10+ JK Cement Interview Questions and Answers

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.

• The speed difference is necessary to ensure proper valve ti...read more

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 include graphite, tungsten carbide, and certain types of plastic...read more

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 consumption.

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 used in CNC to control the movement, speed, and position ...read more

Stripping ratio is the amount of waste rock removed to extract one unit of ore. Workable range for an OCP is typically between 1:1 to 10:1.

• Stripping ratio is calculated by dividing the amount of waste rock by the amount of ore extracted.

• A lower stripping ratio indicates a more efficient mining operation.

• For an Open Cut Pit (OCP), the workable range for stripping ratio is usually between 1:1 to 10:1.

• For example, if a mine has a stripping ratio of 3:1, it means that for every 3...read more

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 applications where high starting torque and efficiency are...read more

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 built-up layer.

• Other types of chips include serrated chips, ...read more

The lack of high-rise buildings in India can be attributed to various factors such as land availability, building regulations, cultural preferences, and infrastructure limitations.

• Limited availability of land in urban areas restricts the construction of high-rise buildings.

• Building regulations and zoning laws often impose height restrictions and setback requirements.

• Cultural preferences in India often favor low-rise buildings that promote a sense of community and connection w...read more

Equipments used in an Open Cast Mine include excavators, dump trucks, bulldozers, drills, and draglines.

• Excavators are used for digging and removing overburden or ore.

• Dump trucks are used for transporting materials within the mine.

• Bulldozers are used for pushing and leveling the ground.

• Drills are used for drilling blast holes for explosives.

• Draglines are used for removing overburden in large quantities.

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 haul trucks, graders, and water trucks.

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.