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Recently added practice questions

8381. In case of steam engines the steam pressure is_______________?
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A. 10 to 15 kgf/cm2

B. 1 to 4 kgf/cm2

C. 25 to 35 kgf/cm2

D. 5 to 8 kgf/cm2

8382. In case of silt deposition in the dam reservoir to dispose of the effectively ________________ be used?
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A. All are correct

B. Vortex pipes

C. Silt excluders

D. Silt ejectors

8383. In case of planets the necessary acceleration is provided by______________?
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A. Centripetal force

B. Gravitational force

C. Frictional force

D. Coulomb force

8384. In case of physical adsorption, the difference between heat of adsorption and heat of normal condensation is_________________?
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A. Called integral heat of adsorption

B. Equal to the heat of formation of surface compound

C. Equal to the heat of wetting

D. Zero

8385. In case of liquids, the binary diffusivity is proportional to (where, T = temperature) _____________________?
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A. ?T

B. 1/T

C. T2

D. T
8386. In case of laminar flow of fluid through a circular pipe, the__________________?
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A. Shear stress over the cross-section is proportional to the distance from the surface of the pipe

B. Velocity profile varies hyperbolically and the shear stress remains constant over the crosssection

C. ume of circumscribing cylinder</strong>

D. Average flow occurs at a radial distance of 0.5 r from the centre of the pipe (r = pipe radius)

E. Surface of velocity distribution is a paraboloid of revolution, whose volume equals half the
8387. In case of hydraulically smooth pipe, the resistance to flow depends only on the Reynolds number, whereas for a hydraulically rough pipe, the resistance to flow is governed by the relative roughness. Two pipes are said to have the same hydraulic roughness, when they have equal values of___________________?
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A. Friction co-efficient for flows at equal Reynold number

B. Relative roughness

C. All A., B. & C.

D. Absolute roughness

8388. In case of hand mixing of concrete, the extra cement to be added is__________________?
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A. 10%

B. 20%

C. 5%

D. 15%

8389. In case of gas turbines, the gaseous fuel consumption guarantees are based on________________?
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A. net calorific value

B. calorific value

C. high heat value

D. middle heat value

E. low heat value
8390. In case of foundations on black cotton soils, the most suitable method to increase the bearing capacity of soils is to_________________?
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A. compact the soil

B. drain the soil

C. increase the depth of foundation

D. replace the poor soil
8391. In case of end to end connection of two or more pipes in series, the ______________ each pipe?
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A. Rate of flow in each pipe is proportional to the length of

B. Total flow rate is the sum of flow rate in

C. Head loss is same through

D. Same rate of flow passes through
8392. In case of dry spinning of polymers, the polymer solution in a volatile solvent is forced through the spinnerates into a warm air chamber, where the solvent evaporates leaving behind the polymer in the filament form. Dry spinning is used for _______________ fibres?
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A. PVC

B. Polyvinyl acetate

C. Rayon

D. Polythene

8393. In case of D.C. shunt motors the speed is dependent on back e.m.f. only because____________?
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A. flux is practically constant in D:C. shunt motors

B. back e.m.f. is equal to armature drop

C. flux is proportional to armature current

D. armature drop is negligible

8394. In case of D.C. machine winding, number of commutator segments is equal to______________?
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A. number of armature turns

B. number of armature conductors

C. number of armature coil sides

D. number of armature coils
8395. In case of cooling towers, the ratio of the rates of heat and mass transfer is indicated by the ______________ number ?
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A. None of these

B. Lewis

C. Grashoff

D. Sherwood

8396. In case of constant underflow extraction operation, the _______________________ at all solute concentration?
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A. Solids are drained to the same extent

B. Ratio of the insoluble to solution is constant

C. Both A. & B.

D. Neither A. nor B.

8397. In case of centrifugal fan or blower, the gas capacity varies as __________________?
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A. (Speed)0.5

B. Speed

C. (Speed)3

D. (Speed)2

8398. In case of an _______________ process, the temperature of the system increases?
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A. Isothermal expansion

B. Adiabatic expansion

C. Isothermal compression

D. Adiabatic compression
8399. In case of an ideal solution, the total vapor pressure varies ______________ with the composition expressed as mole fraction?
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A. Exponentially

B. None of these

C. Linearly

D. Inversely

8400. In case of an absorber, the operating _______________?
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A. Line can be either above or below the equilibrium curve

B. Line always lies below the equilibrium curve

C. Line always lies above the equilibrium curve

D. Velocity is more than the loading velocity

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