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Home » Engineering » Chemical Engineering » Aptitude Test - 20
1.If the weight of a body immersed in a fluid exceeds the buoyant force, then the body will
A. rise until its weight equals the buoyant force
B. tend to move downward and it may finally sink
C. float
D. rise until its weight equals the buoyant force
2.Metacentric height for small values of angle of heel is the distance between the
A. centre of gravity and centre of buoy-ancy
B. centre of gravity and metacentre
C. centre of buoyancy and metacentre
D. centre of gravity and centre of buoy-ancy
3. A floating body is said to be in a state of stable equilibrium
A. when its metacentric height is zero
B. when the metacentre is above the centre of gravity
C. when the metacentre is below the centre of gravity
D. when its metacentric height is zero
4. A rectangular block 2 m long, 1 m wide and 1 m deep floats in water, the depth of immersion being 0.5 m. If water weighs 10 kN/m3, then the weight of the block is
A. 5kN
B. lOkN
C. 15 kN
D. 5kN
5.The point in the immersed body through which the resultant pressure of the liquid may be taken to act is known as
A. centre of gravity
B. centre of buoyancy
C. centre of pressure
D. centre of gravity
6.If a vessel containing liquid moves downward with a constant acceleration equal to 'g' then
A. the pressure throughout the liquid mass is atmospheric
B. there will be vacuum in the liquid
C. the pressure in the liquid mass is greater than hydrostatic pressure
D. the pressure throughout the liquid mass is atmospheric
7.When a liquid rotates at a constant angular velocity about a vertical axis as a rigid body, the pressure intensity varies
A. linearly with radial distance
B. as the square of the radial distance
C. inversely as the square of the radial distance
D. linearly with radial distance
8. An open cubical tank of 2 m side is filled with water. If the tank is rotated with an acceleration such that half of the water spills out, then the acceleration is equal to
A. g/3
B. g/2
C. 2g/3
D. g/3
9.A right circular cylinder open at the top is filled with liquid and rotated about its vertical axis at such a speed that half the liquid spills out, then the pressure intensity at the centre of bottom
A. zero
B. one-fourth its value when cylinder was full
C. one-half its value when cylinder was full
D. zero
10.The horizontal component of force on a curved surface is equal to the
A. product of pressure intensity at its centroid and area
B. force on a vertical projection of the curved surface
C. weight of liquid vertically above the curved surface
D. product of pressure intensity at its centroid and area
11.The eddy viscosity for turbulent flow is
A. a function of temperature only
B. a physical property of the fluid.
C. dependent on the flow
D. a function of temperature only
12.The heat is absorbed by
A. Condenser
B. Evaporator
C. Compressor
D. Condenser
13.The Stefan Boltzman law states that
A. E α T
B. E α T2
C. E α T3
D. E α T
14.The body which absorbs all radiations incident upon it, is called as
A. Black body
B. White body
C. Opaque body
D. Black body
15.If the body is at thermal equilibrium, then the
A. Emissivity = absorptivity
B. Emissivity ˃ absorptivity
C. Emissivity ˂ absorptivity
D. Emissivity = absorptivity
16.In radiative heat transfer, a gray surface is one
A. which appears gray to the eye
B. whose emissivity is independent of wavelength
C. which has reflectivity equal to zero
D. which appears gray to the eye
17.Heat transfer takes place according to
A. First Law of Thermodynamics
B. Second Law of Thermodynamics
C. Third Law of Thermodynamics
D. First Law of Thermodynamics
18.Heat is mainly transferred by conduction, convection and radiation in
A. insulated pipes carrying hot water
B. refrigerator freezer coil
C. boiler furnaces
D. insulated pipes carrying hot water
19.The value of Biot number is very small (less than 0.01) when
A. The convective resistance of the fluid is negligible
B. The conductive resistance of the solid is negligible
C. The conductive resistance of the fluid is negligible
D. The convective resistance of the fluid is negligible
20.The ratio of energy transferred by convection to that by conduction is called
A. Stanton number
B. Nusselt number
C. Biot number
D. Stanton number
21.-What happens when the thickness of insulation on a pipe exceeds the critical value?
A. Heat transfer rate increases
B. Heat transfer rate decreases
C. Heat transfer rate remain constant
D. Heat transfer rate increases
22.In heat exchangers, the value of logarithmic mean temperature difference should be
A. maximum possible,
B. minimum possible,
C. zero;
D. maximum possible,
23.Air at 20° C blows over a plate of 50 cm x 75 cm maintained at 250° C. If the convection heat transfer coefficient is 25 W/m2 °C, the heat transfer rate is
A. 215.6 kW
B. 2156 kW
C. 2.156 kW
D. 215.6 kW
24.Units for thermal conductivity
A. J/kg.K
B. J/mol.K
C. J.ohm/sec.K2
D. J/kg.K
25.The process of heat transfer from one particle of the body to another without actual motion of the particle is called
A. Radiation
B. Conduction
C. Convection
D. Radiation
26.Fourier law of heat conduction is based on the assumption that
A. Heat flow through a solid is one dimensional
B. Heat flow is in steady state
C. Both (A) and (B)
D. Heat flow through a solid is one dimensional
27.Unit of thermal conductivity in M.K.S. units is
A. kcal/kg m2 °C
B. kcal-m/hr m2 °C
C. kcal/hr m2 °C
D. kcal/kg m2 °C
28.Thermal conductivity of solid metals with rise in temperature normally
A. Increases
B. Decreases
C. Remains Constant
D. Increases
29.When heat is transferred from one particle of hot body to another by actual motion of the heated particles, it is referred to as heat transfer by
A. Conduction
B. Convection
C. Radiation
D. Conduction
30.When heat is Transferred by molecular collision, it is referred to as heat transfer by
A. Conduction
B. Convection
C. Radiation
D. Conduction
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