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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.
| 6801. |
A bimetallic thermometer as compared to industrial mercury in glass thermometer has almost the same |
| A. | temperature measuring range (- 40 C to 450 C). |
| B. | accuracy ( 1% of span). |
| C. | speed of response. |
| D. | all a, b & c. |
| Answer» E. | |
| 6802. |
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 | |
| 6803. |
Concentration of sugar solution can be determined by the |
| A. | polarimetry |
| B. | flame photometry |
| C. | emission spectroscopy |
| D. | oscillometry |
| Answer» B. flame photometry | |
| 6804. |
In a single tank system, the transfer function of __________ to inlet flow rate is 1/TS+1. |
| A. | outlet flow rate |
| B. | level |
| C. | both (a) & (b) |
| D. | neither (a) nor (b) |
| Answer» B. level | |
| 6805. |
Which of the following can not measure a temperature of 1600 C ? |
| A. | Platinum resistance thermometer |
| B. | Thermocouple |
| C. | Photo-electric pyrometer |
| D. | Radiation pyrometer |
| Answer» B. Thermocouple | |
| 6806. |
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 | |
| 6807. |
"A control system is unstable, if the open loop frequency response exhibits an amplitude ratio exceeding unity at the crossover frequency." This is __________ criterion. |
| A. | Bode stability |
| B. | Nyquist |
| C. | Routh stability |
| D. | none of these |
| Answer» B. Nyquist | |
| 6808. |
Feed forward controller accounts for the __________ changes. |
| A. | set point |
| B. | load |
| C. | both (a) & (b) |
| D. | neither (a) nor (b) |
| Answer» C. both (a) & (b) | |
| 6809. |
Which thermocouple can be used to measure a temperature of around 1400 C ? |
| A. | Copper-constantan |
| B. | Aluminium-chromel |
| C. | Platinum-platinum+rhodium |
| D. | None of these |
| Answer» D. None of these | |
| 6810. |
Resistance of a gas in a vessel is given by (where, P = pressure, V = volume of the vessel, n = no. of moles of the gas, R = gas constant) |
| A. | <img src="/_files/images/chemical-engineering/process-control/345-65-1.png"> |
| B. | <img src="/_files/images/chemical-engineering/process-control/345-65-2.png"> |
| C. | <img src="/_files/images/chemical-engineering/process-control/345-65-3.png"> |
| D. | <img src="/_files/images/chemical-engineering/process-control/345-65-4.png"> |
| Answer» B. <img src="/_files/images/chemical-engineering/process-control/345-65-2.png"> | |
| 6811. |
Measurement of pressure in ammonia reactor is done by |
| A. | Bourdon gauge |
| B. | U-tube manometer |
| C. | Inclined tube manometer |
| D. | Pirani guage |
| Answer» B. U-tube manometer | |
| 6812. |
The fluid used in hydraulic controller is |
| A. | water |
| B. | steam |
| C. | air |
| D. | oil |
| Answer» E. | |
| 6813. |
Flow rate of a river is measured by a/an |
| A. | pitot tube |
| B. | vane meter |
| C. | kennison nozzle |
| D. | open weir |
| Answer» C. kennison nozzle | |
| 6814. |
Which of the following thermocouple materials does not contain nickel ? |
| A. | Alumel |
| B. | Chromel |
| C. | Constantan |
| D. | None of these. |
| Answer» E. | |
| 6815. |
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 | |
| 6816. |
Configuration of Bourdon spring tube is never made of __________ shape. |
| A. | circular |
| B. | semi-circular |
| C. | helical |
| D. | spiral |
| Answer» B. semi-circular | |
| 6817. |
Thermodynamic celcius scale of temperature measurement is |
| A. | defined on the basis of melting point of ice and evaporation temperature of water vapor. |
| B. | defined on the basis of melting point of ice and condensation temperature of water vapor. |
| C. | having an interval of 100 between ice point to steam point. |
| D. | both (b) and (c) |
| Answer» E. | |
| 6818. |
According to Bode stability criterian, a system is unstable, if the open loop frequency response exhibits an amplitude ratio exceeding unity at frequency for which phase lag is |
| A. | 0 |
| B. | 45 |
| C. | 90 |
| D. | 180 |
| Answer» E. | |
| 6819. |
In a closed loop system, the process to be controlled is an integrating process with transfer function l/2s. The controller proposed to be used in an integral controller with transfer function 1/T1s. When a step change in set point is applied to such a closed loop system, the controlled variable will exhibit |
| A. | overdamped response. |
| B. | underdamped response. |
| C. | undamped response. |
| D. | unstable response. |
| Answer» C. undamped response. | |
| 6820. |
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. | |
| 6821. |
Nitrogen gas constant volume thermometer is suitable for measuring a temperature of __________ C. |
| A. | 0-100 |
| B. | < 0 |
| C. | > 100. |
| D. | > 50 |
| Answer» D. > 50 | |
| 6822. |
Range of hydrogen gas constant volume themometer is __________ C. |
| A. | -10 to 20 |
| B. | 0 to 100 |
| C. | 100 - 500 |
| D. | 400 - 1000 |
| Answer» C. 100 - 500 | |
| 6823. |
The initial value (t=0) of the unit step response of the transfer function [(s + 1)/(2s + 1)] is |
| A. | 0 |
| B. | 1/2 |
| C. | 1 |
| D. | 2 |
| Answer» C. 1 | |
| 6824. |
The __________ of a vapor pressure thermometer is a primary element. |
| A. | pointer |
| B. | Bourdon tube |
| C. | bulb |
| D. | none of these |
| Answer» D. none of these | |
| 6825. |
The time constant of a first order process with resistance R and capacitance C is |
| A. | R + C |
| B. | R - C |
| C. | RC |
| D. | 1/RC |
| Answer» D. 1/RC | |
| 6826. |
Thermocouple in a thermal well behaves as a true |
| A. | first order system. |
| B. | second order system (overdamped). |
| C. | multiple first order system. |
| D. | second order system (underdamped). |
| Answer» D. second order system (underdamped). | |
| 6827. |
Working principle of disappearing filament type optical pyrometer is based on the |
| A. | Wien's law |
| B. | Seebeck effect |
| C. | Kirchoff's law |
| D. | Peltier effect |
| Answer» B. Seebeck effect | |
| 6828. |
Strain gage uses an electrical conductor wire, which when elastically stretched increases in length and reduces in diameter. Both these dimensional changes result in __________ in the electrical resistance of the wire. |
| A. | no change |
| B. | decrease |
| C. | increase |
| D. | exponential decrease |
| Answer» D. exponential decrease | |
| 6829. |
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. | |
| 6830. |
Liquid flow rate in a small channel is best measured by a/an |
| A. | weir |
| B. | pitot tube |
| C. | vane meter |
| D. | venturimeter |
| Answer» C. vane meter | |
| 6831. |
The transfer function of a first order system is |
| A. | <img src="/_files/images/chemical-engineering/process-control/341-2-1.png"> |
| B. | <img src="/_files/images/chemical-engineering/process-control/341-2-2.png"> |
| C. | <img src="/_files/images/chemical-engineering/process-control/341-2-3.png"> |
| D. | none of these |
| Answer» B. <img src="/_files/images/chemical-engineering/process-control/341-2-2.png"> | |
| 6832. |
Composition of alloys can be determined by |
| A. | polarograph |
| B. | chromatograph |
| C. | refractrometer |
| D. | none of these |
| Answer» B. chromatograph | |
| 6833. |
Optical activity of a solution can be determined using a |
| A. | polarimeter |
| B. | polarograph |
| C. | dilatometer |
| D. | refractrometer |
| Answer» B. polarograph | |
| 6834. |
Stability of a control system containing a transportation lag can be best analysed by |
| A. | Routh test |
| B. | root locus methods |
| C. | frequency response methods |
| D. | none of these |
| Answer» D. none of these | |
| 6835. |
Stabilising time for the controllers is the time required for the response to reach __________ percent of its ultimate value. |
| A. | 63.2 |
| B. | 87.5 |
| C. | 95 |
| D. | 100 |
| Answer» D. 100 | |
| 6836. |
Number of poles in a system with transfer function is |
| A. | 2 |
| B. | 5 |
| C. | 3 |
| D. | 1 |
| Answer» D. 1 | |
| 6837. |
Radiation thermometer can not measure the temperature |
| A. | inside a pressure vessel. |
| B. | of an object without coming in contact with it. |
| C. | of liquid oxygen. |
| D. | of moving objects at high temperature. |
| Answer» D. of moving objects at high temperature. | |
| 6838. |
Temperature measurement by optical pyrometer is done above __________ point, which is 1063 C. |
| A. | antimony |
| B. | gold |
| C. | silver |
| D. | nickel |
| Answer» C. silver | |
| 6839. |
Dilatometer is used to measure |
| A. | stress |
| B. | strain |
| C. | deflection |
| D. | contraction/expansion due to changes in temperature |
| Answer» E. | |
| 6840. |
Emf generated in a thermocouple depends on the temperature |
| A. | of cold junction only. |
| B. | of hot junction only. |
| C. | difference between hot and cold junctions. |
| D. | difference between cold junction and atmospheric temperature. |
| Answer» D. difference between cold junction and atmospheric temperature. | |
| 6841. |
Working principle of mercury in glass thermometer is based on the __________ of mercury with increase in temperature. |
| A. | increase of pressure |
| B. | increase of thermal conductivity |
| C. | volumetric expansion |
| D. | differential linear expansion |
| Answer» D. differential linear expansion | |
| 6842. |
The Laplace transform of a sinusoidal function (eg; sin at) is represented by the curve |
| A. | <img src="/_files/images/chemical-engineering/process-control/368-433-1.png"> |
| B. | <img src="/_files/images/chemical-engineering/process-control/368-433-2.png"> |
| C. | <img src="/_files/images/chemical-engineering/process-control/368-433-3.png"> |
| D. | <img src="/_files/images/chemical-engineering/process-control/368-433-4.png"> |
| Answer» B. <img src="/_files/images/chemical-engineering/process-control/368-433-2.png"> | |
| 6843. |
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. | |
| 6844. |
To increase the speed of response of a pressure spring liquid or gas expansion thermometer, the clearance space between the thermometer bulb and the thermal well should not be filled with |
| A. | air |
| B. | a metal powder or graphite |
| C. | oil |
| D. | mercury |
| Answer» B. a metal powder or graphite | |
| 6845. |
In an exothermic chemical reactor, the manipulated variable is the flow rate of |
| A. | coolant |
| B. | reactants |
| C. | product |
| D. | none of these |
| Answer» B. reactants | |
| 6846. |
Very low pressure is expressed in microns( ), which is equal to __________ mm of Hg coloumn (absolute) at 0 C. |
| A. | 0.0001 |
| B. | 0.001 |
| C. | 0.01 |
| D. | 0.1 |
| Answer» C. 0.01 | |
| 6847. |
A typical example of a physical system with under damped characteristic is a |
| A. | U-tube manometer. |
| B. | spring loaded diaphragm valve. |
| C. | CSTR with first order reaction. |
| D. | thermocouple kept immersed in a liquid filled thermowell. |
| Answer» C. CSTR with first order reaction. | |
| 6848. |
An aneroid barometer measures the __________ pressure. |
| A. | atmospheric |
| B. | absolute |
| C. | vacuum |
| D. | gage |
| Answer» C. vacuum | |
| 6849. |
A bolometer is |
| A. | used for the measurement of thermal radiation. |
| B. | an element which senses optical input and delivers thermal output. |
| C. | both (a) & (b). |
| D. | neither (a) nor (b). |
| Answer» D. neither (a) nor (b). | |
| 6850. |
Thermal wells are used in the temperature measurement to |
| A. | guard against corrosive and oxidising action on thermocouple materials |
| B. | reduce measuring lag. |
| C. | increase the fidelity. |
| D. | increase the sensitivity. |
| Answer» B. reduce measuring lag. | |