MCQOPTIONS
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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.
| 6701. |
The unit of 'time constant' of a system is the same as that of |
| A. | velocity |
| B. | time |
| C. | (time) |
| D. | <sup>-1</sup> |
| E. | none of these |
| Answer» C. (time) | |
| 6702. |
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. | |
| 6703. |
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) | |
| 6704. |
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. | |
| 6705. |
In a feed-back control system G and H denote open loop and close loop transfer functions respectively. The output-input relationship is |
| A. | <img src="/_files/images/chemical-engineering/process-control/382-596-1.png"> |
| B. | <img src="/_files/images/chemical-engineering/process-control/382-596-2.png"> |
| C. | <img src="/_files/images/chemical-engineering/process-control/382-596-3.png"> |
| D. | <img src="/_files/images/chemical-engineering/process-control/382-596-4.png"> |
| Answer» C. <img src="/_files/images/chemical-engineering/process-control/382-596-3.png"> | |
| 6706. |
Flow rate measurement of hostile acids and alkalis can be most suitably done by a/an |
| A. | venturimeter |
| B. | orificemeter |
| C. | magnetic flow meter |
| D. | hot wire anemometer |
| Answer» D. hot wire anemometer | |
| 6707. |
Compositional analysis of flue gas coming out of a furnace in respect of O2 and CO2% can be continuously done by a/an |
| A. | orsat apparatus |
| B. | thermal conductivity cell |
| C. | zirconia probe |
| D. | chromatograph |
| Answer» C. zirconia probe | |
| 6708. |
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 | |
| 6709. |
The pressure sensing element of elastic type pressure gauge is never made in the form of a |
| A. | bellow |
| B. | diaphragm |
| C. | strip |
| D. | Bourdon tube |
| Answer» D. Bourdon tube | |
| 6710. |
Which is the symbol for "pneumatic control valve" ? |
| A. | <img src="/_files/images/chemical-engineering/process-control/344-48-1.png"> |
| B. | <img src="/_files/images/chemical-engineering/process-control/344-48-2.png"> |
| C. | <img src="/_files/images/chemical-engineering/process-control/344-48-3.png"> |
| D. | none of these |
| Answer» B. <img src="/_files/images/chemical-engineering/process-control/344-48-2.png"> | |
| 6711. |
Silver point temperature is __________ C. |
| A. | 760.5 |
| B. | 860.5 |
| C. | 960.5 |
| D. | 1060.5 |
| Answer» D. 1060.5 | |
| 6712. |
A non-linear system will have __________ steady state values. |
| A. | one |
| B. | more than one |
| C. | two |
| D. | three |
| Answer» C. two | |
| 6713. |
Which of the following is not a variable area flow meter ? |
| A. | Piston type meter |
| B. | Rotameter |
| C. | Magnetic flow meter |
| D. | Orifice and tapered plug meter |
| Answer» D. Orifice and tapered plug meter | |
| 6714. |
With increase in temperature, the electrical conductivity of the platinum used in the resistance thermometer |
| A. | increases |
| B. | decreases |
| C. | remains constant |
| D. | increases exponentially |
| Answer» C. remains constant | |
| 6715. |
Thermocouple is suitable for measuring |
| A. | liquid temperatures only. |
| B. | very high temperatures only. |
| C. | very low temperatures only. |
| D. | both high and low temperatures. |
| Answer» E. | |
| 6716. |
Bimetal strips are not used in |
| A. | bimetallic thermometers. |
| B. | thermocouples. |
| C. | thermostats. |
| D. | relays for opening & closing of electrical circuits. |
| Answer» C. thermostats. | |
| 6717. |
When the damping co-efficient ( ) is unity, the system is |
| A. | Overdamped. |
| B. | Critically damped. |
| C. | Underdamped. |
| D. | Highly fluctuating. |
| Answer» C. Underdamped. | |
| 6718. |
Nickel percentage in invar which is an iron-nickel alloy, and is used as a thermocouple material is |
| A. | 12 |
| B. | 36 |
| C. | 54 |
| D. | 68 |
| Answer» C. 54 | |
| 6719. |
Water is flowing through a series of four tanks and getting heated as shown in figure. It is desired to design a cascade control scheme for controlling the temperature of water leaving the tank 4 as there is a disturbance in the temperature of a second stream entering the tank 2. Select the best place to take the secondary measurement for the second loop. |
| A. | Tank 1 |
| B. | Tank 2 |
| C. | Tank 3 |
| D. | Tank 4 |
| Answer» D. Tank 4 | |
| 6720. |
Composition of natural gas is determined by the |
| A. | Haldane apparatus |
| B. | mass spectrometer |
| C. | chromatograph |
| D. | both (b) and (c) |
| Answer» E. | |
| 6721. |
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. | |
| 6722. |
For two non-interacting first order systems connected in series, the overall transfer function is the __________ of the individual transfer functions. |
| A. | product |
| B. | ratio |
| C. | sum |
| D. | difference |
| Answer» B. ratio | |
| 6723. |
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 | |
| 6724. |
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 | |
| 6725. |
Which of the following thermocouples has the least temperature measurement range? |
| A. | Copper-constantan |
| B. | Chromel-alumel |
| C. | Platinum-platinum/rhodium |
| D. | Iron-constantan |
| Answer» B. Chromel-alumel | |
| 6726. |
Temperature of __________ can not be measured by an optical or radiation pyrometer. |
| A. | hot blast (air) from stoves |
| B. | molten slag flowing out of blast furnace |
| C. | combustion space in boilers |
| D. | rotary limestone calcination kiln |
| Answer» B. molten slag flowing out of blast furnace | |
| 6727. |
A system with transfer function is of __________ order. |
| A. | zero |
| B. | 1st |
| C. | 2nd |
| D. | 3rd |
| Answer» C. 2nd | |
| 6728. |
In Bode plot, vs is plotted on a/an __________ graph paper. |
| A. | log-log |
| B. | ordinary |
| C. | semi-log |
| D. | triangular |
| Answer» B. ordinary | |
| 6729. |
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. | |
| 6730. |
What is the Laplace transform of sin t ? |
| A. | <img src="/_files/images/chemical-engineering/process-control/341-1-1.png"> |
| B. | <img src="/_files/images/chemical-engineering/process-control/341-1-2.png"> |
| C. | <img src="/_files/images/chemical-engineering/process-control/341-1-3.png"> |
| D. | <img src="/_files/images/chemical-engineering/process-control/341-1-4.png"> |
| Answer» B. <img src="/_files/images/chemical-engineering/process-control/341-1-2.png"> | |
| 6731. |
Working principle of mercury in glass thermometer is |
| A. | volumetric expansion. |
| B. | pressure rise with temperature. |
| C. | linear expansion. |
| D. | none of these. |
| Answer» B. pressure rise with temperature. | |
| 6732. |
The frequency at which maximum amplitude ratio is attained is called the __________ frequency. |
| A. | corner |
| B. | resonant |
| C. | cross-over |
| D. | natural |
| Answer» C. cross-over | |
| 6733. |
Which of the following can measure temperatures in the range of - 20 to 300 C ? |
| A. | Mercury in glass thermometer |
| B. | Vapor pressure thermometer |
| C. | Resistance thermometer |
| D. | None of these. |
| Answer» E. | |
| 6734. |
In second order underdamped system, |
| A. | decay ratio = overshoot |
| B. | decay ratio = (overshoot) |
| C. | <sup>2</sup> |
| D. | overshoot increases for increasing damping co-efficient. |
| E. | large damping co-efficient means smaller damping. |
| Answer» C. <sup>2</sup> | |
| 6735. |
Dome temperature of blast furnace stove is most accurately measured by a |
| A. | radiation pyrometer. |
| B. | platinum-platinum/rhodium ther-mocuple. |
| C. | iron-constantan thermocouple. |
| D. | platinum resistance thermometer. |
| Answer» C. iron-constantan thermocouple. | |
| 6736. |
Phase lag of the sinusoidal response of a first order system is |
| A. | 120 |
| B. | 30 |
| C. | 180 |
| D. | 90 |
| Answer» E. | |
| 6737. |
Continuous measurement of moisture content of paper in paper industry is done by measuring the |
| A. | thermal conductivity through the paper |
| B. | electrical resistance through the paper |
| C. | magnetic susceptibility |
| D. | none of these |
| Answer» C. magnetic susceptibility | |
| 6738. |
Thermal well made of __________ gives the fastest speed of response, while measuring temperature by thermocouples. |
| A. | steel |
| B. | vycor (a glass) |
| C. | nichrome |
| D. | inconel |
| Answer» C. nichrome | |
| 6739. |
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. | |
| 6740. |
The thermal emf-temperature relationship of most thermocouples is |
| A. | linear |
| B. | parabolic |
| C. | exponential |
| D. | square root |
| Answer» C. exponential | |
| 6741. |
In Bode plot, A.R. vs. w is plotted on a/an __________ graph paper. |
| A. | log-lag |
| B. | triangular |
| C. | ordinary |
| D. | semi-log |
| Answer» B. triangular | |
| 6742. |
A first order system with unity gain and time constant is subjected to a sinusoidal input of frequency w = 1/ . The amplitude ratio for this system is |
| A. | 1 |
| B. | 0.5 |
| C. | 1/ |
| D. | <span class="root">2</span> |
| E. | 0.25 |
| Answer» D. <span class="root">2</span> | |
| 6743. |
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 | |
| 6744. |
Which of the following is not a composition measuring instrument ? |
| A. | Thermal conductivity cell |
| B. | Mass spectrometer |
| C. | Polarograph |
| D. | Hot wire anemometer |
| Answer» E. | |
| 6745. |
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 | |
| 6746. |
Which of the following thermocouples is incapable of measuring sub-zero (i.e., < 0 C) temperature ? |
| A. | Chromel-alumel |
| B. | Iron-constantan |
| C. | Platinum-platinum + rhodium |
| D. | Copper-constantan |
| Answer» D. Copper-constantan | |
| 6747. |
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) | |
| 6748. |
A control system has the following transfer functionThe initial value of the corresponding time function is |
| A. | 1 |
| B. | 1/8 |
| C. | 7/8 |
| D. | -1 |
| Answer» B. 1/8 | |
| 6749. |
For measuring the temperature of a red hot furnace, which is the most suitable instrument ? |
| A. | Platinum resistance thermometer |
| B. | Thermocouple |
| C. | Optical pyrometer |
| D. | Bimetallic thermometer |
| Answer» D. Bimetallic thermometer | |
| 6750. |
Continuous measurement of specific gravity of a liquid is done by |
| A. | hydrometer |
| B. | contact-type electric indicators |
| C. | displacement meter |
| D. | both (a) and (c) |
| Answer» E. | |