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.
| 3951. |
Hardgrove grindability index of four coal samples are given below. Which of them is the easiest to grind ? |
| A. | 50 |
| B. | 70 |
| C. | 85 |
| D. | 100 |
| Answer» E. | |
| 3952. |
Which is the heaviest fuel gas out of the following ? |
| A. | Blast furnace gas |
| B. | Coke oven gas |
| C. | Water gas |
| D. | Carburetted water gas |
| Answer» B. Coke oven gas | |
| 3953. |
Octane number of 2, 2, 4 - trimethyl pen-tane is |
| A. | 0 |
| B. | 100 |
| C. | in between 0 and 100 |
| D. | more than 100 |
| Answer» C. in between 0 and 100 | |
| 3954. |
Coke ovens in steel plant are heated by |
| A. | electricity |
| B. | coke oven gas |
| C. | mixed gas |
| D. | both(b) & (c) |
| Answer» E. | |
| 3955. |
Coke oven gas is a better fuel than blast furnace gas, because of its higher |
| A. | calorific value, cleanliness and relatively low distribution cost (due to its low specific gravity). |
| B. | adiabatic flame temperature. |
| C. | heat release rate (thus requiring smaller combustion chamber). |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 3956. |
Short/intense flame is produced during combustion of gaseous fuel by using |
| A. | high amount/current of combustion air. |
| B. | low amount/current of combustion air. |
| C. | preheated secondary air. |
| D. | very little excess air. |
| Answer» B. low amount/current of combustion air. | |
| 3957. |
With increase in calorific value of fuels, their adiabatic flame temperatures |
| A. | increase |
| B. | decrease |
| C. | remain unchanged |
| D. | may increase or decrease ; depends on the quantity of products of combustion |
| Answer» E. | |
| 3958. |
Coal tar fuel - 200 (CTF 200) is a mixture of |
| A. | pitch and creosote oil. |
| B. | light oil and pitch. |
| C. | anthracene and crecosote oil. |
| D. | solar oil and pitch. |
| Answer» B. light oil and pitch. | |
| 3959. |
Calorific value of coke even gas produced by low temperature carbonisation of coal is about __________ Kcal/Nm3. |
| A. | 4000 |
| B. | 2500 |
| C. | 6500 |
| D. | 10000 |
| Answer» D. 10000 | |
| 3960. |
High pressure coal gasification is employed in __________ process. |
| A. | Lurgi |
| B. | Kopper-Totzek |
| C. | Winkler |
| D. | none of these |
| Answer» B. Kopper-Totzek | |
| 3961. |
Flue gas from the heating chamber of byproduct coke ovens is removed by |
| A. | forced draft fan |
| B. | induced draft fan |
| C. | steam ejector |
| D. | natural draft |
| Answer» E. | |
| 3962. |
Which of the following would require maximum amount of % excess air for complete combustion ? |
| A. | Coke oven gas |
| B. | Furnace oil |
| C. | Pulverised coal |
| D. | Lump coal (fixed on chain grate). |
| Answer» E. | |
| 3963. |
During combustion of a gaseous fuel, the presence of a non-luminous flame is an indication of the |
| A. | incomplete combustion. |
| B. | complete combustion. |
| C. | high oxygen in flue gas. |
| D. | none of these. |
| Answer» C. high oxygen in flue gas. | |
| 3964. |
Low temperature oxidation of coal is accelerated by the |
| A. | storage in large heaps. |
| B. | storage in compressed piles. |
| C. | absence of porous or friable particles. |
| D. | all (a), (b) and (c). |
| Answer» B. storage in compressed piles. | |
| 3965. |
Preheating of __________ the flame temperature. |
| A. | the gaseous fuel before combustion decreases |
| B. | combustion air decreases |
| C. | either the fuel or the air or both, increases |
| D. | either the fuel or the air does not affect. |
| Answer» D. either the fuel or the air does not affect. | |
| 3966. |
Which adsorbant is used for removing sulphur compounds (S Q, H2S, RSH etc.) removal from coke oven gas in by-products recovery plant ? |
| A. | Silica gel |
| B. | Diatomaceous earth |
| C. | Basalt |
| D. | Bog iron (i.e., moist ferric hydroxide) |
| Answer» E. | |
| 3967. |
Temperature of coke oven gas just before entering into saturator (for recovery of NH3) is about __________ C. |
| A. | 30 |
| B. | 65 |
| C. | 120 |
| D. | 180 |
| Answer» C. 120 | |
| 3968. |
Calorific value of tar is about __________ Kcal/kg. |
| A. | 8800 |
| B. | 12000 |
| C. | 5000 |
| D. | 16000 |
| Answer» B. 12000 | |
| 3969. |
Tolerable concentration of toxic carbon monoxide in atmospheric air is about __________ PPm. |
| A. | 50 |
| B. | 1000 |
| C. | 5000 |
| D. | 10000 |
| Answer» B. 1000 | |
| 3970. |
Which of the following is not applicable to fluidised bed combustion of coal ? |
| A. | It can not burn low grade coal. |
| B. | It achieves higher fuel combustion efficiency. |
| C. | Less heat transfer surface area is required in boilers. |
| D. | None of these. |
| Answer» B. It achieves higher fuel combustion efficiency. | |
| 3971. |
Coal containing large quantity of __________ are difficult to wash. |
| A. | ash |
| B. | inherent mineral matter |
| C. | free impurities |
| D. | volatile matter |
| Answer» C. free impurities | |
| 3972. |
Which of the following is not a micro component present in coal ? |
| A. | Micrinite |
| B. | Clarain |
| C. | Fusinite |
| D. | Liptinite |
| Answer» C. Fusinite | |
| 3973. |
Calorific values of both the solid as well as the liquid fuels can be determined by __________ calorimeter. |
| A. | bomb |
| B. | Boy's |
| C. | Junkar's |
| D. | none of these |
| Answer» B. Boy's | |
| 3974. |
Pick out the wrong statement pertaining to the design of the bubble cap tray of a distillation column to give stable operation and even vapour distribution. |
| A. | The pressure drop due to the caps & slots and the static submergence should be as high as practicable for reasonable operation. |
| B. | Tendency towards stable operation is increased by increasing the skirt clearance of the caps, lowering the rate of liquid flow per unit plate width or increasing the spacing between the caps. |
| C. | The dimensionless ratio of liquid gradient to pressure drop head caused by the bubble cap assembly should be less than 0.4. |
| D. | none of these. |
| Answer» E. | |
| 3975. |
Speed of the drum of the rotary vacuum filter normally ranges from __________ rpm. |
| A. | 0.1 to 2 |
| B. | 5 to 7 |
| C. | 3 to 8 |
| D. | 8 to 15 |
| Answer» B. 5 to 7 | |
| 3976. |
A stuffing box is used for |
| A. | absorbing the contraction/expansion of pipeline due to temperature changes. |
| B. | prevention of fluid leakage around moving parts. |
| C. | facilitating smooth opening and closing of a valve. |
| D. | reducing the resistance of fluid flow. |
| Answer» C. facilitating smooth opening and closing of a valve. | |
| 3977. |
Pick out the wrong statement.In an agitated vertical cylinderical reaction vessel, the |
| A. | ratio of liquid depth to tank diameter (i.e. the filling ratio) recommended for most purposes is 1. |
| B. | filling ratio for dispersing gas in a liquid is 2 for sufficiently long contact period. |
| C. | flat bottom and conical bottom vessels have low agitation efficiency for agitation of heavy solids in liquids. |
| D. | dished bottom vessel has very high power consumption. |
| Answer» E. | |
| 3978. |
The ends of a cylinderical vessel can be closed by a head, which can be one of the four shapes. For the same thickness, choose the one which can withstand the highest pressure. |
| A. | Flat plate |
| B. | Hemispherical |
| C. | Torispherical |
| D. | Ellipsoidal |
| Answer» E. | |
| 3979. |
Wall thickness of schedule 40 pipe as compared to that of schedule 80 pipe is |
| A. | more |
| B. | less |
| C. | same |
| D. | cither (a) or (b); depends upon the I.D. of the pipe |
| Answer» C. same | |
| 3980. |
Pick out the wrong statement pertaining to the design of a basket type evaporator. |
| A. | It is used for high viscosity liquor having large rate of scaling. |
| B. | The tube bundle is suspended on bracket. |
| C. | There is no central downtake. |
| D. | Downtake is formed by the annular space between the bundle and the shell. |
| Answer» B. The tube bundle is suspended on bracket. | |
| 3981. |
__________ tray arrangement is recommended for distillation column having diameter upto 4 ft. |
| A. | Radial flow |
| B. | Cross flow |
| C. | Split flow |
| D. | Cascade |
| Answer» C. Split flow | |
| 3982. |
What is the value of 'q' for saturated liquid feed to a distillation column ? |
| A. | 0 |
| B. | <1 |
| C. | 1 |
| D. | >1 |
| Answer» D. >1 | |
| 3983. |
In perforated plate towers, the |
| A. | hole sizes may be around 1/8" or 3/16". |
| B. | total hole area may be around 6 to 15% of tower cross-sectional area. |
| C. | pressure drop is less compared is similar bubble cap towers. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 3984. |
The main purpose of providing stepping on the trays is to |
| A. | increase the residence time. |
| B. | decrease the pressure drop. |
| C. | facilitate handling of large flow rate of liquid. |
| D. | improve the flow condition. |
| Answer» D. improve the flow condition. | |
| 3985. |
Remote control valve is a __________ valve. |
| A. | gate |
| B. | butterfly |
| C. | needle |
| D. | globe |
| Answer» C. needle | |
| 3986. |
Which of the following quantities are computed by using the hydraulic radius for non-circular ducts ? |
| A. | Velocity and relative roughness. |
| B. | Head loss and velocity. |
| C. | Reynold number, relative roughness and head loss. |
| D. | Reynolds number and friction factor. |
| Answer» D. Reynolds number and friction factor. | |
| 3987. |
Centre of pressure in an immersed body is __________ the centre of gravity. |
| A. | above |
| B. | below |
| C. | at |
| D. | either above or below; depends on the liquid density |
| Answer» C. at | |
| 3988. |
Pick out the Hagen-Poiseulle's equation. |
| A. | <img src="/_files/images/chemical-engineering/fluid-mechanics/13-174-1.png"> |
| B. | <img src="/_files/images/chemical-engineering/fluid-mechanics/13-174-2.png"> |
| C. | <img src="/_files/images/chemical-engineering/fluid-mechanics/13-174-3.png"> |
| D. | <img src="/_files/images/chemical-engineering/fluid-mechanics/13-174-4.png"> |
| Answer» C. <img src="/_files/images/chemical-engineering/fluid-mechanics/13-174-3.png"> | |
| 3989. |
Boundary layer separation is caused by the |
| A. | reduction of pressure to vapour pressure. |
| B. | boundary layer thickness reducing to zero. |
| C. | adverse pressure gradient. |
| D. | reduction of pressure gradient to zero. |
| Answer» D. reduction of pressure gradient to zero. | |
| 3990. |
With increase in temperature, the vapor pressure of liquids |
| A. | increases |
| B. | increases linearly |
| C. | decreases |
| D. | remains constant |
| Answer» B. increases linearly | |
| 3991. |
A mono pump is a __________ pump. |
| A. | centrifugal |
| B. | piston |
| C. | positive acting rotary |
| D. | a group of vacuum |
| Answer» D. a group of vacuum | |
| 3992. |
Higher specific speed (200-500) of a centrifugal pump indicates that the pump is of __________ flow type. |
| A. | axial |
| B. | radial |
| C. | mixed |
| D. | none of these |
| Answer» B. radial | |
| 3993. |
The variable required to be known in correlations used for estimating the horse power of a centrifugal gas compressor and hence its cost are P. Inlet pressure Q. Compressor rpm R. Delivery pressure S. Volumetric flow rate at inlet. |
| A. | P, Q and R |
| B. | P and R |
| C. | R and S |
| D. | P, Rand S |
| Answer» B. P and R | |
| 3994. |
Theoretical head developed by a centrifugal pump does not depend upon the __________ the impeller. |
| A. | radius of |
| B. | speed of |
| C. | fluid velocity leaving |
| D. | none of these |
| Answer» E. | |
| 3995. |
Velocity distribution for flow between two fixed parallel plates |
| A. | varies parabolically across the section. |
| B. | is constant over the entire cross-section. |
| C. | is zero at the plates and increases linearly to the midplane. |
| D. | none of these. |
| Answer» B. is constant over the entire cross-section. | |
| 3996. |
Priming is needed in a __________ pump. |
| A. | reciprocating |
| B. | gear |
| C. | centrifugal |
| D. | diaphragm |
| Answer» D. diaphragm | |
| 3997. |
An ideal nozzle design aims at |
| A. | minimising wall friction. |
| B. | suppressing boundary layer separation. |
| C. | both (a) & (b). |
| D. | neither (a) nor (b). |
| Answer» D. neither (a) nor (b). | |
| 3998. |
Which of the fluid forces are not considered in the Reynold's equation of flow ? |
| A. | Viscous forces |
| B. | Turbulent forces |
| C. | Pressure forces |
| D. | Compressibility forces |
| Answer» E. | |
| 3999. |
For ideally incompressible fluid, the Mach number will be |
| A. | 1.5 |
| B. | 1 |
| C. | 0 |
| D. | 5 |
| Answer» C. 0 | |
| 4000. |
In an incompressible fluid, the density is |
| A. | greatly affected by moderate changes in pressure. |
| B. | greatly affected only by moderate changes in temperature. |
| C. | not affected with moderate change in temperature & pressure. |
| D. | sensible to changes in both temperature & pressure. |
| Answer» D. sensible to changes in both temperature & pressure. | |