For heat flow through very thick walled cylinder, use _________mean
radius.
(A) Arithmetic
(B) Logarithmic
(C) Geometric
(D) Either (A) or (C)

1 Answer

Answer :

(B) Logarithmic

Related questions

Description : Pick out the correct statement. (A) Higher is the temperature of the radiating body, higher is the wavelength of radiation (B) Logarithmic mean area is used for calculating the heat flow rate ... ) Solid angle subtended by the finite surface at the radiating element is called the angle of incidence

Last Answer : (B) Logarithmic mean area is used for calculating the heat flow rate through a thick walled cylinder

Description : Which area is used in case of heat flow by conduction through a cylinder? (A) Logarithmic mean area (B) Arithmetic mean area (C) Geometric mean area (D) None of these

Last Answer : (A) Logarithmic mean area

Description : In case of heat transfer by conduction in a hollow cylinder, __________ mean area is used to calculate the heat transfer rate. (A) Geometric (B) Arithmetic (C) Logarithmic (D) Either (A), (B) or (C)

Last Answer : (C) Logarithmic

Description : Arithmetic mean area can be used in heat transfer problem to calculate the heat flow by conduction through a cylinder which is (A) Thin walled having the value of Ao Ai /< 2 (B) Thick walled (C) Having the value of Ao /Ai > 2 (D) Both (B) and (C)

Last Answer : (A) Thin walled having the value of Ao Ai /< 2

Description : In the equation Q = UAΔt; Δt 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

Last Answer : (C) Logarithmic mean temperature difference

Description : A two stage compressor is used to compress an ideal gas. The gas is cooled to the initial temperature after each stage. The intermediate pressure for the minimum total work requirement should be equal to ... final pressures respectively) (A) Logarithmic (B) Arithmetic (C) Geometric (D) Harmonic

Last Answer : (C) Geometric

Description : For minimum work input in a two stage compression process the intermediated pressure is the A. Arithmetic process of suction and discharge pressure B. Logarithmic mean of suction and discharge pressure C. Geometric mean of suction and discharge pressure D. Hyperbolic mean of suction and discharge

Last Answer : ANSWER : C

Description : Terminal point temperature differences between fluids in case of a heat exchanger is termed as (A) Approach (B) Log mean temperature difference (C) Arithmetic mean temperature difference (D) Geometric mean temperature difference

Last Answer : (A) Approach

Description : The transitional middle portion of a logistic curve follows (A) A geometric growth (B) A logarithmic growth (C) A first over curve (D) A constant rate

Last Answer : (D) A constant rate

Description : In a thick-cylinder pressurized from inside, the hoop stress is maximum at a) The center of the wall thickness b) the outer radius c) the inner radius d) both the inner and the outer radii

Last Answer : c) the inner radius

Description : A thick cylinder under pi and po will have maximum stress at the 1. Outer radius 2. Inner radius 3. Mean radius 4. None

Last Answer : 2. Inner radius

Description : A thick cylinder under internal fluid pressure’ pi will have maximum stress at the 1. Outer radius 2. Inner radius 3. Mean radius 4. None

Last Answer : 2. Inner radius

Description : A thick cylinder under external fluid pressure’ p0′ will have maximum stress at the 1. Outer radius 2. Inner radius 3. Mean radius 4. None

Last Answer : 2. Inner radius

Description : $ Hypnospores are the thick walled resting spores produced in some Algae. ! The megaspores of Pinus are also called hypnospores.

Last Answer : $ Hypnospores are the thick walled resting spores produced in some Algae. ! The megaspores of Pinus are also ... wrong D. If both As and R are wrong.

Description : What is the thick walled blood vessels?

Last Answer : veins

Description : Rod-shaped elongated thick-walled lignified dead cells found in seed coat of pulses (Legumes) are (a) Macrosciereids (b) Astrosclereids (c) Brachysclereids (d) Osteosclereids

Last Answer : Ans. ((a))

Description : The figure shows blood circulation in humans with labels A to D. Select the option which gives correct identification of label and functions of the part. (a) B - Capillary-Thin without muscle layer and ... blood to heart, pO2 = 95 mmHg (d) A - Artery-Thick walled and blood flows evenly

Last Answer : (c) D - Pulmonary vein-Takes oxygenated blood to heart, pO2 = 95 mmHg

Description : Gymnosperms are also called soft wood spermatophytes because they lack (a) cambium (b) phloem fibres (c) thick-walled tracheids(d) xylem fibres

Last Answer : (d) xylem fibres.

Description : Gymnosperms are also called soft wood spermatophytes because they lack (1) Xylem fibres (2) Cambium (3) Phloem fibres (4) Thick-walled tracheids

Last Answer : (4) Thick-walled tracheids

Description : Sauter mean diameter is the same as the __________ mean diameter. (A) Mass (B) Arithmetic (C) Volume-surface (D) Geometric

Last Answer : (C) Volume-surface

Description : In case of laminar flow of fluid through a circular pipe, the (A) Shear stress over the cross-section is proportional to the distance from the surface of the pipe (B) Surface of velocity distribution is a ... occurs at a radial distance of 0.5 r from the centre of the pipe (r = pipe radius)

Last Answer : (B) Surface of velocity distribution is a paraboloid of revolution, whose volume equals half the volume of circumscribing cylinder

Description : Difference between geometric and arithmetic growth? -Biology

Last Answer : answer:

Description : Which explains why the sequence 216 12 23 is arithmetic or geometric?

Last Answer : The sequence 216 12 23 is neither arithmetic nor geometric.

Description : According to Malthusian theory of population - (1) Population increases in geometric ratio, food supply increases in arithmetic ratio (2) Population increases in arithmetic ratio, food supply increases in ... (4) Population increases in a harmonic ratio, food supply increases in a arithmetic ratio

Last Answer : (1) Population increases in geometric ratio, food supply increases in arithmetic ratio Explanation: In his 1798 work, An Essay on the Principle of Population, Malthus ermined the relationship between population ... e. by the repeated addition of a uniform increment in each uniform interval of time).

Description : When a vertical wall is subjected to pressures due to liquid on both sides, the resultant pressure is the __________ of the two pressures. (A) Sum (B) Difference (C) Arithmetic mean (D) Geometric mean

Last Answer : Answer: Option B

Description : To calculate index number ----- mean is used (a) arithmetic (b) geometric © harmonic (d) none of the above.

Last Answer : (b) geometric

Description : According to Malthusian theory of population (1) Population increases in geometric ratio, food supply increases in arithmetic ratio (2) Population increases in arithmetic ratio, food supply increases in ... (4) Population increases in a harmonic ratio, food supply increases in a arithmetic ratio 

Last Answer : Population increases in geometric ratio, food supply increases in arithmetic ratio

Description : In an extended surface heat exchanger, fluid having lower co-efficient (A) Flows through the tube (B) Flows outside the tubes (C) Can flow either inside or outside the tubes (D) Should not be used as it gives very high pressure drop

Last Answer : (B) Flows outside the tubes

Description : The velocity profile for turbulent flow through a closed conduit is (A) Logarithmic (B) Parabolic (C) Hyperbolic (D) Linear

Last Answer : (A) Logarithmic

Description : In the following geometric primitives. which is not a solid entity of CSG modelling: a.Box b.Cone c.Cylinder d.Circle

Last Answer : d.Circle

Description : What is the critical radius of insulation (cms) for a metallic cylinder, if the convective heat transfer co-efficient with the ambient atmosphere is 5 W/m2. °K? Thermal conductivity of metal and insulation material are 40 and 0.1 W/m.°K respectively. (A) 2 (B) 8 (C) 10 (D) 40

Last Answer : (A) 2

Description : The overall resistance for heat transfer through a series of flat resistance, is the __________ of the resistances. (A) Average (B) Geometric mean (C) Product (D) Sum

Last Answer : (D) Sum

Description : In a counter flow heat exchanger, hot fluid enters at 170°C & leaves at 150°C, while the cold fluid enters at 50°C & leaves at 70°C. The arithmetic mean temperature difference in this case is __________ °C. (A) 20 (B) 60 (C) 120 (D) ∞

Last Answer : (D) ∞

Description : For turbulent flow in smooth circular pipe, the velocity distribution is a function of the distance 'd' measured from the wall of the pipe and the friction velocity 'v', and it follows a __________ relationship. (A) Logarithmic (B) Linear (C) Hyperbolic (D) Parabolic

Last Answer : (A) Logarithmic

Description : For laminar flow of Newtonian fluid in a circular pipe, the velocitydistribution is a function of the distance 'd' measured from the centre line of the pipe, and it follows a __________ relationship. (A) Logarithmic (B) Parabolic (C) Hyperbolic (D) Linear

Last Answer : (B) Parabolic

Description : case of condensers & evaporators operating under given terminal conditions, LMTD (logarithmic mean temperature difference) for counter flow as compared to that for parallel flow is (A) More (B) Less (C) Equal (D) Much more

Last Answer : Option C

Description : Each terminal bronchiole gives rise to a number of very thin, irregular walled and vascularised bag like structure called_____

Last Answer : Each terminal bronchiole gives rise to a number of very thin, irregular walled and vascularised bag like structure called_____

Description : Each terminal bronchiole gives rise to a number of very thin, irregular walled and vascularised bag like structure called_____

Last Answer : Each terminal bronchiole gives rise to a number of very thin, irregular walled and vascularised bag like structure called_____

Description : If the thermal conductivity of a wall material is independent of temperature, the steady state temperature distribution in the very large thin plane wall having steady, uniform surface temperature follows __________ ... (A) Hyperbolic (B) Parabolic (C) Linear (D) Logarithmic

Last Answer : (C) Linear

Description : If the thermal conductivity of a wall material is independent of temperature, the steady state temperature distribution in the very large thin plane wall having steady, uniform surface temperature follows __________ law. (A) Parabolic (B) Hyperbolic (C) Linear (D) Logarithmic

Last Answer : (A) Parabolic

Description : Muff coupling is designed as a ......... A. Thick cylinder B. Thin cylinder C. Solid shaft D. Hollow shaft

Last Answer : D. Hollow shaft

Description : In a thick cylindrical shell subjected to an internal pressure (p), the radial stress across the thickness of a cylinder is a) maximum at the outer surface and minimum at the inner surface b) maximum ... and zero at the outer surface d) maximum at the outer surface and zero at the inner surface

Last Answer : c) maximum at the inner surface and zero at the outer surface

Description : A thick cylinder is subjected to an internal pressure of 60 MPa. If the hoop stress on the outer surface is 150 MPa, then the hoop stress on the internal surface is a) 105 MPa b) 180 MPa c) 210 MPa d) 135 MPa.

Last Answer : c) 210 MPa

Description : Cylinder having inner diameter to wall thickness ratio less than 15 are a) Thin cylinders b) Thick Cylinders c) Moderate cylinders d) none of the above

Last Answer : b) Thick Cylinders

Description : The maximum strain in a thick cylinder under pi will be a) σh/E+μ σl/E b) σh/ E+ μσr/E c) σr/E+μ σl/E d) None

Last Answer : b) σh/ E+ μσr/E

Description : Power is __________. A. actual amount of power reference to 1mW B. logarithmic ratio of two powers C. definite amount of energy per time period D. current flow per time period

Last Answer : C. definite amount of energy per time period

Description : Capacity of a hydraulic accumulator is defined in terms of maximum (A) Amount of energy stored (B) Flow rate through accumulator (C) Rate of falling of ram (D) Volume available in the cylinder

Last Answer : (A) Amount of energy stored

Description : When hot liquid is poured into a thick glass tumbler, it cracks because glass – (1) is a bad conductor of heat so only inner surface expands (2) has high temperature coefficient of expansion (3) has a very low specific heat (4) has low temperature coefficient of expansion

Last Answer : (1) is a bad conductor of heat so only inner surface expands Explanation: When hot liquid is poured into a thick glass tumbler, it cracks because glass is a bad conductor of heat so only inner surface expands.

Description : When hot liquid is poured into a thick glass tumbler, it cracks because glass : (1) is a bad conductor of heat so only inner surface expands (2) has high temperature coefficient of expansion (3) has a very low specific heat (4) has low temperature coefficient of expansion

Last Answer :  is a bad conductor of heat so only inner surface expands