Staff Selection Commission Junior Engineer Civil Previous Papers

Hi buddy here I have come to get Staff Selection Commission Junior Engineer Civil Previous Papers, so can any one provide me same here ??

[pawan]

As you want here I am providing Staff Selection Commission Junior Engineer Civil Previous Papers , on your demand :


Options:
1) Grashoff number
2) Biot number
3) Stanton number
4) Prandtl number

Correct Answer: Biot number

QID : 802 - An ideal air compressor cycle (with clearance) on p-v diagram can be represented by processes.

Options:
1) one adiabatic, two isobaric, and one constant volume
2) two adiabatic and two isobaric
3) two adiabatic, one isobaric, and one constant volume
4) one adiabatic, one isobaric, and two constant volume

Correct Answer: two adiabatic and two isobaric

QID : 803 - In a shell and tube heat exchanger, baffles are provided on the shell side to ______.

Options:
1) Prevent the stagnation of shell side fluid
2) Improve heat transfer
3) Provide support for tubes
4) All options are correct

Correct Answer: All options are correct

QID : 804 - The ratio of the thickness of thermal boundary layer to the thickness of hydrodynamic boundary layer is equal to (Prandtl number)n, where n is______.

Options:
1) 1/3
2) 2/3
3) 1
4) 1

Correct Answer: - 1/3

QID : 805 - In regarding nucleate boiling _______.

Options:
1) The temperature of the surface is greater than the saturation temperature of the liquid
2) Bubbles are created by expansion of entrapped gas or vapour at small cavities in the surface
3) The temperature is greater than that of film boiling
4) All options are correct

Correct Answer: The temperature is greater than that of film boiling

QID : 806 - Boundary layer is defined as ______.

Options:
1) A thin layer at the surface where gradients of both velocity and temperature are small
2) A thin layer at the surface where velocity and velocity gradients are large
3) A thick layer at the surface where velocity and temperature gradients are large
4) A thin layer at the surface where gradients of both velocity and temperature are large

Correct Answer: A thin layer at the surface where gradients of both velocity and temperature are large

QID : 807 - Two insulating materials of thermal conductivity K and 2K are available for lagging a pipe carrying a hot fluid. If the radial thickness of each material is the same _____.

Options:
1) Material with higher thermal conductivity should be used for the inner layer and one with layer and one with lower thermal conductivity for the outer
2) Material with lower thermal conductivity should be used for the inner layer and one with higher thermal conductivity for the outer
3) It is immaterial in which sequence the insulating materials are used
4) None of these

Correct Answer: Material with lower thermal conductivity should be used for the inner layer and one with higher thermal conductivity for the outer

QID : 808 - Critical thickness of insulation for spheres is given by _____.

Options:
1) k/h
2) k/4h
3) h/2k
4) 2k/h

Correct Answer: 2k/h

QID : 809 - Which surface will have the least emissivity ?

Options:
1) Smooth glass
2) Plaster
3) Aluminium foil
4) Concrete

Correct Answer: Aluminium foil

QID : 810 - The process of heat transfer from one particle of the body to another without the actual motion of the particle, is known as ______ .

Options:
1) Conduction
2) Convection
3) Radiation
4) All options are correct

Correct Answer: Conduction

QID : 811 - The process of heat transfer from a hot body to a cold body in a straight line, without affecting the intervening medium, is known as ______.

Options:
1) Conduction
2) Convection
3) Radiation
4) All options are correct

Correct Answer: Radiation

QID : 812 - Heat is transferred from an electric bulb by ______.

Options:
1) Conduction
2) Convection
3) Radiation
4) All options are correct

Correct Answer: Radiation

QID : 813 - Assumption made in the Fourier's law is that the heat flow
A. Is in steady state
B. Through a solid medium in one dimension

Options:
1) Only (A)
2) Only (B)
3) Both (A) and (B)
4) None of these

Correct Answer: Both (A) and (B)

QID : 814 - If thermal conductivity of a material of wall varies as K_0 (1 + αt), then the temperature at the centre of the wall as compared to that in case of constant thermal conductivity, will be ______.

Options:
1) More
2) Less
3) Same
4) Depend on other factors

Correct Answer: More

QID : 815 - With increase in temperature, thermal conductivity of air ______.

Options:
1) Increases
2) Decreases
3) Remains the same
4) None of these

Correct Answer: Increases

QID : 816 - Liquid metal having highest thermal conductivity is of _______.

Options:
1) Sodium
2) Potassium
3) Lead
4) Mercury

Correct Answer: Sodium

Candidate Answer: Mercury

QID : 817 - Minimum thermal diffusivity is of ______.

Options:
1) Aluminium
2) Rubber
3) Iron
4) Lead

Correct Answer: Rubber

QID : 818 - Critical radius of a hollow cylinder is defined as _______.

Options:
1) Outer radius which gives maximum heat flow
2) Outer radius which gives minimum heat flow
3) Inner radius which gives minimum heat flow
4) Inner radius which gives maximum heat flow

Correct Answer: Outer radius which gives maximum heat flow

QID : 819 - Heat exchangers are used in

A. Condensers and boilers in steam plants
B. Radiators
C. Intercoolers and preheaters
D. Condensers and evaporators in refrigerators and air conditioners

Options:
1) Only A
2) Only B
3) Only C
4) A, B, C and D

Correct Answer: A, B, C and D

QID : 820 - Automobile radiator is a heat exchanger of _____ type.

Options:
1) Counter flow
2) Parallel flow
3) Cross flow
4) Regenerator

Correct Answer: Cross flow

QID : 821 - For a closed system, difference between the heat added to the system and work done by the gas, is equal to the change in_____.

Options:
1) Enthalpy
2) Entropy
3) Internal energy
4) Temperature

Correct Answer: Internal energy

QID : 822 - The sequence of process that eventually returns the working substance to its original state, is known as ______.

Options:
1) Event
2) Thermodynamic cycle
3) Thermodynamic property
4) None of these

Correct Answer: Thermodynamic cycle

QID : 823 - According to Kelvin-Plank's statement, a perpetual motion machine of _______.

Options:
1) First kind is possible
2) First kind is impossible
3) Second kind is impossible
4) Second kind is possible

Correct Answer: Second kind is impossible

QID : 824 - According to kinetic theory of gases, at absolute zero ______.

Options:
1) Specific heat of molecules reduces to zero
2) Kinetic energy of molecules reduces to zero
3) Volume of gas reduce to zero
4) Pressure of gas reduce to zero

Correct Answer: Kinetic energy of molecules reduces to zero

QID : 825 - According to Gay-Lussac's law for perfect gases, the absolute pressure of given mass varies directly as _______.

Options:
1) Temperature
2) Absolute temperature
3) Absolute temperature, if volume remains constant
4) Product of absolute temperature and volume

Correct Answer: Absolute temperature, if volume remains constant

QID : 826 - Three states of matter are distinguished with respect to molecules by the ______.

Options:
1) Atoms in molecules
2) Number
3) Orientation
4) Character of motion

Correct Answer: Character of motion

QID : 827 - Equal volume of all gases, at the same temperature and pressure, contain equal number of molecules. This is according to _______.

Options:
1) Charle's law
2) Avagardo's law
3) Joule's law
4) Gay Lussac law

Correct Answer: Avagardo's law

QID : 828 - Specific heat of a gas, Cp = Cv, at

Options:
1) Absolute zero
2) Critical temperature
3) Triple point
4) All temperatures

Correct Answer: Absolute zero

QID : 829 - The specific heat at constant volume of solids obeys Debye's T3 law at ______.

Options:
1) High temperatures
2) Low temperatures
3) High pressures
4) All temperatures

Correct Answer: All temperatures

QID : 830 - A reversible process _____.

Options:
1) Must pass through a continuous series of equilibrium states
2) Leaves no history of the events in surroundings
3) Must pass through the same states on the reversed path as on the forward path
4) All options are correct

Correct Answer: All options are correct

QID : 831 - In Red Wood Viscometer ______.

Options:
1) Absolute value of viscosity is determined
2) Part of the head of fluid is utilised in overcoming friction
3) Fluid discharges through orifice with negligible velocity
4) Comparison of viscosity is done

Correct Answer: Absolute value of viscosity is determined

QID : 832 - A rotameter is a device used to measure ______.

Options:
1) Velocity of fluid in pipes
2) Velocity of gauges
3) Votex flow
4) Flow of fluids

Correct Answer: Flow of fluids

QID : 833 - Steady flow occurs when ______.

Options:
1) Pressure does not change along the flow
2) Velocity does not change
3) Conditions change gradually with time
4) Conditions do not change with time at any point

Correct Answer: Conditions do not change with time at any point

QID : 834 - If the particles of a fluid attain such velocities that vary from point to point in magnitude and direction as well as from instant, the flow is _______.

Options:
1) Uniform flow
2) Steady flow
3) Turbulent flow
4) Laminar flow

Correct Answer: Turbulent flow

QID : 835 - Flow occurring in a pipeline when a valve is being opened is ______.

Options:
1) Steady
2) Unsteady
3) Laminar
4) Vortex

Correct Answer: Unsteady

QID : 836 - For measuring flow by a Venturimeter, it should be installed in _______.

Options:
1) Vertical line
2) Horizontal line
3) Inclined line with upward flow
4) In any direction and in any location

Correct Answer: In any direction and in any location

QID : 837 - A streamline is defined as the line ______.

Options:
1) Parallel to central axis flow
2) Parallel to outer surface to pipe
3) Of equal velocity in a flow
4) Along with the pressure drop is uniform

Correct Answer: Of equal velocity in a flow

QID : 838 - The purpose of surge tank in a pipe line is to _______.

Options:
1) Smoothen the flow of water
2) Compensate friction losses in pipe
3) Prevent occurrence of hydraulic jump
4) Relieve pressure due to water hammer

Correct Answer: Compensate friction losses in pipe

QID : 839 - The resultant upward pressure of a fluid on a floating body is equal to the weight of fluid displaced by the body. This definition is according to _______.

Options:
1) Buoyancy
2) Equilibrium of a floating body
3) Archimedes' principle
4) Bernoulli's theorem

Correct Answer: Buoyancy

QID : 840 - A balloon lifting in air follows the ______.

Options:
1) Law of gravitation
2) Archimedes principle
3) Principle of buoyancy
4) All options are correct

Correct Answer: All options are correct

QID : 841 - Hydraulic grade line as compared to the centre line of conduct ______.

Options:
1) Should be always above
2) Should be always below
3) Should always be parallel
4) May be above or below

Correct Answer: Should be always above

QID : 842 - A Piezometer cannot be used for pressure measurement in pipes when _______.

Options:
1) Pressure difference is low
2) Velocity is high
3) Fluid in the pipe is a gas
4) Fluid is highly viscous

Correct Answer: Fluid in the pipe is a gas

QID : 843 - A Hot Wire Anemometer is used for the measurement of ______.

Options:
1) Pressure of gases
2) Velocity of gases
3) Viscosity of gases
4) Viscosity of liquids

Correct Answer: Velocity of gases

QID : 844 - Friction drag is generally larger than the pressure drag in _______.

Options:
1) Flow past a sphere
2) Flow past a cylinder
3) Flow past an airfoil
4) Flow past a thin sheet

Correct Answer: Flow past a cylinder

QID : 845 - If one of the wall moves in the direction of flow with uniform velocity while the other wall is stationary, then the resulting flow between parallel walls is called ______.

Options:
1) Plug flow
2) Stokes flow
3) Couette flow
4) Eulers flow

Correct Answer: Plug flow

QID : 846 - The ratio of the energy absorbed by the body to total energy falling on it is called _____.

Options:
1) absorptive power
2) emissive power
3) emissivity
4) None of these

Correct Answer: absorptive power

QID : 847 - In a flow field, at the stagnation point _______.

Options:
1) Pressure is zero
2) velocity of fluid is zero
3) Pressure head is equal to velocity
4) All the velocity head is converted into pressure head

Correct Answer: velocity of fluid is zero

QID : 848 - Viscosity is the most important property in the ______.

Options:
1) Travel of a bullet through air
2) Water jet issuing from a fire air
3) Formation of soap bubbles
4) Flow of castor oil through a tube

Correct Answer: Formation of soap bubbles

QID : 849 - If pressure at any point in the liquid approaches the vapor pressure, liquid starts vaporising and creates pockets or bubbles of dissolved gases and vapours. This phenomenon is ______.

Options:
1) Surface tension
2) Adhesion
3) Vaporisation
4) Cavitation

Correct Answer: Surface tension

QID : 850 - The fluid forces considered in the Navier-Strokes equation are ______.

Options:
1) Gravity, pressure and viscous
2) Gravity, pressure and turbulent
3) Pressure, viscous and turbulent
4) Gravity, viscous and turbulent

Correct Answer: Gravity, pressure and viscous

QID : 851 - Hydraulic grade line for any flow system as compared to energy line is ______.

Options:
1) Above
2) Below
3) At same level
4) Uncertain

Correct Answer: Below

QID : 852 - To avoid vaporisation in the pipe line, the pipe line over the ridge is laid such that it is not more than _____.

Options:
1) 2.4 m above the hydraulic gradient
2) 6.4m above the hydraulic gradient
3) 10.0 m above the hydraulic gradient
4) 5.0 m above the hydraulic gradient

Correct Answer: 2.4 m above the hydraulic gradient

QID : 853 - The locus of elevations that water will rise in a series of pitot tube is called ______.

Options:
1) Hydraulic grade line
2) Pressure head
3) Energy grade line
4) Head loss

Correct Answer: Energy grade line

QID : 854 - Pressure in Pascals at a depth of 1 m below the free surface of a body of water will be equal to _______.

Options:
1) 1 Pa
2) 98.1 Pa
3) 981 Pa
4) 9810 Pa

Correct Answer: 9810 Pa