |
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. | |
| 768. |
0n-off control which is a special case of proportional control, has a band width of about __________ percent. |
| A. | 100 |
| B. | 75 |
| C. | 25 |
| D. | 0 |
| Answer» E. | |
| 769. |
The level of a liquid under pressure can be determined using |
| A. | bubbler system |
| B. | differential pressure manometer |
| C. | diaphragm box system |
| D. | air-trap system |
| Answer» C. diaphragm box system | |
| 770. |
The open loop transfer function of a process is . In the root locus diagram, the poles will be at |
| A. | -1, -4 |
| B. | 1, 4 |
| C. | -2, -3 |
| D. | 2, 3 |
| Answer» D. 2, 3 | |
| 771. |
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. | |
| 772. |
Measurement of sub-zero Celcius temperature in industry is done most commonly by |
| A. | thermocouples |
| B. | resistance thermometers |
| C. | gas thermometers |
| D. | bi-metallic thermometers |
| Answer» C. gas thermometers | |
| 773. |
Strain gage pressure transducers are used to measure __________ pressures. |
| A. | gage as well as vacuum |
| B. | absolute as well as differential |
| C. | both (a) and (b) |
| D. | neither (a) nor (b) |
| Answer» D. neither (a) nor (b) | |
| 774. |
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. | |
| 775. |
In a shell and tube heat exchanger, the flow rate of heating/cooling fluid is the __________ variable. |
| A. | load |
| B. | controlled |
| C. | manipulated |
| D. | none of these |
| Answer» D. none of these | |
| 776. |
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 | |
| 777. |
Paramagnetism method is not used for the composition determination of __________ in gases. |
| A. | oxygen |
| B. | oxides of nitrogen |
| C. | carbon dioxide |
| D. | any of these |
| Answer» D. any of these | |
| 778. |
If response of a control system is to be free of offset and oscillation, the most suitable controller is |
| A. | proportional controller. |
| B. | proportional-derivative(PD)controller. |
| C. | proportional-integral (PI) controller. |
| D. | proportional integral-derivative (PID) controller. |
| Answer» E. | |
| 779. |
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. | |
| 780. |
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 | |
| 781. |
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 | |
| 782. |
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» D. one real positive and the other real negative. | |
| 783. |
Working principle of radiation pyrometer is based on the |
| A. | Wien's law |
| B. | Kirchoffs law |
| C. | stefan-Boltzman law |
| D. | Seebeck effect |
| Answer» D. Seebeck effect | |
| 784. |
Which of the following controllers has maximum offset ? |
| A. | P-controller |
| B. | P-I controller |
| C. | P-D controller |
| D. | P-I-D controller |
| Answer» B. P-I controller | |
| 785. |
A magnetic flowmeter is |
| A. | based on the principle of Faraday's law. |
| B. | capable of measuring the flow rate of slurries and electrolytes. |
| C. | based on the linear relationship between the fluid flow rate and the induced voltage. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 786. |
Which of the following relates the emf. generated in a single homogeneous wire to the temperature difference ? |
| A. | Peltier effect |
| B. | Thomson effect |
| C. | Seebeck effect |
| D. | none of these |
| Answer» C. Seebeck effect | |
| 787. |
Routh test |
| A. | criterion provides information about the actual location of roots. |
| B. | cannot be used to test the stability of a control system containing transportation lag. |
| C. | criterion is not applicable to systems with polynomial characteristic equation. |
| D. | can not determine as to how many roots of the characteristics equation have positive real roots. |
| Answer» C. criterion is not applicable to systems with polynomial characteristic equation. | |
| 788. |
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 | |
| 789. |
What is the Laplace transform of impulse input having magnitude 'X' ? |
| A. | X |
| B. | X2 |
| C. | 1/X |
| D. | 1 |
| Answer» E. | |
| 790. |
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. | |
| 791. |
Starting temperature of optical radiation pyrometer is __________ °C. |
| A. | 800 |
| B. | 400 |
| C. | 1200 |
| D. | 1500 |
| Answer» B. 400 | |
| 792. |
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 | |
| 793. |
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. | |
| 794. |
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¬∞ & 460¬∞ | |
| 795. |
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 | |
| 796. |
Gas chromatography is used for the measurement of |
| A. | temperature |
| B. | pressure |
| C. | concentration |
| D. | flow rate |
| Answer» D. flow rate | |
| 797. |
The response of two tanks of same size and resistance in series is |
| A. | under damped |
| B. | critically damped |
| C. | over damped |
| D. | none of the above |
| Answer» C. over damped | |
| 798. |
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 | |
| 799. |
What is the Laplace transform of sin t ? |
| A. | |
| B. | |
| C. | |
| D. | |
| Answer» B. | |
| 800. |
Response of a system to a sinusoidal input is called __________ response. |
| A. | impluse |
| B. | unit step |
| C. | frequency |
| D. | none of these |
| Answer» D. none of these | |