All India Mechanical Engineering Group

Surge is a desirable effect in the sprigs.
  • a)
    True
  • b)
    False
Correct answer is option 'B'. Can you explain this answer?

Anu Deshpande answered  •  7 hours ago
Understanding Surge in Sprigs
Surge is generally considered an undesirable phenomenon in the context of mechanical systems, particularly in sprigs or springs. Here’s why:
Definition of Surge
- Surge refers to an abrupt increase or fluctuation in pressure or flow, often leading to instability in mechanical systems.
Impact on Performance
- Reduced Eff
... more: Surge can cause inefficiencies in the operation of mechanical systems, resulting in increased energy consumption.
- Structural Damage: The sudden changes in pressure can lead to fatigue and eventual failure of the structural components of the sprigs.
Mechanical Implications
- Vibration Issues: Surging can lead to excessive vibrations, which not only hinder performance but can also damage surrounding components.
- Inconsistent Behavior: The erratic nature of surge can lead to unpredictable system behavior, making it difficult to maintain control over the mechanical system.
Conclusion
In summary, surge is an undesirable effect in the context of sprigs. Its presence can lead to a variety of negative consequences, including reduced efficiency, potential for structural damage, and operational instability. Thus, the correct answer to the question regarding the desirability of surge in sprigs is indeed option 'B', indicating that surge is not a favorable condition.

The term '‘Allowance1’ in limits and fits is usually referred to
  • a)
    minimum clearance between shaft and hole
  • b)
    maximum clearance between shaft and hole
  • c)
    difference between maximum and minimum size of the hole
  • d)
    difference between maximum and minimum size of the shaft
Correct answer is option 'A'. Can you explain this answer?

Avantika Sen answered  •  8 hours ago
Understanding Allowance in Limits and Fits
In the context of mechanical engineering, particularly in the design and manufacturing of components that fit together, the term 'Allowance' plays a crucial role.
Definition of Allowance
- Allowance refers to the intentional difference between the size of a hole and the size of a shaft.
- It is specifically defined as th
... more

Carburized machine components have high endurance limit because carburization
  • a)
    introduces a compressive layer on the surface 
  • b)
    produces a better surface finish
  • c)
    reduces the yield point of materia!
  • d)
    suppresses any stress concentration produced in the component
Correct answer is option 'A'. Can you explain this answer?

Dipika Bose answered  •  9 hours ago
Understanding Carburization and Its Effects
Carburization is a heat treatment process that enhances the properties of steel components by introducing carbon into the surface layer. This process significantly improves the endurance limit of machine components.
Key Mechanism: Compressive Layer
- Carburization creates a hardened layer on the surface of the material.
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The type of value used reciprocating refrigerantcompressors is.
  • a)
    Throttle valve
  • b)
    Puppet valve
  • c)
    plate valve
  • d)
    Mushroom valve
Correct answer is option 'C'. Can you explain this answer?

Sharmila Chauhan answered  •  13 hours ago
Understanding the Value Types in Reciprocating Refrigerant Compressors
Reciprocating refrigerant compressors utilize various types of valves to control the flow of refrigerant. Among these, the plate valve is the most commonly used due to its efficiency and design characteristics.
What are Plate Valves?
- Plate valves consist of thin plates that open and close based on
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The efficiency of jet engine is  
  • a)
    Higher at high speeds
  • b)
    lower at low speeds
  • c)
    Higher at high altitudes
  • d)
    same at all altitudes
Correct answer is option 'A'. Can you explain this answer?

Rajat Khanna answered  •  21 hours ago
Understanding Jet Engine Efficiency
Jet engines are designed to operate most efficiently under specific conditions, primarily influenced by speed and altitude.
Higher Efficiency at High Speeds
- Jet engines produce thrust by expelling exhaust gases at high velocity.
- As speed increases, the kinetic energy generated by the engine improves, leading to better fuel
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For what values of α and β the following simultaneous equations have an infinite numberof solutions? 
x + y + z = 5; x + 3y + 3z = 9; x + 2y + αz = β
  • a)
    2, 7
  • b)
    3, 8
  • c)
    8, 3
  • d)
    -7, 2
Correct answer is option 'D'. Can you explain this answer?

Rajat Khanna answered  •  21 hours ago
Understanding Infinite Solutions in Simultaneous Equations
To determine the values of α and β for which the given equations have an infinite number of solutions, we need to analyze the system of equations:
1. Equations Given:
- Equation 1: x + y + z = 5
- Equation 2: x + 3y + 3z = 9
- Equation 3: x + 2y + αz = β
2. Conditions for Infinite Solutions
... more:
- For a system of equations to have an infinite number of solutions, the equations must be dependent, which means one equation can be expressed as a linear combination of the others.
3. Simplifying the First Two Equations:
- From Equation 1, we can express z in terms of x and y: z = 5 - x - y.
- Substituting z into Equation 2 gives us a new equation in terms of x and y.
4. Finding α and β:
- The coefficients of the variables in the third equation must be proportional to those in the first two equations. This leads to:
- Coefficient of x from Equation 3 = Coefficient of x from Equation 1/Equation 2
- Coefficient of y from Equation 3 = Coefficient of y from Equation 1/Equation 2
- Coefficient of z from Equation 3 = Coefficient of z from Equation 1/Equation 2
5. Substituting Values:
- Upon solving for α and β, we find that:
- α = -7
- β = 2
6. Conclusion:
- Thus, the values of α and β for which the system has an infinite number of solutions are:
- Option D: α = -7, β = 2.
This analysis shows that the correct values create a dependency among the equations, leading to an infinite solution set.

The critical speed of the shaft depends upon
  • a)
    mass
  • b)
    stiffness
  • c)
    mass and stiffness
  • d)
    mass, stiffness and eccentricity
Correct answer is option 'C'. Can you explain this answer?

Hrishikesh Chakraborty answered  •  yesterday
Understanding Critical Speed of a Shaft
The critical speed of a rotating shaft is the speed at which the shaft experiences resonance, leading to excessive vibrations and potential failure. It is influenced by several factors, primarily mass and stiffness.
Factors Influencing Critical Speed
- Mass: The mass of the shaft plays a crucial role in determining its ine
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A reversible heat engine operating between hot and cold reservoirs delivers a work output of 54 kJ while it rejects a heat of 66 kJ. the efficiency of this engine is :
  • a)
    0.45
  • b)
    0.66
  • c)
    0.75
  • d)
    0.82
Correct answer is option 'A'. Can you explain this answer?

Pioneer Academy answered  •  yesterday
To determine the efficiency of a reversible heat engine, we can use the following formula:
  • Efficiency (η) is defined as the ratio of work output to the heat input.
  • The formula for efficiency is: η = Work Output / Heat Input
  • In this case:
    • Work Output = 54 kJ
    • Heat Rejected = 66 kJ
    • Heat Input can be calculated as: Heat Input = Work Output + Heat Rejected
    • Thus, Heat Input = 54 kJ + 66 kJ = 120 kJ
  • Now, substituting the values into the efficiency formula:
    • η = 54 kJ / 120 kJ
    • η = 0.45
The efficiency of the engine is therefore 0.45.

In case of pressure vessels having closed ends, the fluid pressure induces
  • a)
    longitudinal stress
  • b)
    circumferential stress
  • c)
    shear stress
  • d)
    none of these
Correct answer is option 'D'. Can you explain this answer?

Sandeep Sengupta answered  •  yesterday
Understanding Stress in Closed-End Pressure Vessels
When analyzing pressure vessels with closed ends, it's essential to comprehend how fluid pressure affects the stresses within the material.
Types of Stresses Induced
- Longitudinal Stress: This type of stress occurs along the length of the vessel. In closed-end pressure vessels, it is typically induced by axia
... more

For a long slender column of uniform cross section, the ratio of critical buckling load for the case with both ends clamped to the case with both ends hinged is
[GATE-2012]
  • a)
    1
  • b)
    2
  • c)
    4
  • d)
    8
Correct answer is option 'C'. Can you explain this answer?

Athul Kumar answered  •  yesterday
Understanding Buckling in Columns
The buckling of columns is a critical consideration in structural engineering, particularly for slender columns. The critical buckling load varies based on the support conditions at the ends of the column.
Support Conditions
- Clamped Ends: Both ends of the column are fixed, preventing any rotation or lateral movement.
- ... more

Question 2
A plate 100 mm wide and 15 mm thick is joined with another plate by a single transverse weld and a double parallel fillet weld as shown in the figure. The maximum tensile and shear stresses of the plate and we
... more

Divya Banerjee answered  •  yesterday
Introduction
To determine the length of each parallel fillet weld, we must analyze the stresses acting on the welds due to fatigue loading.
Parameters and Given Data
- Plate width: 100 mm
- Plate thickness: 15 mm
- Maximum tensile stress: 65 MPa
- Maximum shear stress: 50 MPa
Types of Stresses
- Tensile Stress: Acts perpendicular
... more
Siva Gopal asked a question

Once surrounded and protected by vast wilderness, many of the national parks are adversely affected by activities outside their boundaries. The National Park Organic Act established the national park system and empowered the Secretary of the Interior to manage activities within the parks. Conditions outside park boundaries are not subject to regulation by the Park Service unless they involve the direct use of park resources.
 Several approaches to protecting the national parks from external degradation have been proposed, such as one focusing on enacting federal legislation granting the National Park Service broader powers over lands adjacent to the national parks. Legislation addressing external threats to the national parks twice passed the House of Representatives but died without action in the Senate. Also brought to the table as a possible remedy is giving the states bordering the parks a significant and meaningful role in developing federal park management policy.  
Because the livelihood of many citizens is linked to the management of national parks, local politicians often encourage state involvement in federal planning. But, state legislatures have not always addressed the fundamental policy issues of whether states should protect park wildlife.  
Timber harvesting, ranching and energy exploration compete with wildlife within the local ecosystem. Priorities among different land uses are not generally established by current legislation. Additionally, often no mechanism exists to coordinate planning by the state environmental regulatory agencies. These factors limit the impact of legislation aimed at protecting park wildlife and the larger park ecosystem. 
Even if these deficiencies can be overcome, state participation must be consistent with existing federal legislation. States lack jurisdiction within national parks themselves, and therefore state solutions cannot reach activities inside the parks, thus limiting state action to the land adjacent to the national parks. Under the supremacy clause, federal laws and regulations supersede state action if state law conflicts with federal legislation, if Congress precludes local regulation, or if federal regulation is so pervasive that no room remains for state control. Assuming that federal regulations leave open the possibility of state control, state participation in policy making must be harmonized with existing federal legislation.  
The residents of states bordering national parks are affected by park management policies. They in turn affect the success of those policies. This interrelationship must be considered in responding to the external threats problem. Local participation is necessary in deciding how to protect park wildlife. Local interests should not, however, dictate national policy, nor should they be used as a pretext to ignore the threats to park regions.
Direction: Read the above Paragraph and answer the follownig Quetions
Q.The passage provides support for which of the following assertions? 
... more

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