I.O.F. Chargemen Mechanical Online Mega Test

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    The word HTTP is stand for

    • Hyper text transfer protocal
    • Hyper text transfer point
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    • None of the above
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About This Quiz

The I. O. F. Chargemen Mechanical Online Mega Test assesses knowledge in manufacturing processes, focusing on grinding wheels, reaming, and milling. It evaluates understanding of materials, tolerances, and specifications essential for precision in mechanical engineering.

Mechanical Engineering Quizzes & Trivia

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  • 2. 

    DCXW FEVU HGTS ?

    • LKPQ

    • ABZ

    • JIRQ

    • LMRS

    Correct Answer
    A. JIRQ
    Explanation
    The given pattern in the question is that each letter in the first group is shifted one position forward in the alphabet to get the corresponding letter in the second group. Similarly, each letter in the second group is shifted one position forward in the alphabet to get the corresponding letter in the third group. Following this pattern, the letter 'D' in the first group would be shifted one position forward to get 'E' in the second group. Continuing this pattern, the missing fourth group would be 'JIRQ', as each letter in the third group would be shifted one position forward in the alphabet.

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  • 3. 

    Amit, Sumit and Puneet share an amount of Rs. 660 in the ratio of 3:4:5 what is the share of Puneet

    • Rs. 375

    • Rs. 275

    • Rs. 575

    • Rs. 675

    Correct Answer
    A. Rs. 275
    Explanation
    In the given question, the total ratio of the amount shared by Amit, Sumit, and Puneet is 3+4+5=12. Puneet's share is 5 out of 12 parts. To find Puneet's share, we divide Rs. 660 in the ratio of 5:12. The calculation is (5/12) * 660 = Rs. 275. Therefore, Puneet's share is Rs. 275.

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  • 4. 

    Which one of the Equipments used to Transform Mechanical energy into Electrical energy

    • Electric motor

    • Dynamo

    • Mechanical Engine

    • Loudspeaker

    Correct Answer
    A. Dynamo
    Explanation
    A dynamo is a device that converts mechanical energy into electrical energy. It consists of a rotating coil of wire, called an armature, inside a magnetic field. When the armature rotates, it cuts through the magnetic field, inducing an electric current in the wire. This current can be used to power electrical devices or stored in batteries. In contrast, an electric motor converts electrical energy into mechanical energy, a mechanical engine converts chemical energy into mechanical energy, and a loudspeaker converts electrical energy into sound energy. Therefore, the correct answer is Dynamo.

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  • 5. 

    What is the value of Escape Velocity from the Earth Surface

    • 11.2 km/s

    • 2.4 km/s

    • 1.732 km/s

    • 22.4 km/s

    Correct Answer
    A. 11.2 km/s
    Explanation
    The value of escape velocity from the Earth's surface is 11.2 km/s. Escape velocity is the minimum velocity an object needs to escape the gravitational pull of a planet or celestial body. In this case, it refers to the speed required for an object to completely leave Earth's gravitational field. At 11.2 km/s, an object would have enough kinetic energy to overcome Earth's gravitational force and not be pulled back down.

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  • 6. 

    A Dynameter is a device used for the measurement of

    • Chip thickness ratio

    • Forces during metal cutting

    • Wear of the cutting tool

    • Deflection of cutting tool

    Correct Answer
    A. Forces during metal cutting
    Explanation
    A Dynameter is a device used to measure the forces that occur during metal cutting. This device helps in analyzing and understanding the forces that act on the cutting tool and the workpiece during the cutting process. By measuring these forces, it becomes possible to optimize the cutting parameters and improve the efficiency and quality of the cutting operation.

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  • 7. 

    Which one of the ountry is the largest producer of Gold

    • Australiya

    • South africa

    • USA

    • England

    Correct Answer
    A. South africa
    Explanation
    South Africa is the correct answer because it is the largest producer of gold in the world. The country has been a major player in the gold industry for many years and has significant gold reserves. South Africa's gold production is attributed to its rich mineral deposits and well-established mining infrastructure. The country's gold mining industry contributes significantly to its economy and has made South Africa a global leader in gold production.

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  • 8. 

    Find the least number which being divided by 9, 12, 16, and 30 leaves in each case a remainder 3 ?

    • 623

    • 723

    • 728

    • None of the above

    Correct Answer
    A. 723
    Explanation
    The correct answer is 723 because it is the smallest number that, when divided by 9, 12, 16, and 30, leaves a remainder of 3 in each case.

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  • 9. 

    A man sold 250 chairs and and had a gain equal to selling price of 50 chairs. His profit percent is:

    • 5%

    • 10%

    • 25%

    • 50%

    Correct Answer
    A. 25%
    Explanation
    The man sold 250 chairs and had a gain equal to the selling price of 50 chairs. This means that the selling price of 50 chairs is equal to the cost price of 250 chairs. Therefore, the profit made by selling 250 chairs is 50 chairs. To find the profit percentage, we need to calculate the profit as a percentage of the cost price. Since the profit is 50 chairs and the cost price is 250 chairs, the profit percentage is (50/250) * 100 = 20%. Therefore, the answer of 25% is incorrect.

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  • 10. 

    Kinamatic Viscosity is Given by

    • Dynamic Viscosity/ Density

    • Product of dynamic viscosity and density

    • Density/dynamic viscosity

    • Dynamic Viscosity /momentum

    Correct Answer
    A. Dynamic Viscosity/ Density
    Explanation
    The correct answer is "dynamic Viscosity/ Density". This is because kinematic viscosity is defined as the ratio of dynamic viscosity (a measure of a fluid's resistance to flow) to density (a measure of a fluid's mass per unit volume). Therefore, the kinematic viscosity is calculated by dividing the dynamic viscosity by the density.

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  • 11. 

    Specific Heat is the amount of heat required to raise the temperature

    • By unit degree of substance

    • By unit degree of a unit mass

    • Of a unit mass by 10

    • None of the above

    Correct Answer
    A. By unit degree of a unit mass
    Explanation
    The specific heat is a measure of how much heat energy is needed to raise the temperature of a given amount of substance by one degree. It is expressed as the amount of heat required per unit degree of a unit mass of the substance. This means that it takes a certain amount of heat energy to increase the temperature of one unit of mass of the substance by one degree. Therefore, the correct answer is "by unit degree of a unit mass."

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  • 12. 

    The Detective agency "Research and analysis wing" is the intelligence agency of

    • USA

    • Australia

    • India

    • United Kingdom

    Correct Answer
    A. India
    Explanation
    The correct answer is India because the detective agency "Research and Analysis Wing" is commonly known as RAW, which is the primary foreign intelligence agency of India. It is responsible for gathering and analyzing intelligence information from foreign countries to assist in national security and foreign policy decision-making. RAW plays a crucial role in safeguarding India's interests and ensuring the country's security.

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  • 13. 

    After an increment of 7 in both the numerator and denominator, a fraction change to 3:4 . Find the orinal fraction

    • Numerator : 5, Denominator : 12

    • Numerator : 7, Denominator : 9

    • Numerator : 2 , Denominator : 5

    • Numerator : 3 , Denominator : 8

    Correct Answer
    A. Numerator : 2 , Denominator : 5
    Explanation
    If we increment both the numerator and denominator of a fraction by the same value, the ratio between the numerator and denominator remains the same. In this case, the original fraction has a ratio of 5:12. When we increment both the numerator and denominator by 7, the new fraction has a ratio of 12:19. However, none of the given options match this ratio. Therefore, the correct answer is not available.

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  • 14. 

    A men is facing north-west. He turns 90 degree in the clockwise direction and then 135 degree in the anticlockwise direction. Which direction is he facing Now. ?

    • East

    • West

    • North

    • South

    Correct Answer
    A. West
    Explanation
    After turning 90 degrees in the clockwise direction, the man will be facing north. Then, when he turns 135 degrees in the anticlockwise direction, he will be facing west. Therefore, the direction he is facing now is west.

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  • 15. 

    By Doping impurities. The electrical conductivity of semiconducter is

    • Increase

    • Decrease

    • Remains same

    • Not of the above

    Correct Answer
    A. Increase
    Explanation
    The electrical conductivity of a semiconductor can be increased by doping impurities. Doping refers to the intentional introduction of impurities into a semiconductor material to alter its electrical properties. By adding impurities, additional charge carriers are introduced, either by creating extra electrons (n-type doping) or by creating electron deficiencies called "holes" (p-type doping). These extra charge carriers increase the electrical conductivity of the semiconductor, allowing it to conduct electricity more effectively. Therefore, the correct answer is "increase".

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  • 16. 

    Process of reducing ore with carbon in the presence of flux is called

    • Quenching

    • Smelting

    • Shaping

    • None of the above

    Correct Answer
    A. Smelting
    Explanation
    Smelting is the correct answer because it refers to the process of reducing ore with carbon in the presence of flux. This process involves heating the ore with carbon, such as charcoal or coke, in a furnace to extract the desired metal. The carbon acts as a reducing agent, combining with the oxygen in the ore to form carbon dioxide and leaving behind the metal. Flux, such as limestone or silica, is added to the furnace to remove impurities and help facilitate the smelting process. Therefore, smelting accurately describes the process of reducing ore with carbon in the presence of flux.

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  • 17. 

    Wheel loading in grinding is defined as

    • Types of wheel bond fracture

    • Types of wheel grain fracture

    • Sticking of small particle on grinding wheel

    • None of the above

    Correct Answer
    A. Sticking of small particle on grinding wheel
    Explanation
    Wheel loading in grinding is defined as the phenomenon where small particles from the workpiece adhere to the surface of the grinding wheel during the grinding process. This can lead to a decrease in the cutting efficiency of the wheel, causing it to become less effective in removing material from the workpiece. Wheel loading can result in poor surface finish, increased heat generation, and reduced wheel life. Therefore, it is important to regularly clean and dress the grinding wheel to prevent wheel loading and maintain optimal grinding performance.

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  • 18. 

    In turning of slender rods, it is necessory to keep the transverse force minimium mainly to

    • Improve the surface finish

    • Increase productivity

    • Improve cutting efficiency

    • Reduce vibrations and chatter

    Correct Answer
    A. Reduce vibrations and chatter
    Explanation
    Reducing vibrations and chatter is necessary in turning slender rods because these phenomena can negatively impact the surface finish, productivity, and cutting efficiency. Vibrations and chatter can cause the tool to vibrate and chatter against the workpiece, leading to poor surface finish, increased tool wear, and decreased cutting efficiency. By minimizing the transverse force, the likelihood of vibrations and chatter occurring is reduced, resulting in improved overall machining performance.

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  • 19. 

    According to kinectic theory of gases, at absolute zero

    • Specific heat of molecules reduced to zero

    • Kinectic energy of molecules reduced to zero

    • Volume of gas reduce to zero

    • Pressure of gas reduced to zero

    Correct Answer
    A. Kinectic energy of molecules reduced to zero
    Explanation
    According to the kinetic theory of gases, at absolute zero, the kinetic energy of molecules reduces to zero. This is because at absolute zero, the temperature is at its lowest possible value, causing the molecules to have minimal or no movement. Since kinetic energy is directly related to the movement of particles, when there is no movement, the kinetic energy is reduced to zero.

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  • 20. 

    Binding material used in cemented carbide tools is

    • Nickel

    • Cobalt

    • Chromium

    • Silicon

    Correct Answer
    A. Cobalt
    Explanation
    Cobalt is the correct answer because it is commonly used as a binding material in cemented carbide tools. Cemented carbide, also known as tungsten carbide, is a hard and durable material used in cutting tools, drills, and other applications. Cobalt acts as a binder in cemented carbide, holding the tungsten carbide particles together and providing strength and toughness to the tool. It helps improve the wear resistance and overall performance of the tool, making it suitable for various industrial applications.

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  • 21. 

    The fatigue life of a part Can be improved by

    • Electroplating

    • Polishing

    • Coating

    • Shot peening

    Correct Answer
    A. Shot peening
    Explanation
    Shot peening is a process in which small metal particles, called shot, are forcefully propelled onto the surface of a part. This creates compressive stresses on the surface, which helps to improve the fatigue life of the part. The shot peening process induces plastic deformation in the surface layer, which enhances the resistance of the part to fatigue crack initiation and propagation. This makes shot peening an effective method for improving the fatigue strength and durability of parts, ultimately increasing their overall fatigue life.

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  • 22. 

    If the perimeter of a rectangle and a square each is equal to 80 cm and the difference of their areas is 100 sq cm. The sides of the rectangle are:

    • 35 cm, 15 cm

    • 30 cm, 10 cm

    • 28 cm, 12 cm

    • 25 cm, 15 cm

    Correct Answer
    A. 30 cm, 10 cm
    Explanation
    Let the length and width of the rectangle be L and W respectively. The perimeter of the rectangle is given by 2(L + W) = 80. Simplifying the equation gives L + W = 40. The area of the rectangle is given by L * W. The area of the square is given by S^2, where S is the side length of the square. The difference of their areas is 100, so L * W - S^2 = 100. Substituting L + W = 40 into the equation gives (40 - W) * W - S^2 = 100. By trial and error, we find that when W = 10 and S = 10, the equation is satisfied. Therefore, the sides of the rectangle are 30 cm and 10 cm.

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  • 23. 

    Centre of Pressure on an inclined plane is

    • At the centroid

    • Above the centroid

    • Below the centroid

    • At metacentre

    Correct Answer
    A. Below the centroid
    Explanation
    The center of pressure on an inclined plane is below the centroid because the pressure distribution on the inclined plane is not uniform. The pressure is higher at the bottom of the plane and decreases as we move upwards. This results in a net force acting at a point below the centroid, causing the center of pressure to be below the centroid.

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  • 24. 

    Presently Which one of the Following is a chief minister of Uttarakhand

    • Jitan Ram manjhi

    • Prakash singh Badal

    • Vijay Bahuguna

    • Harish Rawat

    Correct Answer
    A. Harish Rawat
    Explanation
    Harish Rawat is the correct answer because he is presently serving as the Chief Minister of Uttarakhand. The other options, Jitan Ram Manjhi, Prakash Singh Badal, and Vijay Bahuguna, are not relevant to Uttarakhand and are not currently holding the position of Chief Minister in that state.

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  • 25. 

    Which one of the following is a cabinet minister of Agriculture Department

    • Radha Mohan Singh

    • Thavar singh Gehlot

    • Kalraj Mishra

    • M. Vainkaiya Naidu

    Correct Answer
    A. Radha Mohan Singh
    Explanation
    Radha Mohan Singh is a cabinet minister of the Agriculture Department.

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  • 26. 

    The sum of the two numbers is 15 and their geometric mean is 20% lower than their arithmetric mean. Find the numbers

    • 11, 4

    • 12, 3

    • 13, 2

    • 10, 5

    Correct Answer
    A. 12, 3
    Explanation
    The sum of the two numbers is 15, which means that when we add the two numbers together, they equal 15. The geometric mean is 20% lower than the arithmetic mean, which means that the geometric mean is equal to 80% of the arithmetic mean. By setting up an equation, we can solve for the numbers. Let the two numbers be x and y. We have the following equations: x + y = 15 and (xy)^0.5 = 0.8((x + y)/2). Solving these equations, we find that x = 12 and y = 3.

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  • 27. 

    Which of the following is hardest materials next to diamond

    • Aluminium oxide

    • Silicon carbide

    • Cubic boron nitride

    • Cemented carbide

    Correct Answer
    A. Cubic boron nitride
    Explanation
    Cubic boron nitride is the hardest material next to diamond. It has a similar crystal structure to diamond, which gives it exceptional hardness and resistance to wear. This material is often used in cutting tools and abrasives for grinding and machining applications where high levels of hardness and durability are required.

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  • 28. 

    Ramesh can do a work in 10 days and Suresh can do the same work in 20 days. They work together for 5 days and then Ramesh goes away. In how many more days will Suresh finish the work

    • 5 days

    • 6.5 days

    • 9 days

    • 10 days

    Correct Answer
    A. 5 days
    Explanation
    Ramesh can complete the work in 10 days, which means he can do 1/10th of the work in a day. Suresh can complete the work in 20 days, so he can do 1/20th of the work in a day. When they work together for 5 days, they complete a total of (1/10 + 1/20) * 5 = 3/10th of the work. This means that there is still 1 - 3/10 = 7/10th of the work remaining. Since Suresh is the only one working now, he will take 7/10 * 20 = 14 days to complete the remaining work. Therefore, Suresh will finish the work in 5 + 14 = 19 days.

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  • 29. 

    How many terms there in the Arithmetic Progression 20, 25, 30, ............130

    • 22

    • 23

    • 21

    • 24

    Correct Answer
    A. 23
    Explanation
    In an arithmetic progression, each term is obtained by adding a constant difference to the previous term. In this case, the common difference is 5 (25 - 20 = 5), and the last term is 130. To find the number of terms, we can use the formula for the nth term of an arithmetic progression: an = a1 + (n-1)d, where an is the nth term, a1 is the first term, n is the number of terms, and d is the common difference. Plugging in the values, we get 130 = 20 + (n-1)5. Simplifying the equation, we have 110 = 5n - 5. Solving for n, we find that n = 23. Therefore, there are 23 terms in the arithmetic progression.

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  • 30. 

    A body floats in stable equilibrium

    • When its metacentre height is zero

    • When metacentre is sbove C.g.

    • When its c.g is below its centre of Buoyancy

    • None of the above

    Correct Answer
    A. When metacentre is sbove C.g.
    Explanation
    A body floats in stable equilibrium when its metacentre is above its center of gravity. This means that the point at which the buoyant force and the weight of the body intersect, known as the metacentre, is located above the center of gravity. This configuration ensures that any small disturbance or tilting of the body will cause a restoring moment that brings the body back to its original position. This is important for stability, as it prevents the body from easily tipping over or capsizing.

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  • 31. 

    A milling cutter having 8 teeth is rotating at 150 rpm. if the feed per tooth is 0.1 mm, the value of thew table speed in mm/min is

    • 120

    • 187

    • 125

    • 70

    Correct Answer
    A. 120
    Explanation
    The table speed is calculated by multiplying the number of teeth on the milling cutter by the rotation speed and the feed per tooth. In this case, the milling cutter has 8 teeth, the rotation speed is 150 rpm, and the feed per tooth is 0.1 mm. Therefore, the table speed would be 8 x 150 x 0.1 = 120 mm/min.

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  • 32. 

    Consider the following statements regarding NC machine tools

    • They reduce non productive time

    • They reduce fixturing

    • Niether 1 nor 2

    • Both 1 and 2

    Correct Answer
    A. Both 1 and 2
    Explanation
    NC machine tools are able to reduce non-productive time and fixturing. Non-productive time refers to the time spent on tasks that do not directly contribute to the production process, such as setting up the machine or changing tools. NC machine tools can automate these tasks, reducing the time wasted on non-productive activities. Additionally, these tools can also minimize fixturing requirements by using computer-controlled positioning and alignment, eliminating the need for extensive manual adjustments and setups. Therefore, both statements 1 and 2 are correct.

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  • 33. 

    In a solid circular bar subject to torsion, the shear stress is

    • Zero at extreme fibre and varies linearly to maxium value at axis

    • Zero at axis and varies linearly to maximum value at extreme fibre

    • Zero at extreme fibre and varies parabolically to the maximum value at axis

    • Zero at axis and varies parabolically to the maximum value at extreme fibre

    Correct Answer
    A. Zero at axis and varies linearly to maximum value at extreme fibre
    Explanation
    In a solid circular bar subject to torsion, the shear stress is zero at the axis because there is no shear force acting on the axis. As we move away from the axis towards the extreme fiber, the shear stress increases linearly. This is because the shear force increases with the distance from the axis, resulting in a linear variation of shear stress. At the extreme fiber, the shear stress reaches its maximum value. Therefore, the correct answer is "Zero at axis and varies linearly to maximum value at extreme fiber."

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  • 34. 

    In a unit cell of a body centered cubic space lattice the total number of atoms is

    • 6

    • 9

    • 14

    • 24

    Correct Answer
    A. 9
    Explanation
    In a body-centered cubic (BCC) space lattice, each corner of the unit cell is shared by 8 neighboring unit cells, contributing 1/8th of an atom to the unit cell. Additionally, there is 1 atom located at the center of the unit cell. Therefore, the total number of atoms in a BCC unit cell is 1 + 1/8 = 9.

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  • 35. 

    A Grinding wheel of 150mm diameter is rotating at 3000 rpm. The grinding speed is

    • 7.5 Ï€ m/s

    • 15Ï€ m/s

    • 45Ï€ m/s

    • 450Ï€ m/s

    Correct Answer
    A. 7.5 π m/s
    Explanation
    The grinding speed can be calculated using the formula: speed = (Ï€ * diameter * rpm) / 60. Substituting the given values, we get (Ï€ * 150 * 3000) / 60 = 7.5Ï€ m/s.

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  • 36. 

    The process of producing components in moulds without the application of pressure, is known as

    • Moulding

    • Laminating

    • Casting

    • Calendering

    Correct Answer
    A. Casting
    Explanation
    Casting is the correct answer because it refers to the process of producing components in moulds without the application of pressure. In casting, a liquid material, such as metal or plastic, is poured into a mould and allowed to solidify. This process is commonly used in manufacturing to create various products, such as metal parts, sculptures, and even dental restorations. Unlike moulding, laminating, and calendering, casting does not involve the application of pressure to shape the material.

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  • 37. 

    IRNSS Stands For The

    • Indian Remote Navigation Satellte System

    • Indian Regional Navigation Satellite System

    • Internation Remote Navigation Satellite System

    • International Regional Navigation Satellite System

    Correct Answer
    A. Indian Regional Navigation Satellite System
    Explanation
    The correct answer is Indian Regional Navigation Satellite System. IRNSS is an acronym for Indian Regional Navigation Satellite System, which is a satellite-based navigation system developed by the Indian Space Research Organisation (ISRO). It is designed to provide accurate positioning and timing services in India and the surrounding regions.

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  • 38. 

    The National institute for Oceanography is situated in

    • Panaji

    • Pune

    • Bangalore

    • Roorkee

    Correct Answer
    A. Panaji
    Explanation
    The National Institute for Oceanography is situated in Panaji. Panaji is the capital city of the Indian state of Goa, which is known for its beautiful beaches and coastal areas. It is an ideal location for the National Institute for Oceanography as it provides easy access to the Arabian Sea and a diverse marine ecosystem for research and study purposes.

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  • 39. 

    In a mixture of 80 litres of milk and water 25% of the mixture is milk. How much water should be added to the mixture so that milk becomes 20% of the mixture

    • 20 litres

    • 15 litres

    • 25 litres

    • None of the above

    Correct Answer
    A. 20 litres
    Explanation
    To find the solution, we need to determine the amount of milk in the initial mixture. Since 25% of the mixture is milk, we can calculate that 80 * 0.25 = 20 litres of milk. To make milk 20% of the mixture, we need to add water. Let's assume we add 'x' litres of water. The total volume of the mixture will then be 80 + x litres. As per the question, milk should be 20% of the mixture, so 0.2 * (80 + x) = 20. Solving this equation, we find that x = 20 litres. Therefore, 20 litres of water should be added to the mixture.

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  • 40. 

    In powder metallurgy, the operation carried out to improve the bearing property of a bush is called

    • Infilteration

    • Impregnation

    • Plating

    • Sintering

    Correct Answer
    A. Impregnation
    Explanation
    Impregnation is the operation carried out in powder metallurgy to improve the bearing property of a bush. This process involves filling the porous structure of the bush with a lubricant or a solid material to enhance its performance and reduce friction. Impregnation helps to increase the load-carrying capacity and wear resistance of the bush, making it suitable for bearing applications.

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  • 41. 

    Cold shortness is defined as the

    • Fracture in room temperature below their recrystallization temperature

    • Brittelness in room temperature below their recrystallization temperature

    • Loss of ductility above recrystallization temperature

    • Decrease of brittleness in room temperature

    Correct Answer
    A. Brittelness in room temperature below their recrystallization temperature
    Explanation
    Cold shortness refers to the brittleness of a material at room temperature when it is below its recrystallization temperature. This means that the material becomes more prone to fracturing or breaking when exposed to stress or impact at lower temperatures. The loss of ductility and decrease in brittleness occur above the recrystallization temperature, not below it. Therefore, the correct answer is brittleness in room temperature below their recrystallization temperature.

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  • 42. 

    The pressure in pascals at a depth of 1 m below the free surface of a body of water will be equal to

    • 1 Pa

    • 98.1 Pa

    • 981 Pa

    • 9810 Pa

    Correct Answer
    A. 9810 Pa
    Explanation
    The pressure in a body of water increases with depth due to the weight of the water above it. This is known as hydrostatic pressure. The pressure at a depth of 1 m below the free surface of the water will be equal to the weight of the water column above it, which is 9810 Pa.

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  • 43. 

    Among the conventional, machining process maximium specifiec energy is consumed in

    • Grinding

    • Drilling

    • Planing

    • Turnig

    Correct Answer
    A. Grinding
    Explanation
    Grinding consumes the maximum specific energy among the conventional machining processes. This is because grinding involves the use of abrasive particles to remove material from a workpiece, which requires a significant amount of energy. The abrasive particles continuously remove small chips from the workpiece surface, resulting in high friction and heat generation. This high energy consumption is necessary to achieve the desired surface finish and dimensional accuracy in grinding operations.

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  • 44. 

    A Lead Screw with half nuts in a lathe, Free to Rotate in both Direction has

    • V-threads

    • Whithworth threads

    • Buttress threads

    • ACME threads

    Correct Answer
    A. ACME threads
    Explanation
    ACME threads are the correct answer because they are commonly used in lead screws with half nuts in lathes. ACME threads have a trapezoidal shape with a 29-degree thread angle, which allows for smooth and efficient movement in both directions. They are designed to withstand heavy loads and provide high accuracy and repeatability. ACME threads are widely used in applications where precise linear motion is required, such as in CNC machines and industrial equipment.

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  • 45. 

    The correct sequence of the given materials in descending order of their weldability is

    • Mild steel, Copper, Cast Iron, Al

    • Cast iron, Al, Mild steel, Copper

    • Copper, Cast iron, Mild steel, Al

    • Al, Cast iron, Copper, Mild steel

    Correct Answer
    A. Mild steel, Copper, Cast Iron, Al
    Explanation
    The correct sequence of materials in descending order of their weldability is mild steel, copper, cast iron, and aluminum. This means that mild steel has the highest weldability, followed by copper, cast iron, and aluminum. Weldability refers to how easily a material can be welded or joined together using various welding techniques. In this case, mild steel is the most weldable material, while aluminum is the least weldable.

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  • 46. 

    Which one of the following instrument used in Light Detector Test

    • Polygraph

    • Udometer

    • Cardiogram

    • Odometer

    Correct Answer
    A. Polygraph
    Explanation
    A polygraph is an instrument used in a Light Detector Test. A polygraph, also known as a lie detector, measures and records several physiological indicators such as blood pressure, pulse, respiration, and skin conductivity while a person is being questioned. It is commonly used in investigations or interrogations to determine if someone is being truthful or deceptive.

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  • 47. 

    When the column is fixed at both ends, corresponding Euler critical load is

    • Ï€2 E I/L2

    • 2Ï€2 E I/L2

    • 3Ï€2 E I/L2

    • 4Ï€2 E I/L2

    Correct Answer
    A. 4Ï€2 E I/L2
    Explanation
    When a column is fixed at both ends, the corresponding Euler critical load can be calculated using the formula 4Ï€^2 E I/L^2. This formula takes into account the modulus of elasticity (E), the moment of inertia (I), and the length of the column (L). The critical load represents the maximum load that the column can sustain without buckling, and it is directly proportional to the square of the length and inversely proportional to the modulus of elasticity and the moment of inertia. Therefore, the correct answer is 4Ï€^2 E I/L^2.

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  • 48. 

    Bearing alloy preferred for light loads bearing is

    • Phospher bronze

    • White metal

    • Monel metal

    • Bronze

    Correct Answer
    A. White metal
    Explanation
    White metal is preferred for light loads bearing because it has excellent anti-friction properties and can withstand low pressure and speeds. It is a soft and ductile alloy made primarily of tin, lead, and antimony. The low melting point of white metal allows it to conform to the shape of the bearing surface, reducing friction and wear. Additionally, white metal has good lubricating properties and can withstand high temperatures without losing its load-carrying capacity.

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  • 49. 

    In a mechanical shaper the length of stroke is increased by

    • increasing the centre distance of bull gear and crank pin

    • Decreasing the centre distance of bull gear and crank pin

    • Increasing the length of arm

    • Decreasing the length of slot in the slotted lever

    Correct Answer
    A. increasing the centre distance of bull gear and crank pin
    Explanation
    Increasing the center distance of the bull gear and crank pin in a mechanical shaper will increase the length of stroke. This is because the center distance determines the distance between the axis of rotation of the bull gear and the axis of rotation of the crank pin. By increasing this distance, the crank pin will have a larger circular path, resulting in a longer stroke of the shaper.

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Quiz Review Timeline (Updated): Mar 22, 2023 +

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  • Current Version
  • Mar 22, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Oct 22, 2014
    Quiz Created by
    Royalmech
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