MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 2253 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 2051. |
The usual energy consumption in electric arc furnace steel making is __________ KWh/ton of steel. |
| A. | 60 - 100 |
| B. | 400 - 700 |
| C. | 1200 -1500 |
| D. | 2000 - 2300 |
| Answer» C. 1200 -1500 | |
| 2052. |
Coke is added in the blast furnace to |
| A. | reduce & melt the iron ore. |
| B. | increase the fluidity of slag. |
| C. | remove sulphur & phosphorus from molten metal. |
| D. | none of these. |
| Answer» B. increase the fluidity of slag. | |
| 2053. |
Filler metal is used in __________ welding. |
| A. | braze |
| B. | electric spot |
| C. | projection |
| D. | seam |
| Answer» B. electric spot | |
| 2054. |
Silicon crystal can be converted to p-type semi-conductor by doping with |
| A. | phosphorous |
| B. | nitrogen |
| C. | carbon |
| D. | boron |
| Answer» E. | |
| 2055. |
Electrical conductivities of semi-conductors are of the order of __________ ohm/cm. |
| A. | 43534 |
| B. | 103 |
| C. | 42278 |
| D. | l015 |
| Answer» B. 103 | |
| 2056. |
The units of the rate constant for a second order reaction are |
| A. | sec-1. mole°. |
| B. | moles1. sec-1. |
| C. | moles-1. sec1. |
| D. | moles1. sec1. |
| Answer» D. moles1. sec1. | |
| 2057. |
The phenomenon of strain-ageing is generally experienced with |
| A. | cast iron. |
| B. | low carbon steel. |
| C. | high manganese steel. |
| D. | high carbon steel. |
| Answer» C. high manganese steel. | |
| 2058. |
Pick out the wrong statement about the machinability of metals. Machinability of a metal |
| A. | decreases with increase in strain hardening tendencies. |
| B. | decreases with increase in hardness, in general. |
| C. | depends on the composition, microstructure and physical & mechanical properties. |
| D. | decreases with increases in tensile strength & decrease in grain size. |
| Answer» E. | |
| 2059. |
If a nuclear reactor produces more fissile nuclear fuel than it consumes, then it is called a __________ reactor. |
| A. | critical |
| B. | breeder |
| C. | fertile |
| D. | heterogenous |
| Answer» C. fertile | |
| 2060. |
The predominant mode of heat transfer which takes place from boiler furnace to water walls of a boiler is |
| A. | conduction |
| B. | convection |
| C. | both'a' & 'b' |
| D. | radiation |
| Answer» E. | |
| 2061. |
Gantt charts are used for streamlining the |
| A. | inventory control |
| B. | production schedule |
| C. | sales forecasting |
| D. | quality control |
| Answer» C. sales forecasting | |
| 2062. |
In fluid flow, and heat and mass transfer, one encounters (i) kinematic velocity (μ), (ii) molecular diffusivity (θ) and thermal diffusivity (α). The units of these quantities are. |
| A. | μ , α and θ all have units of m/s. |
| B. | μ , α and θ all have units of m2/s. |
| C. | α and θ have units of m2/s, while μ has unit of m/s. |
| D. | α and θ have units of m/s, while μ has unit of m2/s. |
| Answer» D. Œ± and Œ∏ have units of m/s, while Œº has unit of m2/s. | |
| 2063. |
The 'laughing gas' is |
| A. | nitrous oxide |
| B. | nitric oxide |
| C. | nitrogen trioxide |
| D. | nitrogen pentoxide |
| Answer» B. nitric oxide | |
| 2064. |
The product out from a cupola is called |
| A. | wrought iron |
| B. | pig iron |
| C. | cast iron |
| D. | none of these |
| Answer» D. none of these | |
| 2065. |
Midrex process of sponge iron production uses reformed natural gas as the reducing agent, which uses iron ore in the form of |
| A. | lumps |
| B. | pellets |
| C. | briquettes |
| D. | sinter |
| Answer» C. briquettes | |
| 2066. |
Which of the following is not an ore of zinc? |
| A. | Cerrusite |
| B. | Franklinite |
| C. | Calamine |
| D. | Troosite |
| Answer» B. Franklinite | |
| 2067. |
The transition temperature at which all the ferromagnetic materials become paramagnetic materials is termed as the 'Curie temperature'. Its value for cobalt is __________ °C. |
| A. | 768 |
| B. | 1127 |
| C. | 1359 |
| D. | 1480 |
| Answer» C. 1359 | |
| 2068. |
In TIG welding, thoriated tungsten electrodes are used, because it |
| A. | has higher current carraying capacity. |
| B. | has better electron emissivity. |
| C. | is stronger than ordinary tungsten. |
| D. | is easy to prepare. |
| Answer» C. is stronger than ordinary tungsten. | |
| 2069. |
The normal stress is the same in all directions at a point in a fluid, only when the fluid |
| A. | is at rest & has zero viscosity. |
| B. | is frictionless. |
| C. | fluid layer has no motion relative to an adjacent layer of fluid. |
| D. | is incompressible & frictionless. |
| Answer» E. | |
| 2070. |
Case hardening is not done by |
| A. | nitriding |
| B. | hot dipping |
| C. | electroplating |
| D. | both b & c |
| Answer» E. | |
| 2071. |
Which of the following pairs is not correctly matched ? |
| A. | Uranium - 233 : Fertile material. |
| B. | Bindingenergy : Mass defect. |
| C. | Scattering: Absorption cross-section. |
| D. | Number of nucleons : Mass number. |
| Answer» B. Bindingenergy : Mass defect. | |
| 2072. |
Wavelength of radiation emitted by a body depends on the __________ of its surface. |
| A. | temperature |
| B. | area |
| C. | nature |
| D. | all 'a', 'b' & 'c' |
| Answer» B. area | |
| 2073. |
Internal energy of a gas obeying Vanderwall's equation of state, , depends upon its |
| A. | pressure & temperature. |
| B. | pressure & specific volume. |
| C. | temperature & specific volume. |
| D. | temperature only. |
| Answer» B. pressure & specific volume. | |
| 2074. |
The delivery pressure of boiler feed water pump compared to the boiler steam pressure is |
| A. | same |
| B. | slightly less |
| C. | slightly more |
| D. | much more |
| Answer» D. much more | |
| 2075. |
Out of the following, the most melleable material is |
| A. | copper |
| B. | aluminium |
| C. | wrought iron |
| D. | lead |
| Answer» E. | |
| 2076. |
The emf of a Deniell cell can be increased by |
| A. | decreasing the surface area of the electrodes. |
| B. | increasing the concentration of zinc sulphate solution. |
| C. | increasing the surface area of the electrodes. |
| D. | increasing the concentration of copper sulphate solution. |
| Answer» E. | |
| 2077. |
Hardness & tensile strength of austenitic stainless steel can be increased by |
| A. | martempering |
| B. | cold working |
| C. | normalising |
| D. | hardening |
| Answer» C. normalising | |
| 2078. |
The term 'Value' in value engineering technique refers to the __________ cost of the product. |
| A. | function (utility) |
| B. | selling |
| C. | production |
| D. | total |
| Answer» B. selling | |
| 2079. |
Which of the following test is used for distinguishing among dry oils, semi-drying oils and non drying oils ? |
| A. | Elaiden test |
| B. | Reichart-Meissl value test |
| C. | Henter value test |
| D. | Iodine value test |
| Answer» B. Reichart-Meissl value test | |
| 2080. |
A high pressure boiler generates steam at a pressure greater than __________ kg/cm2 . |
| A. | 10 |
| B. | 30 |
| C. | 50 |
| D. | 80 |
| Answer» E. | |
| 2081. |
Which of the following is not an explosive ? |
| A. | TNT |
| B. | CMC |
| C. | RDX |
| D. | Lead azide |
| Answer» C. RDX | |
| 2082. |
Which of the following pair is correctly matched? |
| A. | Heat transfer: Thermal diffusivity. |
| B. | Mass transfer: Diffusion co-efficient. |
| C. | Momentum transfer: Kinematic viscosity. |
| D. | all 'a', 'b' & 'c' are correctly matched. |
| Answer» E. | |
| 2083. |
Chromium molybdenum steel can not be welded using __________ welding. |
| A. | thermit |
| B. | electrical resistance |
| C. | oxy-acetylene |
| D. | any of these |
| Answer» C. oxy-acetylene | |
| 2084. |
For separating small pieces of metal from engine oil of a car, the best separating technique is the |
| A. | chromatography |
| B. | evaporation |
| C. | filtration |
| D. | fractional distillation |
| Answer» D. fractional distillation | |
| 2085. |
Auto collimator is used to check |
| A. | flatness |
| B. | angle |
| C. | rotor balancing |
| D. | roughness |
| Answer» C. rotor balancing | |
| 2086. |
__________ number determines whether the fluid flow in an open channel is supercritical, critical or sub-critical. |
| A. | Mach |
| B. | Reynolds |
| C. | Froude |
| D. | Weber |
| Answer» D. Weber | |
| 2087. |
Energy to be supplied to the radioactive nucleus for the emission of a neutron is __________ MeV. |
| A. | 0.8 |
| B. | 7.8 |
| C. | 200 |
| D. | 10000 |
| Answer» B. 7.8 | |
| 2088. |
The best criterion for analysing an economic investment is the |
| A. | rate of return criterion. |
| B. | present value method. |
| C. | salvage value. |
| D. | future value method. |
| Answer» B. present value method. | |
| 2089. |
A fluid is termed as the Newtonion fluid, when the shear stress is __________ the velocity gradient. |
| A. | independent of |
| B. | inversely proportional to |
| C. | directly proportional to |
| D. | none of these |
| Answer» D. none of these | |
| 2090. |
A pipeline buried in soil is commonly protected from corrosion by |
| A. | anodic protection. |
| B. | cathodic protection. |
| C. | using inhibitors. |
| D. | using a special alloy resistant to corrosion. |
| Answer» C. using inhibitors. | |
| 2091. |
The difference between gross & net calorific values of fuel is due to the |
| A. | sensible heat carried away by the flue gases. |
| B. | heat carried away by the steam from the moisture content of the fuel. |
| C. | heat lost by radiation. |
| D. | heat carried away by steam from the combustion of hydrogen in the fuel. |
| Answer» E. | |
| 2092. |
Baffles provided on the shell side of a shell and tube heat exchanger are meant for |
| A. | providing support for the tubes. |
| B. | improving heat transfer. |
| C. | both 'a' & 'b'. |
| D. | preventing the fouling of tubes & stagnation of shell side fluid. |
| Answer» D. preventing the fouling of tubes & stagnation of shell side fluid. | |
| 2093. |
Device used as a standard for the calibration of pressure gauges is a |
| A. | bellow |
| B. | diaphragm |
| C. | dead weight pressure tester |
| D. | mercury manometer |
| Answer» D. mercury manometer | |
| 2094. |
Which of the following is not categorised as the ore agglomeration process ? |
| A. | Nodulising |
| B. | Pelletising |
| C. | Balling |
| D. | Briquetting |
| Answer» D. Briquetting | |
| 2095. |
With increase in annealing temperature, the following defect density decreases. |
| A. | Vacancy |
| B. | Dislocation |
| C. | Grain boundary |
| D. | All of them |
| Answer» E. | |
| 2096. |
Copper deposits are found in India at the following location: |
| A. | Kudremukh |
| B. | Kolar |
| C. | Khetri |
| D. | Ramagundam |
| Answer» D. Ramagundam | |
| 2097. |
Heating the hypoeutectoid steels to 30°C above the upper critical temperature line, soaking at that temperature and then cooling slowly to the room temperature to form a pearlite & ferrite structure is called |
| A. | tempering |
| B. | hardening |
| C. | annealing |
| D. | normalising |
| Answer» D. normalising | |
| 2098. |
Secondary hardening in steels arises out of the |
| A. | precipitation of fine alloy carbides at high temperatures. |
| B. | refinement of ferrite grain size by working. |
| C. | decomposition of retained austenite upon heat treatment. |
| D. | precipitation of complex inter-metal-lics upon heat treatment. |
| Answer» D. precipitation of complex inter-metal-lics upon heat treatment. | |
| 2099. |
When a tuning fork vibrates, the waves produced in the fork are |
| A. | stationary |
| B. | longitudinal |
| C. | progressive |
| D. | transverse |
| Answer» C. progressive | |
| 2100. |
The underground well of a biogas plant is called the |
| A. | septic tank |
| B. | oxidation well |
| C. | digestor |
| D. | lagoon |
| Answer» D. lagoon | |