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Mechanical Engineering (SSC JE) Tests MCQs for Mechanical Engineering Exam
It covers all Important Questions with answers on Mechanical Engineering (SSC JE) Tests for the Mechanical Engineering exam. The questions are based on important topics. Details about the questions:- Topic: Mechanical Engineering (SSC JE) Tests
- Type of Questions: MCQs with solutions
- Number of Questions: 46
- You can attempt them on EduRev to score high in Mechanical Engineering exam.
The temperature at which the volume of a gasn becomes zero is called- a)absolute scale of temperature
- b)absolute zero temperature
- c)absolute temperature
- d)none of these
Correct answer is option 'B'. Can you explain this answer?
The temperature at which the volume of a gasn becomes zero is called
a)
absolute scale of temperature
b)
absolute zero temperature
c)
absolute temperature
d)
none of these
 | Tanvi Shah answered |
General gas equation
pv=mrt
at absolute zero kelvin temp.
pressure =zero
that means
0×v= mr×0
therefore volume will be zero at absolute zero kelvin temp.
pv=mrt
at absolute zero kelvin temp.
pressure =zero
that means
0×v= mr×0
therefore volume will be zero at absolute zero kelvin temp.
Work transfer between the system and the surroundings- a)Is a point function
- b)Is always given by
- c)Is a function of pressure only
- d)Depends on the path followed by the system
Correct answer is option 'D'. Can you explain this answer?
Work transfer between the system and the surroundings
a)
Is a point function
b)
Is always given by
c)
Is a function of pressure only
d)
Depends on the path followed by the system
 | Naroj Boda answered |
The work is the path function so the work transfer between the system and the surrounding depend on the path that followed by tha system.
The Young's modulus of a material is 125 GPa and Poissons ratio is 0.25.The modulus rigidityof the material is- a)30 GPa
- b)50 GPa
- c)80 GPa
- d)100 GPa
Correct answer is option 'B'. Can you explain this answer?
The Young's modulus of a material is 125 GPa and Poissons ratio is 0.25.The modulus rigidityof the material is
a)
30 GPa
b)
50 GPa
c)
80 GPa
d)
100 GPa
 | Gopal Choudhury answered |
Given parameters:
Young's modulus (E) = 125 GPa
Poisson's ratio (ν) = 0.25
Modulus of rigidity (G) is given by the formula:
G = E/ (2(1+ν))
Calculation:
G = 125/(2(1+0.25))
G = 50 GPa
Therefore, the modulus of rigidity of the material is 50 GPa.
Explanation:
Modulus of rigidity is a measure of a material's resistance to shearing deformation. It is the ratio of the shear stress to the shear strain. It is also known as shear modulus.
Young's modulus is a measure of a material's stiffness or resistance to deformation in response to an applied force. Poisson's ratio is a measure of the ratio of lateral strain to longitudinal strain when a material is subjected to an applied force.
Using the formula for modulus of rigidity, we can calculate it using Young's modulus and Poisson's ratio. In this case, we were given the values of Young's modulus and Poisson's ratio. Substituting these values in the formula, we get the modulus of rigidity as 50 GPa.
Conclusion:
The correct option for the given question is (B) 50 GPa.
Young's modulus (E) = 125 GPa
Poisson's ratio (ν) = 0.25
Modulus of rigidity (G) is given by the formula:
G = E/ (2(1+ν))
Calculation:
G = 125/(2(1+0.25))
G = 50 GPa
Therefore, the modulus of rigidity of the material is 50 GPa.
Explanation:
Modulus of rigidity is a measure of a material's resistance to shearing deformation. It is the ratio of the shear stress to the shear strain. It is also known as shear modulus.
Young's modulus is a measure of a material's stiffness or resistance to deformation in response to an applied force. Poisson's ratio is a measure of the ratio of lateral strain to longitudinal strain when a material is subjected to an applied force.
Using the formula for modulus of rigidity, we can calculate it using Young's modulus and Poisson's ratio. In this case, we were given the values of Young's modulus and Poisson's ratio. Substituting these values in the formula, we get the modulus of rigidity as 50 GPa.
Conclusion:
The correct option for the given question is (B) 50 GPa.
In a fillet welded joint, the weakest area of the weld is- a)toe
- b)root
- c)throat
- d)face
Correct answer is option 'C'. Can you explain this answer?
In a fillet welded joint, the weakest area of the weld is
a)
toe
b)
root
c)
throat
d)
face
 | Robot Khan answered |
The fillet welds are subjected to tensile stress. The minimum cross-section of the fillet is at the throat. Therefore the failure due to tensile stress occurs at the throat section. Thus the weakest area of the weld is the throat.
A manometer is used to measure- a)low pressure
- b)moderate pressure
- c)high pressure
- d)atomospheric pressure
Correct answer is option 'C'. Can you explain this answer?
A manometer is used to measure
a)
low pressure
b)
moderate pressure
c)
high pressure
d)
atomospheric pressure
 | Avinash Mehta answered |
Manometers are devices in which columns of a suitable liquid are used to measure the difference in pressure between two points or between a certain point and the atmosphere. Manometer is needed for measuring large gauge pressures. It is basically the modified form of the piezometric tube.
The viscosity of water with respect to air is about:- a) 50
- b) 55
- c) 60
- d) 65 times
Correct answer is option 'B'. Can you explain this answer?
The viscosity of water with respect to air is about:
a)
50b)
55c)
60d)
65 times  | Divya Banerjee answered |
Viscosity of Water with Respect to Air
Viscosity is defined as the measure of a fluid's resistance to flow. It is a property of fluids that describes the internal frictional forces that cause a fluid to resist flow. The viscosity of a fluid is dependent on the fluid's molecular structure and temperature.
Water and air are both fluids with different molecular structures, and hence, they have different viscosities. The viscosity of water with respect to air is about 55 times.
Explanation:
The viscosity of air at standard temperature and pressure (STP) is approximately 0.0000181 Pa.s, while the viscosity of water at STP is approximately 0.001 Pa.s. This means that water is approximately 55 times more viscous than air.
This difference in viscosity plays a crucial role in many fluid mechanics applications. For example, a fluid such as water will flow more slowly through a pipe than air, even if the pressure difference driving the flow is the same. The higher viscosity of water means that more energy is required to move it through a pipe, and this can result in higher pumping costs.
In summary, the viscosity of water is much higher than the viscosity of air, and this difference has significant implications for fluid mechanics applications.
Viscosity is defined as the measure of a fluid's resistance to flow. It is a property of fluids that describes the internal frictional forces that cause a fluid to resist flow. The viscosity of a fluid is dependent on the fluid's molecular structure and temperature.
Water and air are both fluids with different molecular structures, and hence, they have different viscosities. The viscosity of water with respect to air is about 55 times.
Explanation:
The viscosity of air at standard temperature and pressure (STP) is approximately 0.0000181 Pa.s, while the viscosity of water at STP is approximately 0.001 Pa.s. This means that water is approximately 55 times more viscous than air.
This difference in viscosity plays a crucial role in many fluid mechanics applications. For example, a fluid such as water will flow more slowly through a pipe than air, even if the pressure difference driving the flow is the same. The higher viscosity of water means that more energy is required to move it through a pipe, and this can result in higher pumping costs.
In summary, the viscosity of water is much higher than the viscosity of air, and this difference has significant implications for fluid mechanics applications.
The dimensions of surface tension are- a)N/m2
- b)J/m
- c)J/m2
- d)W/m
Correct answer is option 'C'. Can you explain this answer?
The dimensions of surface tension are
a)
N/m2
b)
J/m
c)
J/m2
d)
W/m
 | Rhea Reddy answered |
surface tension is often expressed as an amount of force exerted in the surface perpendicular to a line of unit length. The unit then is newtons per metre, which is equivalent to joules per square metre.
Measurement of temperature is based on which law of thermo dynamics?- a)Zeroth law of thermo dynamics
- b)First law of thermo dynamics
- c)Second law of thermo dynamics
- d)Third law of thermo dynamics
Correct answer is option 'A'. Can you explain this answer?
Measurement of temperature is based on which law of thermo dynamics?
a)
Zeroth law of thermo dynamics
b)
First law of thermo dynamics
c)
Second law of thermo dynamics
d)
Third law of thermo dynamics
 | Sagarika Patel answered |
law of thermodynamics is the basis for measurement of temperature and setting its scale. In simple word, Zeroth law of thermodynamics says that “When two bodies are separately in thermal equilibrium with the third body, then the two are also in thermal equilibrium with each other.”
In Oxy-acetelene gas welding, for complete combustion, the volume of oxygen required per unit of acetylene is- a)1
- b)1.5
- c)2
- d)2.5
Correct answer is option 'D'. Can you explain this answer?
In Oxy-acetelene gas welding, for complete combustion, the volume of oxygen required per unit of acetylene is
a)
1
b)
1.5
c)
2
d)
2.5
 | Pritam Das answered |
Complete Combustion in Oxy-acetylene Gas Welding
Complete combustion is an essential process in oxy-acetylene gas welding where the fuel gas, Acetylene, burns in the presence of oxygen gas to generate heat. During the process, the acetylene gas is decomposed into carbon and hydrogen, releasing a large amount of heat energy. The heat generated by the exothermic reaction is utilized to melt and join metallic components.
Volume of Oxygen Required for Complete Combustion
The volume of oxygen required for complete combustion in oxy-acetylene gas welding depends on the stoichiometric ratio of acetylene and oxygen. The stoichiometric ratio is the minimum ratio of oxygen required to burn a unit volume of acetylene gas completely.
The stoichiometric ratio for acetylene and oxygen is 1:2.5. It means that for every unit volume of acetylene gas, 2.5 units of oxygen gas are required to burn it completely. Therefore, the correct option for the volume of oxygen required per unit of acetylene is 2.5.
Conclusion
In summary, complete combustion is a critical process in oxy-acetylene gas welding, where the volume of oxygen required for complete combustion depends on the stoichiometric ratio of acetylene and oxygen. The stoichiometric ratio for acetylene and oxygen is 1:2.5, which means that for every unit volume of acetylene gas, 2.5 units of oxygen gas are required to burn it completely.
Complete combustion is an essential process in oxy-acetylene gas welding where the fuel gas, Acetylene, burns in the presence of oxygen gas to generate heat. During the process, the acetylene gas is decomposed into carbon and hydrogen, releasing a large amount of heat energy. The heat generated by the exothermic reaction is utilized to melt and join metallic components.
Volume of Oxygen Required for Complete Combustion
The volume of oxygen required for complete combustion in oxy-acetylene gas welding depends on the stoichiometric ratio of acetylene and oxygen. The stoichiometric ratio is the minimum ratio of oxygen required to burn a unit volume of acetylene gas completely.
The stoichiometric ratio for acetylene and oxygen is 1:2.5. It means that for every unit volume of acetylene gas, 2.5 units of oxygen gas are required to burn it completely. Therefore, the correct option for the volume of oxygen required per unit of acetylene is 2.5.
Conclusion
In summary, complete combustion is a critical process in oxy-acetylene gas welding, where the volume of oxygen required for complete combustion depends on the stoichiometric ratio of acetylene and oxygen. The stoichiometric ratio for acetylene and oxygen is 1:2.5, which means that for every unit volume of acetylene gas, 2.5 units of oxygen gas are required to burn it completely.
Which of the following operation is first performed ?- a)Spot
- b)Boring
- c)Tapping
- d)Drilling
Correct answer is option 'B'. Can you explain this answer?
Which of the following operation is first performed ?
a)
Spot
b)
Boring
c)
Tapping
d)
Drilling
| | Rajeev Menon answered |
Swiss physician Hans Christian Jacobaeus performed the first Laparoscopic surgery on humans. 1916. Austrian surgeon Hermann Schloffer performed boring the first splenectomy operation.
for an irreversible cycle is
The liquid used in manometers should have- a)low density
- b)high surface tension
- c)low surface tension
- d)high density
Correct answer is option 'D'. Can you explain this answer?
The liquid used in manometers should have
a)
low density
b)
high surface tension
c)
low surface tension
d)
high density
 | Vertex Academy answered |
The liquid used in manometers should have high density.To lower the column height, the manometers liquid must have a high density. Making the column height a reasonable limit is critical since manometers are used to measure high pressures.
Guest's theory is used for- a)brittle materials
- b)ductile materials
- c)elastic materials
- d)plastic materials
Correct answer is option 'B'. Can you explain this answer?
Guest's theory is used for
a)
brittle materials
b)
ductile materials
c)
elastic materials
d)
plastic materials
 | Yash Patel answered |
MAXIMUM SHEAR STRESS THEORY (GUEST's or TRESCA's THEORY)
According to this theory, the elastic failure occurs when the greatest shear stress reaches a value equal to the shear stress at elastic limit in a simple tension test. This is used for ductile material
A process, in which the temperature of the working substance remains constant during itsexpansion or compression, is called- a)isothermal process
- b)hyperbolic process
- c)adiabatic process
- d)polytropic proce
Correct answer is option 'A'. Can you explain this answer?
A process, in which the temperature of the working substance remains constant during itsexpansion or compression, is called
a)
isothermal process
b)
hyperbolic process
c)
adiabatic process
d)
polytropic proce
 | Anirban Khanna answered |
Iso- some (constant) where the temperature is constant the process is known as isothermal process.
An Otto cycle has a compression ratio of 8. If 250 kJ of work is extracted from the cycle, the heat rejected by the cycle isa)500 kJb)442.69 kJc)331.4 kJd)192.69 kJCorrect answer is option 'D'. Can you explain this answer?
| | Aditya Deshmukh answered |
Answer is d) 192.69 kJ
Efficiency η(otto) = 1 - [1/r^(γ - 1)] = W/(W + Q2) = 250/(250 + Q2)
=> 1 - [1/8^0.4] = 250/(250 + Q2)
Q2 = 192.69 kJ
The phenomenon of pre-ignition- a)always occurs in diesel engines
- b)never occurs in diesel engines
- c)always occurs in petrol engines
- d)increases the power output engines
Correct answer is option 'B'. Can you explain this answer?
The phenomenon of pre-ignition
a)
always occurs in diesel engines
b)
never occurs in diesel engines
c)
always occurs in petrol engines
d)
increases the power output engines
| | Rajeev Sharma answered |
Pre-ignition (or preignition) in a spark-ignition engine is a technically different phenomenon from engine knocking, and describes the event wherein the air/fuel mixture in the cylinder ignites before the spark plug fires. ... Many engines have suffered such failure where improper fuel delivery is present.
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