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The camshaft and crankshaft have different speeds in an engine.
The camshaft controls the opening and closing of the engine's valves, while the crankshaft converts the reciprocating motion of the pistons into rotational motion.
The camshaft rotates at half the speed of the crankshaft in a four-stroke engine.
For example, if the crankshaft rotates at 6000 revolutions per minute (RPM), the camshaft will rotate at 3000 RPM.
T...
CNC stands for Computer Numerical Control. It is a manufacturing process that uses pre-programmed computer software to control machine tools.
CNC is a manufacturing process that automates the operation of machine tools.
It uses computer software to control the movement and operation of the machines.
CNC machines are widely used in industries such as automotive, aerospace, and electronics.
G codes are a programming language...
Different types of chips in metal cutting include continuous chips, discontinuous chips, and built-up edge chips.
Continuous chips are formed when the cutting tool continuously removes material from the workpiece.
Discontinuous chips are formed when the cutting tool intermittently removes material, resulting in segmented chips.
Built-up edge chips occur when the material being cut adheres to the cutting tool, forming a bu...
Discontinuous chips are formed in certain materials during machining processes.
Discontinuous chips are formed in brittle materials like cast iron, ceramics, and glass.
These materials have low ductility and tend to fracture during machining.
The discontinuous chips have a segmented or broken appearance.
They are characterized by irregular shapes and rough surfaces.
Examples of materials that form discontinuous chips includ...
Copper loss in a transformer decreases when it operates at half its rated MVA.
Copper loss is directly proportional to the square of the current flowing through the windings.
When the transformer operates at half its rated MVA, the current flowing through the windings is reduced.
As a result, the copper loss in the transformer decreases.
This reduction in copper loss leads to improved efficiency and lower energy consumptio
A wound rotor induction motor can provide high starting torque and high efficiency.
Wound rotor induction motors have a higher starting torque compared to squirrel cage induction motors.
The rotor windings in a wound rotor motor can be connected to external resistors, allowing for higher torque during startup.
By adjusting the resistance in the rotor circuit, the motor can achieve high efficiency at full load.
Examples of ...
Coal India interview questions for popular designations
I am a highly motivated individual with a passion for learning and growth.
I have a Bachelor's degree in Business Administration
I have completed several internships in the field of marketing and sales
I am a quick learner and enjoy taking on new challenges
I am a team player and enjoy collaborating with others to achieve common goals
A haul road is a road used for transporting materials, typically in a mining or construction site.
Haul roads are designed to handle heavy loads and are often unpaved.
They are used to transport materials such as ore, rock, and dirt.
Haul roads must be maintained regularly to ensure safety and efficiency.
Proper drainage is important to prevent erosion and maintain road stability.
Examples of haul road equipment include hau
A flame safety lamp is a type of lamp used in mining to detect methane gas and prevent explosions.
It works by creating a flame inside a mesh screen that will go out if methane is present.
The lamp was invented by Sir Humphry Davy in 1815.
It was widely used in coal mines in the 19th and early 20th centuries.
Today, electronic gas detectors have largely replaced flame safety lamps in mining.
Get interview-ready with Top Coal India Interview Questions
I am impressed with the company's commitment to innovation and employee development.
The company has a reputation for investing in its employees through training and development programs.
I am excited about the company's focus on innovation and staying ahead of industry trends.
The company's mission and values align with my own personal and professional goals.
I have researched the company and have been impressed with its ...
I applied via Other and was interviewed before Jul 2017. There were 3 interview rounds.
Sharp corners are avoided in casting to prevent stress concentration and improve the overall strength and quality of the casting.
Sharp corners can lead to stress concentration, which can cause cracks or failure in the casting.
Rounded corners distribute stress more evenly, reducing the likelihood of defects.
Sharp corners can also create difficulties during the casting process, such as mold filling and solidification iss...
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