Description : . One stoke (unit of kinematic viscosity) is equivalent to (A) 1 cm2 /second (B) 1 m2 /second (C) 1 gm/cm. second (D) 1 kg. m/second
Last Answer : (A) 1 cm2 /second
Description : N. second/m2 is (A) The S.I. unit of dynamic viscosity (B) The S.I. unit of kinematic viscosity (C) Equivalent to one poise (D) Equivalent to one stoke
Last Answer : (A) The S.I. unit of dynamic viscosity
Description : The kinematic viscosity of an oil (in stokes) whose specific gravity is 0.95 and viscosity 0.011 poise, is (A) 0.0116 stoke (B) 0.116 stoke (C) 0.0611 stoke (D) 0.611 stoke
Last Answer : Answer: Option A
Description : The kinematic viscosity (in stoke) and the absolute/dynamic viscosity (in poise) are the same for __________ at room temperature. (A) Air (B) Water (C) Mercury (D) Alcohol
Last Answer : (B) Water
Description : One poise (unit of absolute/dynamic viscosity) is equivalent to one (A) gm/cm2 . sec (B) gm/cm. sec (C) cm2 /sec (D) m2 /sec
Last Answer : (B) gm/cm. sec
Description : Pick out the wrong statement. (A) The binary diffusivity in liquids is of the order of 10 -5 cm2 /sec (B) Molecular diffusion in solid is much faster than that in liquids ( ... Poiseuille's law, the permeability decreases with increase in temperature for flow of a gas through a given capillary
Last Answer : (B) Molecular diffusion in solid is much faster than that in liquids
Description : The unit of dynamic viscosity in S.I. units is (A) N-m/s2 (B) N-s/m2 (C) Poise (D) Stoke
Last Answer : Answer: Option B
Description : Which of the following is the unit of kinematic viscosity? (A) Pascal (B) Poise (C) Stoke (D) Faraday
Last Answer : Answer: Option C
Description : Stoke is the unit of (A) Kinematic viscosity in C. G. S. units (B) Kinematic viscosity in M. K. S. units (C) Dynamic viscosity in M. K. S. units (D) Dynamic viscosity in S. I. units
Description : One stoke is equal to (A) 10-2 m2 /s (B) 10-3 m2 /s (C) 10-4 m2 /s (D) 10-6 m2 /s
Description : The unit of kinematic viscosity in S. I. units is (A) N-m/s (B) N-s/m2 (C) m 2 /s (D) N-m
Description : Pick out the wrong statement: (A) Greater is the kinematic viscosity of the liquid, greater is the thickness of the boundary layer (B) Blowers develop a maximum pressure of 2 atmospheres ( ... factor in case of turbulent flow of liquids in pipe depends upon relative roughness & Reynolds number
Last Answer : (C) Friction losses in pipe fittings are generally expressed in terms of velocity heads
Description : 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/ ... μ has unit of m/s (D) α and θ have units of m/s, while μ has unit of m2/s
Last Answer : Option C
Description : Pick out the wrong statement pertaining to fluid flow. (A) The ratio of average velocity to the maximum velocity for turbulent flow of Newtonian fluid in circular pipes is 0.5 (B) The Newtonian ... at the centre of the pipe (C) Navier-Stokes equation is applicable to the analysis of viscous flows
Last Answer : (A) The ratio of average velocity to the maximum velocity for turbulent flow of Newtonian fluid in circular pipes is 0.5
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 : The unit of dynamic viscosity in SI unit is (A) kg/m. sec (B) N/m2 (C) m2 /sec (D) m/N. sec
Last Answer : (A) kg/m. sec
Description : The effect of solid boundary on the fluid flow is confined to the boundary layer, except for fluids (A) Having high viscosities (B) Moving at low velocities (C) Both (A) & (B) (D) Neither (A) nor (B)
Last Answer : (C) Both (A) & (B)
Description : Increase in temperature, in general results in the (A) Decrease in the viscosities of both liquids & gases (B) Increase in the viscosities of both liquids & gases (C) Increase in the viscosity of ... decrease in that of gases (D) Decrease in the viscosity of liquids and increase in that of gases
Last Answer : (D) Decrease in the viscosity of liquids and increase in that of gases
Description : Pick out the wrong statement: (A) With change in temperature, the radiant energy emitted by a black body remains unchanged (B) Absorptivity of a body approaches unity in case of diffuse reflection (C) Absorptivity of ... unity (D) Value of Stefan-Boltzmann constant is 4.876 10 -8 KCal/m2 .hr.°K4
Last Answer : (A) With change in temperature, the radiant energy emitted by a black body remains unchanged
Description : What is considered the threshold of audibility at 3000 Hz? A. 10-12 W/m2 B. 10-16 W/m2 C. 10-12 W/cm2 D. 10-15 W/cm2
Last Answer : A. 10-12 W/m2
Description : The units of kinematic viscosity are (A) Metres² per sec (B) kg sec/metre (C) Newton-sec per metre (D) Newton-sec per metre
Description : Research reactors are normally meant for (A) Producing high neutron flux 10 12 -10 13 neutrons/cm2 , sec and studying the effect of neutron bombardment on different materials (B) Accelerating the neutrons (C) Power generation (D) None of these
Last Answer : (A) Producing high neutron flux 10 12 -10 13 neutrons/cm2 , sec and studying the effect of neutron bombardment on different materials
Description : The binary diffusivity in gases at atmospheric conditions is about (A) 10 -9 cm/sec (B) 10 -1 cm2 /sec (C) 10 -3 sec/cm (D) 10 -4 cm2 /sec
Last Answer : (B) 10 -1 cm2 /sec
Description : The kinematic viscosity is the (A) Ratio of absolute viscosity to the density of the liquid (B) Ratio of density of the liquid to the absolute viscosity (C) Product of absolute viscosity and density of the liquid (D) Product of absolute viscosity and mass of the liquid
Description : The ratio of absolute viscosity to mass density is known as (A) Specific viscosity (B) Viscosity index (C) Kinematic viscosity (D) Coefficient of viscosity
Description : Pick out the wrong statement. (A) Superheated steam is preferably not used for process heating because of its low heat transfer film co-efficient (B) In a shell and tube heat exchanger ... surface heat exchangers, when the direction of fluid flow is parallel to the axis of the tube
Last Answer : (C) S.I. unit of fouling factor is Watt/m2 .°K
Description : In the conversion of line integral of H into surface integral, which theorem is used? a) Green theorem b) Gauss theorem c) Stokes theore d) It cannot be converted
Last Answer : c) Stokes theorem
Description : Turbine impeller (A) Produces only radial current (B) Produces only tangential current (C) Is effective over wide range of viscosities (D) Does not produce tangential current
Last Answer : (C) Is effective over wide range of viscosities
Description : X and y are two trains of length 500m and 400m run on parallel lines. When they run in the same direction it will take 60 sec to cross each other. When they run in opposite direction, it will take 20 sec to cross each ... ) A) 116 and 42 km/hr B) 54 and 78km/hr C) 104 and 60km/hr D) 108 and 54km/hr
Last Answer : ANSWER : D Explanation: Let the speed of 2 trains be a1 and a2 Total distance covered to cross each other = (500 + 400)m = 900m When they run in the same direction, Relative speed = a1 - a2 = 900 /60 ... hr a 2= (15 * 18 / 5)m/s = 54km/hr Speed of two trains are 108 and 54 km/hr
Description : The live load to be considered for an inaccessible roof, is (A) Nil (B) 75 kg/m2 (C) 150 kg/cm2 (D) 200 kg/m
Description : The capacity of a classifier in 'tons of solid/hr' is given by (where, A = cross-sectional area in m2 , V = rising velocity of fluid in m/sec, S = percentage of solids in the suspension by volume, ρ = density of solids in kg/m3 ) (A) 3.6 AVS.ρ (B) 3.6 A.V.ρ (C) 3.6 A.S. ρ (D) 3.6 AVS/ρ
Last Answer : (A) 3.6 AVS.ρ
Description : Thermal diffusivity of a material (A) Has the unit m2 /sec (B) Is defined as K/ρ . Cp (C) Is the ratio of thermal conductivity to thermal capacity (D) All (A), (B) and (C)
Last Answer : (D) All (A), (B) and (C)
Description : The rough value of diffusion co-efficient of water vapor into air at 25°C may be about __________ cm2 /sec. (A) 0.25 (B) 2.5 (C) 1.25 (D) 0.0025
Last Answer : (A) 0.25
Description : The unit of volumetric diffusivity is (A) cm2 /sec (B) cm/sec (C) cm3 /sec (D) cm2 /sec
Last Answer : (A) cm2 /sec
Description : A fluid (µ/ρ) = 0.01 cm2 /sec is moving at critical flow condition (NRe = 2100) through a pipe of dia 3 cms. Velocity of flow is __________ cm/sec. (A) 7 (B) 700 (C) 7000 (D) 630
Last Answer : (A) 7
Description : Which of the following is not a dimension-less group used in catalysis? (Where, D = dispersion co-efficient, cm2 /sec.D1 = diffusion co-efficient; cm2 /sec L = length of the reactor, cm t = time, sec, v = volumetric ... (D/vL) (B) Reduced time (vt/V) (C) Thiele modulus L √(k/D1 ) (D) None of these
Last Answer : (D) None of these
Description : Unit of viscosity in CGS system is (A) gm .cm-1 sec-1 (B) gm . cm2 . sec-2 (C) gm .cm-2, sec-1 (D) gm . cm . sec-1
Last Answer : Option A
Description : The terminal velocity of a particle moving through a fluid varies as dp n . The value of n is equal to __________ in Stoke's law regime. (A) 1 (B) 0.5 (C) 2 (D) 1.5
Last Answer : (C) 2
Description : If cosec |-sin |=l and sec |- cos |=m, prove that l2m2(l2+m2+3)=1 -Maths 9th
Last Answer : cosec(A) - sin(A) = l ⇒ 1/sin(A) - sin(A) = l ⇒ l² = 1/sin²(A) + sin²(A) - 2 --------- sec(A) - cos(A) = m ⇒ 1/cos(A) - cos(A) = m ⇒ m² = 1/cos²(A) + cos²(A) - 2 ---------- l²m² = [1/sin²(A) + ... A)) = = 1/(sin²(A)cos²(A)) ------------- ⇒ l²m² (l² + m² + 3) = sin²(A)cos²(A) / [sin²(A)cos²(A)] = 1
Description : Specific capacity or yield of wells, is generally expressed, as (A) m 3 per sec (B) m 3 /hour (C) m 3 /hour/m2 (D) m 3 /hour/m2 /m
Last Answer : (D) m 3 /hour/m2 /m
Description : Pick out the wrong statement: (A) Change in barometric pressure does not affect the relative humidity (B) In case of a packed tower, the operating velocity is about half of the ... (D) The equilibrium moisture content of the solid can be reduced by increasing the absolute humidity
Last Answer : (D) The equilibrium moisture content of the solid can be reduced by increasing the absolute humidity
Description : Pick out the wrong statement. (A) Heat transfer by radiation cannot occur across an absolute volume (B) In case of a shell and tube heat exchanger, the pressure drop through the shell is ... The amount of heat involved in the condensation or vaporisation of 1 kg of a fluid is the same
Last Answer : (A) Heat transfer by radiation cannot occur across an absolute volume
Description : Pick out the wrong statement. (A) Cokes of high reactivity are obtained from weakly coking coals (B) Cokes of high reactivity are obtained from strongly coking coals (C) Reactivity of coke is inversely proportional to its absolute density (D) Abrasion index of the coke is a measure of its hardness
Last Answer : (B) Cokes of high reactivity are obtained from strongly coking coals
Description : Pick out the wrong statement. (A) In a static mass of liquid, the pressure at a point is the same for all liquids (B) Pressure decreases exponentially with elevation in an isothermal atmosphere (C) ... s law, the pressure at a point in a static or uniformly moving fluid is equal in all directions
Last Answer : (A) In a static mass of liquid, the pressure at a point is the same for all liquids
Description : Pick out the wrong statement. (A) Cp of monatomic gases such as metallic vapor is about 5 kcal/kg.atom (B) The heat capacity of solid inorganic substance is exactly equal to the ... isolated system (D) At absolute zero temperature, the heat capacity for many pure crystalline substances is zero
Last Answer : (C) There is an increase in entropy, when a spontaneous change occurs in an isolated system
Description : The coefficient of permeability of soils, is generally expressed in (A) cm/sec (B) cm/minute (C) cm2 /sec (D) cm2 /minute
Last Answer : (A) cm/sec
Description : Pick out the wrong statement. (A) The integral method of analysing kinetic data is used when the data is scattered (B) The differential method of analysing kinetic data requires more accurate ... less than one for identical feed composition, flow rate, conversion and for all positive reaction orders
Last Answer : (C) When the reaction rate is independent of temperature, the reaction is said to be of zero order
Description : Pick out the wrong statement. (A) Use of different catalysts in a reversible catalytic chemical reaction does not change the equilibrium composition (B) Alumina is added as a promoter to ... Arrhenius plot (D) Presence of inerts affects the equilibrium conversion of reactants in a chemical reaction
Last Answer : (C) Activation energy for a reaction is obtained from the intercept of the Arrhenius plot
Description : Pick out the wrong statemen (A) Autocatalytic reactions are exemplified by microbial fermentation reactions (B) The slowest step has the greatest influence on the overall reaction rate in case of an ... reaction (D) Hydrolysis of ester in presence of alkali or acid is a zero order reaction
Last Answer : (D) Hydrolysis of ester in presence of alkali or acid is a zero order reaction
Description : Pick out the wrong statement. (A) Conversion of SO2 to SO3 in Monsanto-4 pass converter is about 98% (B) The chemical formula of oleum is H2S2O7 , which is formed by saturating ... but technical sulphuric acid (D) Decomposition of sulphuric acid on heating does not start before its boiling
Last Answer : (D) Decomposition of sulphuric acid on heating does not start before its boiling