Mock Test: SSC JE (ME)- 6
100 Questions MCQ Test Mechanical Engineering SSC JE (Technical) | Mock Test: SSC JE (ME)- 6
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Which one of the following is not the correct statement about control volume?
Heat transferred to a closed stationary system at constant volume is equal to
The first law of thermodynamics is dQ= du+dw. (Where symbols have usual meaning) For a chemical system dw= pdv, but when the volume is constant, dv=0 and, dQ=du. So, under the condition of constant volume heat transferred is equal to the change in the internal Energy of the system.
It is desired to bring about a certain change in the state of a system by performing work on thesystem under adiabatic conditions.
Key concept in analyzing the filling of an evacuated tank is
In the vander waal’s equation, the unit of constant a is
The....... states that changes of internal energy of a perfect gas is directly proportional to the change of temperature.
When gas is heated at constant pressure, the heat supplied is utilised in
A reversible heat engine runs between high temperature T1 and low temperature T2. The work output of this heat engine is used to run a reversible refrigeration cycle absorbing heat at temperature T2. What is the COP of the combined system ?
Superheating is a refrigeration cycle decrease coefficient of performance. In practice, there is a loss of 1% of COP for every 2.5C of superheating in suction line. The lining of suction lines is a solution to minimize undesirable heat accumulation.
Hence, the answer is decreases COP.
Hydrogen is used in electrolux refrigeration system so as to ....... the rate of evaporation ofthe liquid ammonia passing through the evaporator.
Engine of different cylinder dimensions, power and speed are compared on the basis of
Match the List-I (IC engine parts) with List-II (Materials) following :
When the engines are built to withstand the same thermal and mechanical stresses
The float in the carburetor of a petrol engine controls
In an I.C. engine, the process of removing the burnt gases from the combustion chamber of the engine cylinder is known as
The crown of the fire box is made hemispherical in order to
Which of the following is not the desirable property of a good fuel?
Reheating of steam under ideal condition takes place at constant
Reheating of steam under ideal condition takes place at constant temperature.In reheating type boiler-turbine plant the heat/energy transferred into the steam per kilo is higher and enthalpy loss in condenser is relatively lower (it is always constant kJ/kg).
Atomic number of an element in the periodic table represents the numbers of
Match List-I (Turbine types) with List-II (Flow direction) the following:
The device attached to the steam chest for preventing explosions due to excessive internal pressure of steam is called
The condition of 'no slip' at boundaries is applicable to
The fluid which obey's the Newton's law of viscosity 
is called
A curved surface is submerged in a static liquid. The horizontal component of pressure force on it is equal to
The drag coefficient of laminar flow varies with Reynolds number (Re) as
The ratio of specific weight of a liquid to the specific weight of pure water at a standard temperature is called
If a body floating in a liquid returns back to its original position, when given a small angular displacement, the body is said to be in
A flow through a long pipe at decreasing rate is called
At a given instant in time the conditions at every point are the same, but will change with time. An example is a pipe of constant diameter connected to a pump pumping at a constant rate which is then switched off.
The total energy of a liquid particle in motion is equal to
The stress-strain curve for glass during tensile test would exhibit
The number of elastic constants for a completely anisotropic elastic material are
In terms of bulk modulus (K) and modulus of rigidity (G), the Poisson's ratio can be expressed
as
If two or more shaft of different material, diameter or basic forms are connected together in such a way that each carries the same torque, then the shafts are said to be connected in series.
The property of a material by virtue of which it can be beaten or rolled into plates is called
A rod is enclosed centrally in a tube and the assembly is tightened by rigid washers. If the assembly is subjected to a compressive load, then
The product of Young's modulus (E) and moment of inertia (I) is known as
Which of the following is the correct torsion equation ?
Match List-I with List-II:
List-I
a. Maximum normal stress theory
b. Maximum principal strain theory
c. Maximum shear stress theory
List-II
1. Mise's and Henkey's theory
2. Rankine's theory
3. St Venant's theory
4. Guest's Tresca's theory
A machine having an efficiency greater than 50%, is known as
Reversible machine : A machine which is capable of doing work in the reverse direction even after the removal of effort ,load get lifted is called Reversible machine.
{for reversible machine efficiency will be greater than 50%}
Which one of the following graph represents Von-Mises yield criterion
Which of the following joint is commonly used for pipes carrying water at low pressure
In a gib and cotter joint, the gib and cotter are subjected to
The endurance of fatigue limit is defined as the maximum value of the stress which a polishedstandard specimen can without failure, for infinite number of cycles, when subjected to
Match the List -I (Kinematic pair) with List - II (Application)
The Grubler's criteria for planar mechanism is given by f = 3(n–1) –2I
What does I represent in the above equation?
For a simple mechanism, the degree of freedom (F) is given by Grubler’s criterion:
F = 3(n - 1) - 2l - h
where l = number of revolute joints/lower pair
n = number of links
h = number of higher pairs
The instantaneous center of a slider moving in a curved surface lies
When the nature of contact between the elements of a pair is such that it can only slide relative tothe other, the pair is known as a
The height of a Watt's governor (in metres) is equal to
Which of the following materials requires highest shrinkage allowance ?
Cast iron = 10mm/m
Steel=20mm/m
Aluminium = 15mm/m
Brass =15 mm/m
Therefore steel needs highest pattern allowance.
Which of the following casting mould uses metal moulds ?
Which of the following casting mould uses metal moulds ?
What does hydrostatic pressure in extrusion process improve ?
Which of the following is an example of orthogonal cutting ?
Which of the following material has maximum malleability ?
The iron ore mostly used for the production of pig iron is
Which of the following welding process uses nonconsumable electrodes ?
The angle made by the face of the tool and the plane parallel to the base of cutting tool is called
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