Description : or Indian standard (IS) screens, the mesh number is equal to its aperture size expressed to the nearest deca-micron (0.01 mm). Aperture width of IS screen of mesh number 50 will be approximately __________ microns. (A) 5 (B) 50 (C) 500 (D) 5000
Last Answer : (C) 500
Description : Stress may be expressed in Newtons (A) Per millimetre square (N/mm2 ) (B) Per centimetre square (N/cm2 ) (C) Per metre square (N/m2 ) (D) None of these
Last Answer : (A) Per millimetre square (N/mm2 )
Description : Work index is defined as the (A) Gross energy (kWh/ton of feed) needed to reduce very large feed to such a size that 80% of the product passes through a 100 micron screen (B) Energy needed to crush ... of the product passes a 200 mesh screen (D) Energy needed to crush one ton of feed to 100 microns
Last Answer : (A) Gross energy (kWh/ton of feed) needed to reduce very large feed to such a size that 80% of the product passes through a 100 micron screen
Description : Which of the following is the most significant factor regarding filler in composite for increased strength: A. Particle size 1-3 micron B. Sub micron sized particles C. High concentration of the filler particles
Last Answer : C. High concentration of the filler particles
Description : To get ultrafine particles, the equipment used is a (A) Ball mill (B) Rod mill (C) Hammer crusher (D) Fluid energy mill
Last Answer : (D) Fluid energy mill
Description : For the transportation of ultrafine particles, the equipment used is a __________ conveyor. (A) Belt (B) Pneumatic (C) Screw (D) None of these
Last Answer : (B) Pneumatic
Description : The energy required per unit mass to grind limestone particles of very large size to 100 μm 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 μm is (A) 6.35 kWh/ton (B) 9.0 kWh/ton (C) 18 kWh/ton (D) 25.4 kWh/ton
Last Answer : (C) 18 kWh/ton
Description : The size of a seed rill is expressed by: A. Amount of seed sown per unit time. B. Length x width of the machine. C. Area covered per unit time. D. The number of furrow openers x distance between two furrow
Last Answer : D. The number of furrow openers x distance between two furrow
Description : A 10 C of charge flows through a wire in 5 minutes. The radius of the wire is 1 mm. It contains `5xx10^(22)` electrons per `"centimetre"^(3)`. Calcula
Last Answer : A 10 C of charge flows through a wire in 5 minutes. The radius of the wire is 1 mm. It ... centimetre"^(3)`. Calculate the current and drift velocity.
Description : Pulverised coal passing through 200 mesh screen has a diameter of 0.074 mm (74 micron). The same passing through 50 mesh screen will have a dia of __________ mm. (A) 0.007 (B) 0.30 (C) 50 (D) 0.014
Last Answer : (B) 0.30
Description : The opening of a 200 mesh screen (Taylor series) is (A) 0.0074 cm (B) 0.0074 mm (C) 0.0047 cm (D) 74 milli-micron
Last Answer : (A) 0.0074 cm
Description : The main size reduction operation in ultrafine grinders is (A) Cutting (B) Attrition (C) Compression (D) Impact
Last Answer : (B) Attrition
Description : Which of the following size reduction equipments employs mainly attrition for ultrafine grinding? (A) Jet mills (B) Fluid energy mill (C) Micronizer (D) All (A), (B) and (C)
Last Answer : (D) All (A), (B) and (C)
Description : In a size reduction crushing operation, feed size is 100 to 300 mm. while the product size is 10 to 50 mm. This is a case of the __________ crushing. (A) Primary (B) Secondary (C) Fine (D) Ultrafine
Last Answer : (B) Secondary
Description : In a size reduction crushing operation, feed size is 300 to 1500 mm while the product size is 100 to 300 mm. This is a case of the __________ crushing. (A) Secondary (B) Fine (C) Primary (D) Ultrafine
Last Answer : (C) Primary
Description : Screen capacity is expressed in terms of (A) tons/hr (B) tons/ft 2 (C) Both (A) & (B) (D) tons/hr-ft
Last Answer : (D) tons/hr-ft
Description : Which mass measurement is expressed in exactly four significant figures 0.001 g 0.095 g 1005 g 1000 g?
Last Answer : 1005 g
Description : Roughness index of roads, is expressed as (A) Size of the stone on the pavement (B) Number of patches on the pavement (C) Cumulative deformation of surface per horizontal distance (D) Type of the road surface
Last Answer : Answer: Option C
Description : The size of an atom is of the order of one (A) °Angstrom (B) Fermi (C) Micron (D) mm
Last Answer : (A) °Angstrom
Description : The drag co-efficient for a bacterium moving in water at 1 mm/s, will be of the following order of magnitude (assume size of the bacterium to be 1 micron and kinematic viscosity of water to be 10 -6m2 /s). (A) 24000 (B) 24 (C) 0.24(D) 0.44
Last Answer : (D) 0.44
Description : The presence of pollutants in the environment is usually expressed in ppm, where ppm stands for: (1) particles per mole (2) purity per microgram (3) pollutant prevent measures (4) parts per million
Last Answer : (4) parts per million Explanation: PPM is an abbreviation of Parts Per Million. It is commonly used as a measure of small levels of pollutants in air, water, body fluids, etc. Parts per million is the mass ratio between the pollutant component and the solution.
Last Answer : parts per million
Description : Reciprocal of sphericity is termed as the (A) Specific surface ratio (B) Shape factor (C) Sauter diameter (D) Surface area per unit mass
Last Answer : (B) Shape factor
Description : Solid angle subtended by the finite surface at the radiating element is (A) Called the view factor (B) Called the angle of vision (C) Proportional to the square of the distance between surfaces (D) Expressed in terms of radians
Last Answer : (B) Called the angle of vision
Description : Crude oils containing more than __________ kg of total salts (expressed in terms of NaCl) per thousand barrel is called a 'salty crude'. (A) 1 (B) 5 (C) 15 (D) 25
Last Answer : (B) 5
Description : The heights of 50 students, measured to the nearest centimetre, -Maths 9th
Last Answer : Frequency distribution of above data in tabular form is given as: (ii) One conclusion we can draw from the above table is that more than 50% of students are shorter than 165 cm.
Description : Electric current is the flow of electrons through a conductor. The rate of this flow is measured as ___________. A. volts/watt B. amperes/centimetre C. coulombs/second D. ohms/volt
Last Answer : Answer: C
Description : The skin depth is measured in a) Meter b) Millimetre c) Centimetre d) Micrometer
Last Answer : d) Micrometer
Description : The most suitable unit for expressing nuclear radius is - (1) nanometre (2) fermi (3) angstrom (4) micron
Last Answer : (2) fermi Explanation: The atomic radius is a measure of the size of an atom. It is defined as one half the distance between the nuclei of two identical atoms that are bonded together. Angstrom is the most common unit used for measuring atomic radius.
Description : Which of the following is not the unit of distance? (A) Angstrom (B) Light year (C) Micron (D) Milestone
Last Answer : (D) Milestone
Description : The most suitable unit for expressing nuclear radius is : (1) nanometre (2) fermi (3) angstrom (4) micron
Last Answer : angstrom
Description : Pick out the wrong statement. (A) Cumulative analysis for determining surface area is preferred over differential analysis, because of the assumption that "all particles in a simple fraction equal in size" is ... throwing of the balls through the air to the toe of the heap is called 'cataracting'
Last Answer : (C) Capacity of crusher in choke feeding is increased
Description : The smallest size of a cell that can be seen with naked eye is: (1) 1 micron (2) 10 micron (3) 100 micron (4) 1000 micron
Last Answer : (3) 100 micron Explanation: The smallest objects that can be seen with unaided eye are about 0.1 mm long, which is equal to 100 micrometres. Micron (u) is an alternate name of micrometre.
Description : Drift susceptible size of droplets in micron diameter is a). 150-200 b). 200-250 c). 250
Last Answer : c).
Last Answer : 100 micron
Description : Colloidal mills are used for __________ grinding. (A) Coarse (B) Intermediate (C) Fine (D) Ultrafine
Last Answer : (D) Ultrafine
Description : Which of the following is not an ultrafine grinder (colloid mill)? (A) Micronizers (B) Agitated mills and fluid energy mills (C) Toothed roll crusher (D) Hammer mills with internal classification
Last Answer : (C) Toothed roll crusher
Description : Ultrafine grinders operate principally by (A) Slow compression (B) Impact (C) Attrition (D) Cutting action
Last Answer : (C) Attrition
Description : Temperature of the product during ultrafine grinding (A) Increases (B) Decreases (C) Remain constant (D) May increase or decrease; depends on the material being ground
Last Answer : (A) Increases
Description : Use of 'grinding aids' is done in __________ grinding. (A) Dry (B) Wet (C) Ultrafine (D) Intermediate
Last Answer : (A) Dry
Description : Fluid energy mill comes in the category of (A) Grinder (B) Crusher (C) Cutter (D) Ultrafine grinder
Last Answer : (D) Ultrafine grinder
Description : Gravity stamp mill is meant for the __________ crushing. (A) Primary (B) Intermediate (C) Fine (D) Ultrafine
Last Answer : (C) Fine
Description : An elastic behaviour of materials is expressed in terms of (A) Hysteresis loop area (B) Stress-strain curve (C) Relaxation time
Last Answer : (C) Relaxation time
Description : Masses of stars and galaxies are usually expressed in terms of which mass?
Last Answer : Solar mass
Description : Work index is the gross energy (kWh/tonne of feed) necessary to reduce a very large feed to such a size that 80% of product particles will pass through a 0.1 mm screen. The value of work index determined for wet grinding should ... to get the same for dry grinding. (A) 1.0 (B) 0.5 (C) 1.34 (D) 4.34
Last Answer : (C) 1.34
Description : Which of the following is not a characteristic of a marketing objective? A)Consistent with both business -unit and corporate strategy B)Expressed in clear, simple terms C)Written ... accurately D)Specifies a time frame for its accomplishment E)Detailed enough for marketing strategy implementation
Last Answer : E)Detailed enough for marketing strategy implementation
Description : In common size Balance Sheet analysis we evaluate– (A) Increase or decrease over two years is analysed (B) Only increase over two years is analysed (C) Only decrease over two years is analysed (D) All assets and liabilities are expressed in terms of percentage of total
Last Answer : Answer: All assets and liabilities are expressed in terms of percentage of total
Description : Poverty line is expressed in terms of an overall _______ A. Per capita Income B. Per Capita consumption expenditure C. Per Capita entertainment expenditure D. Per Capita development expenditure E. Per Capita GDP
Last Answer : B. Per Capita consumption expenditure Explanation: In India consumption-expenditure has been made the basis for the measurement of the minimum standard. The usual method is to fix a poverty level. This level is expressed in terms of an overall per capita consumption-expenditure.
Description : Cable attenuation is usually expressed in terms of a. Loss per foot b. dB/km c. intensity per mile d. voltage drop per inch
Last Answer : b. dB/km
Description : The capacity of a battery is expressed in terms of A ampere per hour B current C volt D ampere
Last Answer : A ampere per hour