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.
| 951. |
For a typical project, the cumulative cash flow is zero at the |
| A. | end of the project life. |
| B. | break even point. |
| C. | start up. |
| D. | end of the design stage. |
| Answer» C. start up. | |
| 952. |
Which of the following is the costliest source of getting hydrogen on commercial scale for the manufacture of nitrogeneous fertiliser ? |
| A. | Coal gasification |
| B. | Steam reforming of naphtha |
| C. | Alectrolysis of water |
| D. | Coke oven gas |
| Answer» D. Coke oven gas | |
| 953. |
Heat transfer rate to the stock/charge in the furnace does not depend upon the |
| A. | emissivity of the refactory walls. |
| B. | size of the furance. |
| C. | use of waste heat recovery equipments. |
| D. | thickness of the stock. |
| Answer» D. thickness of the stock. | |
| 954. |
Power required in case of forced draught as compared to induced draught (for the same draught produced) is |
| A. | same |
| B. | less |
| C. | more |
| D. | either more or less; depends on the flue gas density |
| Answer» C. more | |
| 955. |
Means for giving direction to the circulation of gases in furnaces are |
| A. | fans. |
| B. | arrangement of heating stock in the furnaces. |
| C. | location of outlet ports and heating & combustion devices. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 956. |
Turndown ratio of a burner gives an idea of the __________ in the furnace. |
| A. | range of fuel firing rates |
| B. | volume of the combustion chamber |
| C. | maximum heat input rate only |
| D. | minimum heat input rate only |
| Answer» B. volume of the combustion chamber | |
| 957. |
Reverberatory furnace is used for |
| A. | roasting/reduction of ores |
| B. | annealing steel coil |
| C. | heating air |
| D. | steel melting |
| Answer» B. annealing steel coil | |
| 958. |
Overall thermal efficiency of a lumpy coal fired suitably designed heating furnace, if operated & maintained properly may be about __________ percent. |
| A. | 10-15 |
| B. | 25-30 |
| C. | 45-50 |
| D. | 65-70 |
| Answer» C. 45-50 | |
| 959. |
__________ furnace is not an electric furnace. |
| A. | Arc |
| B. | Induction |
| C. | Pot |
| D. | Resistance. |
| Answer» D. Resistance. | |
| 960. |
Forced recirculation of furnace gases is practised |
| A. | to increase heat transfer by convection. |
| B. | to ensure uniform temperature. |
| C. | in furnaces, operating below 750 C. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 961. |
Flue gas outlet temperature from the chimney of any furnace should be ideally about __________ C. |
| A. | 50 |
| B. | 100 |
| C. | 150 |
| D. | 250 |
| Answer» D. 250 | |
| 962. |
Very high pressure boilers are usually __________ boilers. |
| A. | fire tube |
| B. | water tube |
| C. | waste heat |
| D. | natural circulation |
| Answer» E. | |
| 963. |
Artificial draught produced by a fan in the furnace can be controlled by the |
| A. | speed of the fan. |
| B. | damper. |
| C. | variation in the pitch of fan blades. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 964. |
Regenerators as compared to recuperators for the same duty |
| A. | store smaller quantity of waste heat |
| B. | are lighter & compact |
| C. | involve higher initial cost |
| D. | all (a), (b) & (c) |
| Answer» D. all (a), (b) & (c) | |
| 965. |
Main gas valve in a gaseous fuel burner is a __________ valve. |
| A. | gate |
| B. | butterfly |
| C. | globe |
| D. | none of these |
| Answer» B. butterfly | |
| 966. |
Which of the following is a rotary furnace? |
| A. | Lime kiln |
| B. | Soaking pit |
| C. | Stoves |
| D. | Annealing furnace. |
| Answer» B. Soaking pit | |
| 967. |
Recuperator is |
| A. | not used for fuel gas preheating. |
| B. | an intermittant waste heat recovery equipment. |
| C. | a continuous waste heat recovery equipment. |
| D. | heavier than regenerator meant for the same duty. |
| Answer» D. heavier than regenerator meant for the same duty. | |
| 968. |
Which of the following is stretched into fibres ? |
| A. | Saturated polyester |
| B. | Unsaturated polyester |
| C. | Isoprene |
| D. | Bakelite |
| Answer» B. Unsaturated polyester | |
| 969. |
Antioxidants are added to rubber to protect it from the attack of light, heat & atmospheric ozone. Which of the following is an antioxident used in rubber ? |
| A. | Carbon |
| B. | Alkylated diphenyl amine |
| C. | Thiokol |
| D. | Magnesium |
| Answer» C. Thiokol | |
| 970. |
Alkyd resin is a/an |
| A. | polyamide |
| B. | polyester |
| C. | polyolefin |
| D. | addition polymer |
| Answer» C. polyolefin | |
| 971. |
Gutta parcha rubber is |
| A. | soft & tacky at room temperature. |
| B. | an isomer of natural rubber. |
| C. | a thermosetting resin. |
| D. | recovered by coagulation of rubber latex. |
| Answer» C. a thermosetting resin. | |
| 972. |
Polyhexamethylene adipimide is also known as |
| A. | bakelite |
| B. | nylon-66 |
| C. | epoxy resin |
| D. | silicone rubber |
| Answer» C. epoxy resin | |
| 973. |
Which of the following rubbers has the widest service temperature range (-75 to 275 C) ? |
| A. | Butyl rubber |
| B. | Silicon rubber |
| C. | Nitrile rubber |
| D. | Silicone rubber |
| Answer» E. | |
| 974. |
__________ polymer is used for making unbreakable crockery. |
| A. | Thermoplastic |
| B. | Melamine |
| C. | Addition |
| D. | none of these |
| Answer» C. Addition | |
| 975. |
Elastomers are |
| A. | thermosetting material. |
| B. | exemplified by protein derivatives. |
| C. | having high flexural strength. |
| D. | having very high tensile strength and heat resistance. |
| Answer» D. having very high tensile strength and heat resistance. | |
| 976. |
Polyvinyl alcohol is used as a |
| A. | cation/anion exchanger. |
| B. | water soluble adhesive. |
| C. | textile fibre. |
| D. | non-sticky coating on frying pans. |
| Answer» C. textile fibre. | |
| 977. |
Which of the following is the lowest cost plastic commercially available ? |
| A. | Polythene |
| B. | Teflon |
| C. | Bakelite |
| D. | PVC |
| Answer» B. Teflon | |
| 978. |
Polymers are |
| A. | micromolecules |
| B. | macromolecules |
| C. | sub-micromolecules |
| D. | none of these |
| Answer» C. sub-micromolecules | |
| 979. |
A chain growth polymerisation reaction consists of three different types of reaction namely initiation reaction, propagation reaction & termination reaction. Chain growth polymerisation reaction is not involved in the manufacture of |
| A. | siloxane elastomers. |
| B. | polyamides. |
| C. | vinyl polymers. |
| D. | urea-formaldehyde resins. |
| Answer» E. | |
| 980. |
Hot drink (e.g, tea) cups are usually made of |
| A. | polystyrene |
| B. | polythene |
| C. | polypropylene |
| D. | PVC |
| Answer» B. polythene | |
| 981. |
Poly Vinyl chloride (PVC) is a __________ material. |
| A. | thermoplastic |
| B. | thermosetting |
| C. | fibrous |
| D. | chemically active |
| Answer» B. thermosetting | |
| 982. |
A fertiliser contains 82% N2. It could be |
| A. | urea |
| B. | liquid NH |
| C. | <sub>3</sub> |
| D. | ammonium nitrate |
| E. | none of these |
| Answer» C. <sub>3</sub> | |
| 983. |
Nitrogen content of calcium ammonium nitrate (CAN) is __________ percent. |
| A. | 10 |
| B. | 25 |
| C. | 50 |
| D. | 80 |
| Answer» C. 50 | |
| 984. |
Which of the following gasifiers can be attached to coal based fertiliser plants ? |
| A. | Lurgi (high pressure) gasifier. |
| B. | Kopper-Totzek gasifier. |
| C. | Gasifier working at 20 atm. |
| D. | Gasifier working at 40 atm. |
| Answer» C. Gasifier working at 20 atm. | |
| 985. |
Main constituent of phosphate rock is |
| A. | ammonium phosphate |
| B. | flour apatite |
| C. | calcium fluoride |
| D. | calcium phosphate |
| Answer» C. calcium fluoride | |
| 986. |
Heating a mixture of phosphate rock, coke and sand in an electric furnace produces |
| A. | phosphoric acid |
| B. | ammonium phosphate |
| C. | phosphorous |
| D. | superphosphate |
| Answer» D. superphosphate | |
| 987. |
Shell side pressure drop in a shell and tube heat exchanger does not depend upon the |
| A. | baffle spacing & shell diameter. |
| B. | tube diameter & pitch. |
| C. | viscosity, density & mass velocity of shell side fluid. |
| D. | none of these. |
| Answer» E. | |
| 988. |
In the equation Q = UA t; t is |
| A. | geometric mean temperature difference. |
| B. | arithmetic mean temperature difference. |
| C. | logarithmic mean temperature difference. |
| D. | the difference of average bulk temperatures of hot and cold fluids. |
| Answer» D. the difference of average bulk temperatures of hot and cold fluids. | |
| 989. |
With increase in porosity, the thermal conductivity of a solid substance |
| A. | increases |
| B. | decreases |
| C. | remains unchanged |
| D. | may increase or decrease; depends on the solid |
| Answer» C. remains unchanged | |
| 990. |
For an ideal black body |
| A. | absorptivity = 1 |
| B. | reflectivity = 1 |
| C. | emissivity = 0 |
| D. | transmissivity = 1 |
| Answer» B. reflectivity = 1 | |
| 991. |
In Joule's experiment, an insulated container contains 20 kg of water initially at 25 C. It is stirred by an agitator, which is made to turn by a slowly falling body weighing 40 kg through a height of 4 m. The process is repeated 500 times. The acceleration due to gravity is 9.8 ms-2. Neglecting the heat capacity of agitator, the temperature of water (in C) is |
| A. | 40.5 |
| B. | 34.4 |
| C. | 26.8 |
| D. | 25 |
| Answer» C. 26.8 | |
| 992. |
Fouling factor |
| A. | is a dimensionless quantity. |
| B. | does not provide a safety factor for design. |
| C. | accounts for additional resistances to heat flow. |
| D. | none of these. |
| Answer» D. none of these. | |
| 993. |
In case of vertical tube evaporator, with increase in liquor level, the overall heat transfer co-efficient |
| A. | increases |
| B. | decreases |
| C. | is not affected |
| D. | may increase or decrease; depends on the feed |
| Answer» C. is not affected | |
| 994. |
The value of 'angle of nip' is generally about |
| A. | 16 |
| B. | 32 |
| C. | 52 |
| D. | 64 |
| Answer» C. 52 | |
| 995. |
Size reduction of the __________ can be suitably done by ball mills, crushing rolls and rod mills. |
| A. | metalliferrous ores |
| B. | non-metallic ores |
| C. | basic slags |
| D. | asbestos & mica |
| Answer» B. non-metallic ores | |
| 996. |
Sulphuric acid mist is arrested by using a __________ scrubber. |
| A. | packed wet |
| B. | hollow wet |
| C. | venturi |
| D. | co-current |
| Answer» D. co-current | |
| 997. |
The main size reduction operation in ultrafine grinders is |
| A. | cutting |
| B. | attrition |
| C. | compression |
| D. | impact |
| Answer» C. compression | |
| 998. |
In case of a hammer crusher, |
| A. | crushing takes place by impact breaking. |
| B. | maximum acceptable feed size is 30 cms. |
| C. | reduction ratio can be varied by adjusting the distance from cage to hammers. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 999. |
The energy required per unit mass to grind limestone particles of very large size to 100 m is 12.7 kWh/ton. An estimate (using Bond's law) of the energy to grind the particles from a very large size to 50 rn is |
| A. | 6.35 kWh/ton |
| B. | 9.0 kWh/ton |
| C. | 18 kWh/ton |
| D. | 25.4 kWh/ton |
| Answer» D. 25.4 kWh/ton | |
| 1000. |
Which of the following is the most suitable for cleaning of fine coal dust (<0.5 mm) ? |
| A. | Trough washer |
| B. | Baum jig washer |
| C. | Spiral separator |
| D. | Froth floatation |
| Answer» E. | |