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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.
| 6851. |
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. | |
| 6852. |
Which of the following is not a differential pressure flow meter ? |
| A. | Rotameter |
| B. | Flow nozzle |
| C. | Orificemeter |
| D. | Venturimeter |
| Answer» B. Flow nozzle | |
| 6853. |
The transfer function of a second order system is |
| A. | <img src="/_files/images/chemical-engineering/process-control/341-9-1.png"> |
| B. | <img src="/_files/images/chemical-engineering/process-control/341-9-2.png"> |
| C. | <img src="/_files/images/chemical-engineering/process-control/341-9-3.png"> |
| D. | none of these |
| Answer» B. <img src="/_files/images/chemical-engineering/process-control/341-9-2.png"> | |
| 6854. |
Bode diagram are generated from output response of the system subjected to which of the following input? |
| A. | Impulse |
| B. | Step |
| C. | Ramp |
| D. | Sinusoidal |
| Answer» E. | |
| 6855. |
Which of the following thermocouples is the most suitable for measuring a temperature of about 1600 C in an oxidizing atmosphere ? |
| A. | Platinum-platinum + rhodium |
| B. | Iron-constantan |
| C. | Copper-constantan |
| D. | Chromel-alumel |
| Answer» B. Iron-constantan | |
| 6856. |
Mercury thermometer can be used to measure the temperature upto __________ C. |
| A. | 100 |
| B. | 250 |
| C. | 350 |
| D. | 750 |
| Answer» D. 750 | |
| 6857. |
The transfer function of a process is . If a step change is introduced into the system, then the response will be |
| A. | under damped |
| B. | critically damped |
| C. | over damped |
| D. | none of these |
| Answer» B. critically damped | |
| 6858. |
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 | |
| 6859. |
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 | |
| 6860. |
The open loop transfer function of a control system is . This represents |
| A. | a first order system. |
| B. | dead time system. |
| C. | a first order time lag. |
| D. | a second order system. |
| Answer» B. dead time system. | |
| 6861. |
Presence of a small amount of water in the organic systems can be determined by the __________ method. |
| A. | electrical conductivity |
| B. | polarimetry |
| C. | emission spectroscopy |
| D. | dielectric constant end loss factor |
| Answer» E. | |
| 6862. |
__________ is the static characteristics of an instrument, |
| A. | Response |
| B. | Tine lag |
| C. | Drift |
| D. | dynamic error |
| Answer» D. dynamic error | |
| 6863. |
Phase lag of the frequency response of a second order system to a sinusoidal forcing function |
| A. | is 30 |
| B. | is 90 at the most |
| C. | approaches 180 asymptotically |
| D. | is 120 |
| Answer» D. is 120 | |
| 6864. |
Dead zone in an instrument must be less than __________ percent of the scale. |
| A. | 0.2 |
| B. | 1.5 |
| C. | 4 |
| D. | 8 |
| Answer» B. 1.5 | |
| 6865. |
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 | |
| 6866. |
Liquid levels in autocalves are measued by |
| A. | simple float |
| B. | differential float type manometer |
| C. | glass gauge |
| D. | none of these |
| Answer» C. glass gauge | |
| 6867. |
E.m.f. generated by thermocouples is of the order of |
| A. | millivolts |
| B. | microvolts |
| C. | volts |
| D. | kilo volts |
| Answer» B. microvolts | |
| 6868. |
A pyrheliometer is an instrument used for measuring the |
| A. | bright sunshine period. |
| B. | beam radiation. |
| C. | diffuse radiation. |
| D. | none of these. |
| Answer» C. diffuse radiation. | |
| 6869. |
Flow rate through an orifice is __________ the pressure differential. |
| A. | proportional to |
| B. | inversely proportional to the square root of |
| C. | proportional to the square root of |
| D. | inversely proportional to the square of |
| Answer» D. inversely proportional to the square of | |
| 6870. |
The root locus method, a pole of a transfer function G(s) is the value of s for which G(s) approaches |
| A. | -1 |
| B. | 0 |
| C. | 1 |
| D. | |
| Answer» E. | |
| 6871. |
__________ 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 | |
| 6872. |
Suppose that the gain, time constant and dead time of a process with the following transfer function:Gc(s) = 10 exp( - 0.1s)/(0.5s + 1) are known with a possible error of 20% of their values. The largest permissible gain Kc of a proportional controller needs to be calculated below taking the values of process gain, time constant and dead time as |
| A. | 8, 0.6, 0.08 |
| B. | 12, 0.6, 0.12 |
| C. | 8, 0.6, 0.12 |
| D. | 12, 0.4, 0.08 |
| Answer» C. 8, 0.6, 0.12 | |
| 6873. |
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 | |
| 6874. |
When a bare thermocouple is covered by a protective sheath, the response becomes |
| A. | faster and oscillatory. |
| B. | faster and non-oscillatory. |
| C. | slower and oscillatory. |
| D. | slower and non-oscillatory. |
| Answer» E. | |
| 6875. |
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 | |
| 6876. |
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 | |
| 6877. |
Working principle of mercury in glass thermometer is based on volumetric expansion of mercury with increase in temperature. Which of the following undergoes minimum volumetric expansion for a given temperature change ? |
| A. | Water |
| B. | Mercury |
| C. | Methyl alcohal |
| D. | Carbon-tetrachloride |
| Answer» C. Methyl alcohal | |
| 6878. |
Bourdon gauges are used for measuring pressure (kg/cm2 ) |
| A. | < atmospheric |
| B. | > 2 (gauge) |
| C. | < 2 (gauge) |
| D. | > 10 (absolute) |
| Answer» C. < 2 (gauge) | |
| 6879. |
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 | |
| 6880. |
Mass spectrometer is used for the composition analysis of |
| A. | alloys |
| B. | solids |
| C. | isotopes |
| D. | none of these |
| Answer» D. none of these | |
| 6881. |
A first order system with a time constant of 1 min is subjected to frequency response analysis. At an input frequency of 1 radian/min, the phase shift is |
| A. | 45 |
| B. | -90 |
| C. | -180 |
| D. | -45 |
| Answer» E. | |
| 6882. |
__________ stability method uses open loop transfer function. |
| A. | Nyquist |
| B. | Mikhalov |
| C. | Ruth |
| D. | none of these |
| Answer» B. Mikhalov | |
| 6883. |
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. | |
| 6884. |
All the thermocouples used for temperature measurement use dissimilar metal |
| A. | strips |
| B. | bars |
| C. | wires |
| D. | beads |
| Answer» D. beads | |
| 6885. |
Specific gravity of a liquid can not be measured by a/an |
| A. | anemometer |
| B. | specific gravity bottle |
| C. | pycnometer |
| D. | hydrometer |
| Answer» B. specific gravity bottle | |
| 6886. |
__________ 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 | |
| 6887. |
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. | |
| 6888. |
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 | |
| 6889. |
Degree to which an instrument indicates the changes in measured variable without dynamic error is called its |
| A. | speed of response |
| B. | reproducibility |
| C. | fidielity |
| D. | static characteristics |
| Answer» D. static characteristics | |
| 6890. |
A barometer measures the __________ pressure. |
| A. | absolute |
| B. | gauge |
| C. | absolute as well as gauge |
| D. | dynamic |
| Answer» B. gauge | |
| 6891. |
Humidity of air can be determined by a |
| A. | chromatograph |
| B. | sling psychrometer |
| C. | mass spectrometer |
| D. | polarimeter |
| Answer» C. mass spectrometer | |
| 6892. |
What is the overall transfer function (C/R) of the following block diagram if G = G1. G2. G3 and H = H1.H2. |
| A. | <img src="/_files/images/chemical-engineering/process-control/342-17-2.png"> |
| B. | <img src="/_files/images/chemical-engineering/process-control/342-17-3.png"> |
| C. | <img src="/_files/images/chemical-engineering/process-control/342-17-4.png"> |
| D. | <img src="/_files/images/chemical-engineering/process-control/342-17-5.png"> |
| Answer» C. <img src="/_files/images/chemical-engineering/process-control/342-17-4.png"> | |
| 6893. |
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 | |
| 6894. |
Accurate temperature measurement performance of a radiation pyrometer can not be affected, if the |
| A. | enhancement or attentuation of redia-tion occurs in the sighting path. |
| B. | object and surrounding are at almost the same temperature. |
| C. | object has varying emissivity. |
| D. | object is transparent. |
| Answer» C. object has varying emissivity. | |
| 6895. |
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 | |
| 6896. |
Characteristic equation is the denominator of __________ loop transfer function. |
| A. | open |
| B. | closed |
| C. | both (a)and (b) |
| D. | neither (a) nor (b) |
| Answer» C. both (a)and (b) | |
| 6897. |
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 | |
| 6898. |
Polarograph is meant for the analysis of |
| A. | gaseous mixture |
| B. | miscible liquids |
| C. | solids |
| D. | isotopes |
| Answer» D. isotopes | |
| 6899. |
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. | |
| 6900. |
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. | 5 /12 |
| B. | /6 |
| C. | /12 |
| D. | /3 |
| Answer» B. /6 | |