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.
| 651. |
In a second order under damped system, the |
| A. | time required for the response of first reach its ultimate value is called the response time. |
| B. | overshoot (which is a measure of how much the response exceeds the ultimate value) increase with the decrease of damping co-efficient e. |
| C. | decay ratio (which is the ratio of the sizes of successive peaks) is equal to the reciprocal of overshoot. |
| D. | characteristics of a step response is represented by |
| Answer» C. decay ratio (which is the ratio of the sizes of successive peaks) is equal to the reciprocal of overshoot. | |
| 652. |
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. | |
| 653. |
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 | |
| 654. |
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 | |
| 655. |
Which of the following thermocouples is capable of measuring a temperature of -50°C?$ |
| A. | Platinum - platinum + rhodium |
| B. | Chromel - alumel |
| C. | Iron-constantan |
| D. | Copper - constantan |
| Answer» B. Chromel - alumel | |
| 656. |
__________ controller has the maximum stabilising time. |
| A. | P |
| B. | PD |
| C. | PI |
| D. | PID |
| Answer» D. PID | |
| 657. |
Meleoid gauge measures the __________ pressure. |
| A. | positive |
| B. | sub-atmospheric |
| C. | very high |
| D. | atmospheric |
| Answer» C. very high | |
| 658. |
An aneroid barometer measures the __________ pressure. |
| A. | atmospheric |
| B. | absolute |
| C. | vacuum |
| D. | gage |
| Answer» C. vacuum | |
| 659. |
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 | |
| 660. |
Composition of alloys can be determined by |
| A. | polarograph |
| B. | chromatograph |
| C. | refractrometer |
| D. | none of these |
| Answer» B. chromatograph | |
| 661. |
Gain margin is equal to the |
| A. | amplitude ratio |
| B. | reciprocal of amplitude ratio |
| C. | gain in P controller |
| D. | gain in P-I controller |
| Answer» C. gain in P controller | |
| 662. |
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 | |
| 663. |
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 | |
| 664. |
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. | ‚àû |
| Answer» E. | |
| 665. |
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. | |
| 666. |
Mercury thermometer can be used to measure the temperature upto __________ °C.$ |
| A. | 100 |
| B. | 250 |
| C. | 350 |
| D. | 750 |
| Answer» D. 750 | |
| 667. |
On-off controllers are normally used for |
| A. | low loads |
| B. | temperature changes |
| C. | flow rate changes |
| D. | none of these |
| Answer» B. temperature changes | |
| 668. |
__________ thermometer can not measure sub-zero (< 0° C) temperature,$ |
| A. | Mercury in glass |
| B. | Bimetallic |
| C. | Vapor pressure |
| D. | Resistance |
| Answer» C. Vapor pressure | |
| 669. |
The deflection of the free end of the bimetallic strips in a bimetallic thermometer with temperature is nearly |
| A. | linear |
| B. | non-linear |
| C. | parabolic |
| D. | hyperbolic |
| Answer» B. non-linear | |
| 670. |
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 | |
| 671. |
Routh stability method uses __________ loop transfer function. |
| A. | open |
| B. | closed |
| C. | either (a) or (b) |
| D. | neither (a) nor (b) |
| Answer» C. either (a) or (b) | |
| 672. |
Which of the following is not classified as a thermo electric pyrometer ? |
| A. | Resistance thermometer. |
| B. | Thermocouple. |
| C. | Optical pyrometer (disappearing filament type) |
| D. | Radiation pyrometer |
| Answer» D. Radiation pyrometer | |
| 673. |
Humidity of air can be determined by a |
| A. | chromatograph |
| B. | sling psychrometer |
| C. | mass spectrometer |
| D. | polarimeter |
| Answer» C. mass spectrometer | |
| 674. |
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 | |
| 675. |
Temperature measurement range of iron-constantan thermocouple is 0 to 870°C. It can be used to measure sub zero temperature, because at lower temperature$ |
| A. | emf produced is very low of the order of microvolt. |
| B. | embrittlement of iron occurs. |
| C. | rusting of iron takes place. |
| D. | both (b) and (c). |
| Answer» E. | |
| 676. |
The calibration data of a thermocouple with its cold junction at 0°C are given below.The hot junction of the thermocouple is placed in a bath at 80°C, while its cold junction is at 20°C. What is the emf of thermocouple ?$ |
| A. | 3.26 mv |
| B. | 0.80 mv |
| C. | 2.46 mv |
| D. | 2.43 mv |
| Answer» D. 2.43 mv | |
| 677. |
Silver point temperature is __________ °C.$ |
| A. | 760.5 |
| B. | 860.5 |
| C. | 960.5 |
| D. | 1060.5 |
| Answer» D. 1060.5 | |
| 678. |
Optical activity of a solution can be determined using a |
| A. | polarimeter |
| B. | polarograph |
| C. | dilatometer |
| D. | refractrometer |
| Answer» B. polarograph | |
| 679. |
Which of the following is a 'contact' pyrometer ? |
| A. | resistance pyrometer |
| B. | optical pyrometer |
| C. | radiation pyrometer |
| D. | infra red pyrometer |
| Answer» B. optical pyrometer | |
| 680. |
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 | |
| 681. |
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 | |
| 682. |
Specific conductance is defined as the reciprocal of resistance in ohms of 1c.c. of liquid at a specified temperature. Its value for distilled water is about __________ micro mho/cm3. |
| A. | 50 |
| B. | 100 |
| C. | 10 |
| D. | 1 |
| Answer» E. | |
| 683. |
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 | |
| 684. |
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 | |
| 685. |
The amplitude ratio for the sinusoidal response of __________ is < 1. |
| A. | transportation lag |
| B. | first order system |
| C. | second order system |
| D. | none of these |
| Answer» C. second order system | |
| 686. |
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 | |
| 687. |
Concentration of sugar solution can be determined by the |
| A. | polarimetry |
| B. | flame photometry |
| C. | emission spectroscopy |
| D. | oscillometry |
| Answer» B. flame photometry | |
| 688. |
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 | |
| 689. |
Stalagmometer is used for the measurement of |
| A. | kinematic viscosity |
| B. | surface tension |
| C. | refractive index |
| D. | optical activity |
| Answer» C. refractive index | |
| 690. |
All the thermocouples used for temperature measurement use dissimilar metal |
| A. | strips |
| B. | bars |
| C. | wires |
| D. | beads |
| Answer» D. beads | |
| 691. |
Liquid argon level in a pressurised storage tank (at 3 kg/cm2 ) is measured by a/an |
| A. | gage glass |
| B. | external float gage |
| C. | differential pressure gage |
| D. | none of these |
| Answer» D. none of these | |
| 692. |
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 | |
| 693. |
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 | |
| 694. |
Configuration of Bourdon spring tube is never made of __________ shape. |
| A. | circular |
| B. | semi-circular |
| C. | helical |
| D. | spiral |
| Answer» B. semi-circular | |
| 695. |
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 | |
| 696. |
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 | |
| 697. |
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 | |
| 698. |
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 | |
| 699. |
For the block diagram shown below :The characteristic equation is |
| A. | τl S (τps + 1) + Kc . Kp (τlS + 1) e-τd s = 0 |
| B. | (τmS + 1) (τpS + 1) + Km . Kp e-τd S = 0 |
| C. | τl S(τm S + 1) (τp S + 1) +Kc . Kp . Km (τl s + 1) e-τdS = 0 |
| D. | (τms + 1) (τp s + 1) + Kc . Kp . Km . e-τdS = 0 |
| Answer» D. (œÑms + 1) (œÑp s + 1) + Kc . Kp . Km . e-œÑdS = 0 | |
| 700. |
__________ 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 | |