[nilesh]

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Hi buddy here I am looking for SSC Junior Engineer Previous Year Question Paper Civil engineering subject , so would you plz here provide me same here ??

[Vishal Kotkar]

As you want here I am giving SSC Junior Engineer Previous Year Question Paper Civil engineering subject on your demand :

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


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

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

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

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

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

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

Which surface will have the least emissivity ?

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

Correct Answer: Aluminium foil

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

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

Heat is transferred from an electric bulb by ______.

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

Correct Answer: Radiation

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)

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

With increase in temperature, thermal conductivity of air ______.

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

Correct Answer: Increases

Liquid metal having highest thermal conductivity is of _______.

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

Correct Answer: Sodium

Candidate Answer: Mercury

Minimum thermal diffusivity is of ______.

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

Correct Answer: Rubber

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

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