Mock Test: SSC JE (ME)- 4
100 Questions MCQ Test Mechanical Engineering SSC JE (Technical) | Mock Test: SSC JE (ME)- 4
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An insulated rigid vessel contains a mixture of fuel and air. The mixture is ignited by a minutespark. The contents of the vessel experience.
When an ideal gas with constant specific heats is throttled adiabatically, with negligible changes in
kinetic and potential energies.
kinetic and potential energies.
Which of the following relationships is valid only for reversible processes undergone by a closedsystem of simple compressible substance (neglect changes in kinetic and potential energy) ?
Q = dU + PdV
Reversible closed system
TdS = du + Pdv
0 holds good forAt the triple point of a pure substance, the number of degrees of freedom is
The standard value of atmospheric pressure taken at sea level is
For a perfect gas, according to Boyle's law
where p = Absolute pressure,
v = Volume, and
T = Absolute temperature
The general law for the expansion or compression of gases, is
The property of working substance which increases or decreases as the heat is supplied orremoved in a reversible manner, is known as
The use of Refrigerant R–22 for temperature below – 30º is not recommended due to its
In the window air conditioner, the expansion device used is
In a reversed Brayton cycle, the heat is absorbed by the air during
The power output from a spark ignition engine is varied by
Knocking tendency in a SI engine reduces with increasing
Correct Answer :- c
Explanation : A valve is a device that regulates, directs or controls the flow of a fluid (gases, liquids, fluidized solids, or slurries) by opening, closing, or partially obstructing various passageways.
According to this, In diesel Engine three Valves are one for Intake Air, 2nd for Exhaust gas and 3rd is for Fuel (Injector).
A economizer in a steam generator performs the function of
For a given set of operating pressure limits of a Rankine cycle the highest efficiency occurs for
In steam and other vapour cycle, the process of removing non-condensable is called
Correct Answer :- B
Explanation : In the steam and other vapour cycle the process of removing non-condensable gas is known as scavenging process.
A gas turbine cycle with heat exchange and reheating improves
A gas turbine cycle with infinitely large number of stages during compression and expansionleads to
The high steam and low water safety valve is not used in
For the stability of a floating body, under the influence of gravity alone, which of the followingis TRUE ?
Streamlines, path lines and streak lines are virtually identical for
Steam turbines are used extensively in both large and small power plants to generate electrical power. Coal-fired, gas-fired, nuclear, and biomass fuels can be used to generate steam for steam turbine plants.
The pressure of a liquid measured with the help of a piezometer tube is
A body floating in a liquid is said to be in neutral equilibrium, if its metacentre
The total head of a liquid particle in motion is equal to
The specific speed of a turbine is given by the equation
A stone of mass m at the end of a string of length l is whirled in a vertical circle at a constant speed.The tension is the string will be maximum when the stone is
A steel wheel of 600 mm diameter on a horizontal steel rail. It carries a load of 500 N. Thecoefficient of rolling resistance is 0.3 The force in Newton, necessary to roll the wheel along therail is
A 1 kg block is resting on a surface with coefficient of friction μ = 0.1. A force of 0.8 N isapplied to the block as shown in the figure. The friction force is
A cylindrical elastic body subjected to pure torsion about its axis develops
A rod of length L and diameter D is subjected to a tensile load P. Which of the following is sufficientto calculate the resulting change in diameter ?
An elastic body is subjected to a tensile stress X in a particular direction and a compressive stressY in its perpendicular direction. X and Y are unequal in magnitude. On the plane of maximumshear stress in the body there will be
In terms of Poisson's ratio (m) the ratio of Young's Modulus (E) to Shear Modulus (G) of
elastic materials is
A long thin walled cylindrical shell, closed at both the ends, is subjected to an internal pressure.The ratio of the hoop stress (circumferential stress) to longitudinal stress developed in the shellis
A concentrated load P acts on a simply supported beam of span L at a distance L/3 from the left
support. The bending moment at the point of application of the load is given by
A cantilever beam of length L is subjected to a moment M at the free end. The moment of inertia of the beam cross section about the neutral axis is I and the Young's modulus is E. The magnitude of the maximum deflection is
A bolt is made to pass through a tube and both of them are tightly fitted with the help of washersand nuts. If the nut is tightened, then
The ratio of shear modulus to the modulus of elasticity for a elasticity for a Poisson's ratio of0.4 will be
According to Euler's column theory, the crippling load for a column of length (l) with one end fixed and the other end hinged, is
The number of degrees of freedom of a five link planer mechanism with five revolute pairs asshown in the figure is
For the planar mechanism shown in figure select the most appropriate choice ofr the motion oflink 2 when link 4 is moved upwards:
When a cylinder is located in a Vee-block, the number of degrees of freedom which are arrestedis
List -I (Gear types)
a. Worm gears
b. Cross helical gears
c. Bevel gears
d. Spur gears
List – II (Application)
1. Parallel Shafts
2. Nonparallel, intersecting shafts
3. Non parallel, nonintersecting shafts
4. Large speed ratios
As shown in figure, a mass of 100 kg is held between two springs. The natural frequency of
vibration of the system in cycle/s, is
When the two elements of a pair have a surface contact when relative motion takes place and thesurface of one element slides over the surface of the other, the pair formed is known as a
The centre distance between two meshing involute gears is equal to
In the design of shafts made of ductile materials subjected to twisting moment and bendingmoment, the recommended theory of failure is
The outside diameter of a hollow shaft that is twice its inside diameter the ratio of its torquecarrying capacity to that of a solid shaft of the same material and the same outside diameter is
which theory of failure will you use for aluminium components under steady loading is
Torque to weight ratio for a circular shaft transmitting power is directly proportional to the
In thick film hydrodynamic journal bearings the coefficient of friction
Match the correct combination for following metal working processes.
Processes
P. Blanking
Q. Stretch Forming
R. Coining
S. Deep Drawing
Associated state of stress
1. Tension
2. Compression
3. Shear
4. Tension and Compression
5. Tension and shear
For gas welding a particular job using a neutral oxyacetylene flame the acetylene consumptionwas 10 liters. The oxygen consumption from the cylinder in liters will be
Correct Answer :- D
Explanation : The process of preheating involves heating the area around the weld joint or the entire part to a specified temperature before welding. This reduces the cooling rate of the weld and drives out moisture, which in turn helps prevent hydrogen buildup and the potential for cracking.
The standard specification of a grinding wheel is A-46=M-6-V-21. It means a wheel of
Crater wear always starts at some distance from the tool tip because at the point
The bond formed by transferring electrons from one atom to another is called
The rake angle required to machine brass by high speed steel tool is
The factor considered for evaluation of machinability is
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