MCQOPTIONS
Saved Bookmarks
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.
| 1601. |
Fuel for a fast breeder nuclear reactor is |
| A. | plutonium |
| B. | uranium |
| C. | radium |
| D. | neptunium |
| Answer» B. uranium | |
| 1602. |
Which of the following gaseous fuels is likely to have the highest gross calorific value? |
| A. | Sewage gas |
| B. | LPG |
| C. | Producer gas |
| D. | Natural gas |
| Answer» C. Producer gas | |
| 1603. |
The McCabe L law states that the |
| A. | molar heats of vaporisation of components are nearly equal. |
| B. | linear crystal growth rate depends on the degree of supersaturation. |
| C. | linear crystal growth rate does not depend on the crystal size. |
| D. | linear crystal growth rate depends on the crystal size. |
| Answer» D. linear crystal growth rate depends on the crystal size. | |
| 1604. |
Bollman extractor |
| A. | is a static bed leaching equipment. |
| B. | is used for extraction of oil from oilseed. |
| C. | is a centrifugal extractor. |
| D. | employs only counter-current extraction. |
| Answer» C. is a centrifugal extractor. | |
| 1605. |
The relation, Sc = Pr = 1, is valid, when the mechanism of __________ ansfer is same. |
| A. | heat and mass |
| B. | mass and momentum |
| C. | heat and momentum |
| D. | heat, momentum and mass |
| Answer» B. mass and momentum | |
| 1606. |
A coalescer in a mixer-settler liquid-liquid extraction coloumn |
| A. | comprises of thin bed of substances of extended surface having high porosity. |
| B. | helps in increasing the bubble size entering the settler. |
| C. | helps in increasing the settling rate of the bubbles. |
| D. | all 'a', 'b', & 'c'. |
| Answer» E. | |
| 1607. |
For the same feed, feed quality and separation (in a distillation column), with the increase of total pressure, the number of ideal plates will |
| A. | increase |
| B. | decrease |
| C. | remain same |
| D. | data insufficient, can't be predicted |
| Answer» B. decrease | |
| 1608. |
Lignite is |
| A. | a high rank coal. |
| B. | a coking coal. |
| C. | can be used for gasification and steam generation. |
| D. | a black banded coal which burns with a non-smoky yellowish flame. |
| Answer» D. a black banded coal which burns with a non-smoky yellowish flame. | |
| 1609. |
Shatter index of metallurgical coke on 2 inches and 0.5 inch screen should be respectively around __________ percent. |
| A. | 80 and 97 |
| B. | 95 and 100 |
| C. | 40 and 70 |
| D. | 25 and 97 |
| Answer» B. 95 and 100 | |
| 1610. |
Naphthalene recovered from coke oven gas is used |
| A. | as moisture proof coating on fibres. |
| B. | as moth balls (insecticides). |
| C. | as a fuel in furnaces. |
| D. | for making electrodes. |
| Answer» C. as a fuel in furnaces. | |
| 1611. |
Which of the following is a measure of the agglutinating (i.e., binding) property of coal? |
| A. | Thickness of plastic layer |
| B. | Caking index |
| C. | Swelling index |
| D. | Gray-king index |
| Answer» C. Swelling index | |
| 1612. |
Method of maintaining fires in furnace during standby periods without undue consumption of fuel is called |
| A. | back draughting. |
| B. | banking. |
| C. | under pressurising. |
| D. | none of these. |
| Answer» C. under pressurising. | |
| 1613. |
Which of the following can be made into briquettes without the use of a binder ? |
| A. | lignite |
| B. | Bituminous coal |
| C. | Anthracite coal |
| D. | None of these |
| Answer» B. Bituminous coal | |
| 1614. |
As the equilibrium moisture content of the coal increases, its |
| A. | calorific value increases. |
| B. | swelling number decreases. |
| C. | swelling number increases. |
| D. | bulk density decreases. |
| Answer» C. swelling number increases. | |
| 1615. |
During coal carbonisation process, the conversion of semi-coke to coke is accompanied by an increase in the __________ of the mass. |
| A. | density |
| B. | porosity |
| C. | electrical resistivity |
| D. | none of these |
| Answer» B. porosity | |
| 1616. |
Oxygen required for theoretically complete combustion of 1 Nm3 methane is __________ Nm3. |
| A. | 2 |
| B. | 4 |
| C. | 6 |
| D. | 1 |
| Answer» B. 4 | |
| 1617. |
Bomb calorimeter is used for the determination of calorific value of the __________ fuels. |
| A. | gaseous |
| B. | solid |
| C. | liquid |
| D. | both (b) and (c) |
| Answer» E. | |
| 1618. |
Pulverised coal used in boiler firing need not have |
| A. | less moisture content |
| B. | high fusion point of its ash |
| C. | high bulk density |
| D. | lower ash content |
| Answer» C. high bulk density | |
| 1619. |
Which is the most matured coal ? |
| A. | Lignite |
| B. | Bituminous |
| C. | Semi-anthracite |
| D. | Anthracite |
| Answer» E. | |
| 1620. |
The average molecular weight of a flue gas having the composition by volume as CO2 = 25%, O2 = 25%, N2 = 50% will be |
| A. | 27.6 |
| B. | 23 |
| C. | 47.3 |
| D. | 42.9 |
| Answer» C. 47.3 | |
| 1621. |
Caking index of coal blend used for blast furnace coke making is about |
| A. | 8 |
| B. | 12 |
| C. | 22 |
| D. | 36 |
| Answer» D. 36 | |
| 1622. |
Incomplete combustion of a fuel is characterised by the high __________ in the flue gas. |
| A. | smoke |
| B. | temperature |
| C. | oxygen |
| D. | carbon monoxide |
| Answer» E. | |
| 1623. |
Low temperature oxidation of stored coal results in the |
| A. | decrease in its caking power & calorific value. |
| B. | decrease in its carbon & hydrogen content. |
| C. | increase in its oxygen content. |
| D. | all (a), (b) and (a). |
| Answer» E. | |
| 1624. |
Washing of coal |
| A. | reduces its ash & sulphur content. |
| B. | improves its coking properties. |
| C. | increase the fusion point of its ash by removing chlorine compounds. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 1625. |
During coking of coal, the ash content (percentage) |
| A. | increases |
| B. | decreases |
| C. | remains constant |
| D. | - |
| Answer» B. decreases | |
| 1626. |
Furnace oil consumption in a furnace for a given duty employing preheated combination air (at 300 ) may be reduced by about __________ percent as compared to the use of atmospheric combustion air. |
| A. | 5 |
| B. | 10 |
| C. | 20 |
| D. | 35 |
| Answer» D. 35 | |
| 1627. |
Bulk density of pulverised coal may be about __________ kg/m3. |
| A. | 100 |
| B. | 500 |
| C. | 1000 |
| D. | 1500 |
| Answer» C. 1000 | |
| 1628. |
The main reason for making the copper calorimeter (used in bomb calorimeter) silvery white and shining/polished is to |
| A. | minimise its corrosion. |
| B. | avoid radiation heat loss. |
| C. | make it look attractive. |
| D. | none of these. |
| Answer» C. make it look attractive. | |
| 1629. |
The weathering index of a coal |
| A. | gives an idea of the fusion temperature of ash. |
| B. | is related to its calorific value. |
| C. | is a measure of its size stability, when stored & exposed to weather. |
| D. | is a measure of its caking tendency. |
| Answer» D. is a measure of its caking tendency. | |
| 1630. |
Bright coal |
| A. | contains more than 90% durain. |
| B. | contains more than 90% fussain. |
| C. | contains mainly vitrain & clarain and is generally coking. |
| D. | is non-coking. |
| Answer» D. is non-coking. | |
| 1631. |
Which of the following is a primary fuel ? |
| A. | Blast furnace coke |
| B. | Gasoline |
| C. | Natural gas |
| D. | Wood charcoal |
| Answer» D. Wood charcoal | |
| 1632. |
Combustion of pulverised coal compared to the lumpy coal |
| A. | provides better control of furnace temperature. |
| B. | facilitates combustion with lower excess air. |
| C. | provides higher thermal efficiency & flame temperature. |
| D. | all (a), (b) & (c). |
| Answer» E. | |
| 1633. |
The ratio of % total carbon obtained in the ultimate analysis of coke and % fixed carbon obtained in the proximate analysis is always |
| A. | 1 |
| B. | < 1 |
| C. | > 1 |
| D. | unpredictable |
| Answer» D. unpredictable | |
| 1634. |
A coal with high __________ content, would ignite most easily. |
| A. | fixed carbon |
| B. | volatile matter |
| C. | ash |
| D. | oxygen |
| Answer» C. ash | |
| 1635. |
Which of the following is a single stage, fixed bed high pressure coal gasification process ? |
| A. | Winkler process |
| B. | Kopper-Totzek process |
| C. | Lurgi Process |
| D. | None of these |
| Answer» D. None of these | |
| 1636. |
Kopper-Totzek coal gasifier (installed in a coal based nitrogeneous fertiliser plant) employs a/an __________ bed gasifier. |
| A. | entrained |
| B. | moving |
| C. | fixed |
| D. | fluidised |
| Answer» B. moving | |
| 1637. |
In flue gas analysis by Orsat's apparatus, carbon monoxide is absorbed by |
| A. | cuprous chloride |
| B. | potassium hydroxide |
| C. | alkaline pyrogallol solution |
| D. | none of these. |
| Answer» B. potassium hydroxide | |
| 1638. |
A good solvent used for absorption should not have very high |
| A. | viscosity |
| B. | vapor pressure |
| C. | freezing point |
| D. | all (a), (b) & (c) |
| Answer» E. | |
| 1639. |
In a counter-current liquid extractor |
| A. | both liquids flow at fixed rate. |
| B. | both liquids can have any desired flow rate. |
| C. | only one of the liquids may be pumped at any desired rate. |
| D. | liquid's flow rate depends upon the temperature and pressure. |
| Answer» D. liquid's flow rate depends upon the temperature and pressure. | |
| 1640. |
Which of the following is an undesirable property for an absorbing solvent ? |
| A. | Low vapour pressure |
| B. | Low velocity |
| C. | Low freezing point |
| D. | None of these |
| Answer» E. | |
| 1641. |
The wetted wall tower is used to determine |
| A. | individual mass transfer co-efficient (M.T.C.) in gaseous system. |
| B. | M.T.C. of individual components in a liquid-liquid system. |
| C. | M.T.C. of liquid in liquid-gas system. |
| D. | the overall M.T.C. of the system. |
| Answer» B. M.T.C. of individual components in a liquid-liquid system. | |
| 1642. |
Weight of 1 m3 of humid air as compared to 1 m3 of dry air, under the same conditions, is |
| A. | less |
| B. | more |
| C. | same |
| D. | unpredictable |
| Answer» B. more | |
| 1643. |
For achieving rapid drying rate in a spray dryer, the diameter of the particles in the feed should be in the range of __________ microns (1 mm = 1000 microns). |
| A. | 1-5 |
| B. | 10-60 |
| C. | 200-300 |
| D. | > 500 |
| Answer» C. 200-300 | |
| 1644. |
For absorbing a sparingly soluble gas in a liquid |
| A. | gas side mass transfer co-efficient should be increased. |
| B. | liquid side mass transfer co-efficient should be increased. |
| C. | liquid side mass transfer co-efficient should be decreased. |
| D. | mass transfer co-efficient must be kept constant. |
| Answer» C. liquid side mass transfer co-efficient should be decreased. | |
| 1645. |
Channelling in a packed tower results from the |
| A. | high pressure drop |
| B. | maldistribution of liquid |
| C. | non-uniformity of packing |
| D. | both (b) and (c) |
| Answer» E. | |
| 1646. |
The change in enthalpy per unit weight of adsorbed gas when adsorbed on gas free or "outgassed" adsorbent to from a definite concentration of adsorbate is called its |
| A. | integral heat of adsorption. |
| B. | heat of wetting. |
| C. | differential heat of adsorption. |
| D. | heat of normal condensation. |
| Answer» B. heat of wetting. | |
| 1647. |
The minimum number of theoretical plates is required for achieving a given separation in distillation column with |
| A. | no reflux |
| B. | total reflux |
| C. | zero reflux ratio |
| D. | minimum reflux ratio |
| Answer» C. zero reflux ratio | |
| 1648. |
Percentage saturation is __________ the relative saturation. |
| A. | always smaller than |
| B. | always greater than |
| C. | not related to |
| D. | none of these |
| Answer» B. always greater than | |
| 1649. |
In case of a desorber (stripper), the |
| A. | operating line always lies above the equilibrium curve. |
| B. | operating line always lies below the equilibrium curve. |
| C. | temperature remains unaffected. |
| D. | temperature always increases. |
| Answer» C. temperature remains unaffected. | |
| 1650. |
What is the reflux ratio at total reflux ? |
| A. | Zero |
| B. | Infinity |
| C. | Unity |
| D. | Data insufficient |
| Answer» C. Unity | |