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.
| 701. |
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. | |
| 702. |
Thermisters which have a very high temperature co-efficient of resistivity belong to the class of solid called |
| A. | dielectrics |
| B. | insulators |
| C. | semi conductors |
| D. | conductors |
| Answer» D. conductors | |
| 703. |
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) | |
| 704. |
__________ stability method uses open loop transfer function. |
| A. | Nyquist |
| B. | Mikhalov |
| C. | Ruth |
| D. | none of these |
| Answer» B. Mikhalov | |
| 705. |
Which of the following thermocouple materials does not contain nickel ? |
| A. | Alumel |
| B. | Chromel |
| C. | Constantan |
| D. | None of these. |
| Answer» E. | |
| 706. |
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) | |
| 707. |
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 | |
| 708. |
Thermal conductivity cell is the primary element of a/an __________ analyser. |
| A. | oxygen |
| B. | carbon dioxide |
| C. | carbon monoxide |
| D. | sulphur dioxide |
| Answer» C. carbon monoxide | |
| 709. |
Block diagram of a simple standard control system is shown below in the figure.Which of the following statement about the above control system is wrong ? |
| A. | The transfer functions of the measuring element and the process is represent by H and G2 respectively |
| B. | The overall transfer function for the change in load (X = 0) is given by |
| C. | The overall transfer function for the change in set point (X1 = 0) is given by |
| D. | Manipulated variable is represented by C. |
| Answer» E. | |
| 710. |
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. | |
| 711. |
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. | |
| 712. |
Bode stability method uses __________ loop transfer function. |
| A. | open |
| B. | closed |
| C. | either (a) or (b) |
| D. | neither (a) nor (b) |
| Answer» B. closed | |
| 713. |
For increased speed of response of an expansion pressure spring thermometer, the thermometer bulb should have a |
| A. | large area but small mass. |
| B. | high thermal conductivity. |
| C. | small specific heat. |
| D. | all'a', 'b' & 'c'. |
| Answer» E. | |
| 714. |
Which of the following instruments is not used for measuring sub-zero (<0°) temperatures ?$ |
| A. | Platinum resistance thermometer |
| B. | Mercury in glass thermometer |
| C. | Vapor pressure thermometer |
| D. | Radiation pyrometer |
| Answer» E. | |
| 715. |
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 | |
| 716. |
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. | |
| 717. |
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. | |
| 718. |
Vapour actuated pressure spring thermometer does not require ambient temperature compensation. Ambient temperature compensation is provided in gas or liquid expansion pressure spring thermometer by |
| A. | making the volume of thermometer bulb as large as conveniently possible. |
| B. | reducing the volume of the capillary to a minimum. |
| C. | reducing the volume of the receiving element to a minimum. |
| D. | all 'a', 'b' & 'c'. |
| Answer» E. | |
| 719. |
Which of the following filled system expansion thermometer has the capability to measure the lowest temperature ? |
| A. | Mercury in glass thermometer |
| B. | Mercury in steel thermometer |
| C. | Alcohol in glass thermometer |
| D. | Fused metal (Na or K) in steel thermometer |
| Answer» D. Fused metal (Na or K) in steel thermometer | |
| 720. |
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. | |
| 721. |
Mercury manometer (U-tube type) exemplifies a __________ order system. |
| A. | zero |
| B. | first |
| C. | second |
| D. | third |
| Answer» D. third | |
| 722. |
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. | |
| 723. |
Number of poles in a system with transfer function is |
| A. | 2 |
| B. | 5 |
| C. | 3 |
| D. | 1 |
| Answer» D. 1 | |
| 724. |
Which of the following thermometers is not suitable for distant reading upto 60 metres? |
| A. | Vapor pressure thermometer |
| B. | Mercury in glass thermometer |
| C. | Constant volume gas thermometer |
| D. | Resistance thermometer |
| Answer» C. Constant volume gas thermometer | |
| 725. |
The frequency response of a first order system, has a phase shift with lower and upper bounds given by |
| A. | - ∞, π/2 |
| B. | -π/2, π/2 |
| C. | -π/2, 0 |
| D. | 0, π/2 |
| Answer» E. | |
| 726. |
Gas analysis is commonly done using the |
| A. | thermal conductivity cell |
| B. | X-ray diffraction |
| C. | mass spectrometer |
| D. | emission spectrometer |
| Answer» B. X-ray diffraction | |
| 727. |
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. | |
| 728. |
pH meter has |
| A. | one cell |
| B. | two cells |
| C. | three cells |
| D. | no cell |
| Answer» C. three cells | |
| 729. |
Relationship between absorption/evolution of heat at the thermocouple junctions and the current flow in the circuit is given by __________ effect. |
| A. | Peltier |
| B. | Thomson |
| C. | Seebeck |
| D. | none of these |
| Answer» B. Thomson | |
| 730. |
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 | |
| 731. |
Flapper nozzle is used in a/an __________ controller. |
| A. | electronic |
| B. | hydraulic |
| C. | pneumatic |
| D. | none of these |
| Answer» D. none of these | |
| 732. |
A proportional controller with a gain of Kc is used to control a first order process. The offset will increase, if |
| A. | Kc is reduced. |
| B. | Kc is increased. |
| C. | integral control action is introduced. |
| D. | derivative control action is introduced. |
| Answer» C. integral control action is introduced. | |
| 733. |
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 | |
| 734. |
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 | |
| 735. |
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) | |
| 736. |
A negative gain margin expressed in decibels means a/an __________ system. |
| A. | stable |
| B. | unstable |
| C. | critically damped |
| D. | none of these |
| Answer» C. critically damped | |
| 737. |
Transfer function of transportation lag is |
| A. | eTS |
| B. | e-TS |
| C. | |
| Answer» C. | |
| 738. |
A control system has the following transfer functionThe initial value of the corresponding time function is |
| A. | 1 |
| B. | 43678 |
| C. | 43684 |
| D. | -1 |
| Answer» B. 43678 | |
| 739. |
Instrumentation in a plant offers the advantage of |
| A. | greater safety of operation |
| B. | better quality of product |
| C. | greater operation economy |
| D. | all (a), (b) and (c) |
| Answer» E. | |
| 740. |
Which of the following does not figure in the list of seven substances selected for international temperature scale ? |
| A. | Ice (F.P) and steam (B.P) |
| B. | Oxygen and sulphur (B.P) |
| C. | Antimony and silver (F.P) |
| D. | Zinc (B.P) and mercury (F.P) |
| Answer» E. | |
| 741. |
Which of the following is not a mechanical pressure sensing element ? |
| A. | Bellows |
| B. | Diaphragm |
| C. | Bourdon tube |
| D. | U-tube |
| Answer» E. | |
| 742. |
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 | |
| 743. |
For the time domain function f(t) = t, the Laplace transform of is given by |
| A. | 1/2 S3 |
| B. | 2/S3 |
| C. | 1/S3 |
| D. | 2/S2 |
| Answer» D. 2/S2 | |
| 744. |
Dilute wine was used as a thermometric liquid initially to develop temperature scale. First emperical temperature scale developed was the __________ scale. |
| A. | Kelvin |
| B. | Centigrade |
| C. | Fahrenheit |
| D. | Reaumer |
| Answer» D. Reaumer | |
| 745. |
Continuous shell temperature measurement in a liquid-liquid heat exchanger is done by a |
| A. | thermocouple |
| B. | reistance thermometer |
| C. | mercury in glass thermometer |
| D. | vapor pressure thermometer |
| Answer» B. reistance thermometer | |
| 746. |
A constant volume gas thermometer employing __________ is used to measure sub-zero (i.e., < 0° C) temperature.$ |
| A. | helium |
| B. | hydrogen |
| C. | nitrogen |
| D. | none of these |
| Answer» B. hydrogen | |
| 747. |
New Type : Which of the following is an undesirable dynamic characteristic of an instrument ? |
| A. | Reproducibility |
| B. | Dead zone |
| C. | Time lag |
| D. | Static error |
| Answer» D. Static error | |
| 748. |
The inverse Laplace transform of the function is |
| A. | 1 + et |
| B. | 1 - et |
| C. | 1 + e-t |
| D. | 1 - e-t |
| Answer» E. | |
| 749. |
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 | |
| 750. |
Which of the following relates the absorption & evolution of heat at the junctions of a thermocouple to the current flow in the circuit? |
| A. | Seebeck effect |
| B. | Peltier effect |
| C. | Joule heating effect |
| D. | Thomson effect |
| Answer» C. Joule heating effect | |