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I applied via Company Website and was interviewed in Dec 2020. There was 1 interview round.
I applied via Walk-in and was interviewed before May 2020. There were 6 interview rounds.
Estimating wiring and connections in a building involves assessing the electrical needs and layout of the space.
Assess the electrical needs of the building, including the number of outlets, lighting fixtures, and appliances.
Determine the layout of the building and the best routes for wiring to avoid hazards and maximize efficiency.
Consider the type of wiring needed, such as copper or aluminum, and the appropriate gauge...
Cables that transfer power are of different types depending on the application.
AC power cables
DC power cables
Coaxial cables
Ethernet cables
USB cables
HDMI cables
Optical fiber cables
Single phase motors are commonly used in household appliances and small machinery.
Split-phase motor
Capacitor-start motor
Capacitor-run motor
Shaded-pole motor
Distribution transformer rating is the maximum power it can handle without overheating.
Distribution transformer rating is expressed in kVA (kilovolt-ampere).
It is important to choose the right rating for the transformer based on the load requirements.
The rating of a transformer can be determined by calculating the load requirements of the system it is being installed in.
For example, if the load requirement is 500 kVA, ...
I applied via Indeed and was interviewed in Oct 2020. There were 4 interview rounds.
I applied via employment news and was interviewed before Feb 2021. There was 1 interview round.
Coal India interview questions for popular designations
I applied via Campus Placement and was interviewed before Apr 2020. There were 3 interview rounds.
Safety devices of Direct Haulage include emergency stop buttons, warning signals, and safety barriers.
Emergency stop buttons are installed at regular intervals along the haulage route.
Warning signals such as flashing lights and alarms are used to alert workers of approaching haulage equipment.
Safety barriers are used to prevent workers from entering hazardous areas.
Proximity detection systems are used to detect the pre...
The calorific value of coal varies depending on the type of coal, but typically ranges from 24 to 30 megajoules per kilogram.
Calorific value is the amount of heat released when a substance is burned.
It is measured in units of energy per unit of mass, such as joules per gram or megajoules per kilogram.
The calorific value of coal can vary depending on factors such as moisture content, ash content, and sulfur content.
For ...
Portable machines can be easily carried around, while transportable machines require disassembly and reassembly for transportation.
Portable machines are designed to be easily moved from one location to another without much effort.
Transportable machines require disassembly and reassembly for transportation.
Portable machines are usually smaller and lighter than transportable machines.
Examples of portable machines include...
Get interview-ready with Top Coal India Interview Questions
I applied via Newspaper Ad and was interviewed before May 2021. There was 1 interview round.
I applied via Walk-in and was interviewed before Oct 2019. There were 4 interview rounds.
To find the steel weight, you need to know the dimensions and density of the steel.
Determine the dimensions of the steel (length, width, and height)
Find the density of the specific type of steel being used
Multiply the volume of the steel by its density to calculate the weight
Weight (in kg) = Volume (in m^3) x Density (in kg/m^3)
There are 100 centimetres in one metre.
One metre is equal to 100 centimetres.
To convert metres to centimetres, multiply by 100.
To convert centimetres to metres, divide by 100.
I applied via Walk-in and was interviewed before Apr 2020. There was 1 interview round.
A transformer is an electrical device that transfers electrical energy from one circuit to another through electromagnetic induction.
Transformers are used to increase or decrease the voltage of an alternating current (AC) power supply.
They consist of two coils of wire, known as the primary and secondary coils, which are wrapped around a magnetic core.
When an AC voltage is applied to the primary coil, it creates a magne...
The type of breaker used depends on the electrical load and the circuit requirements.
The most common types of breakers are standard, AFCI, GFCI, and dual-function.
Standard breakers are used for general-purpose circuits.
AFCI breakers are used for circuits that power bedrooms and living rooms.
GFCI breakers are used for circuits that power bathrooms, kitchens, and outdoor areas.
Dual-function breakers combine AFCI and GFCI...
Conductors are materials that allow electricity to flow through them. There are different types of conductors used in electrical systems.
Copper is the most commonly used conductor in electrical wiring
Aluminum is also used as a conductor, especially in high voltage power transmission
Silver is the best conductor, but it is too expensive for most applications
Gold is also a good conductor, but it is even more expensive tha...
MCB is a miniature circuit breaker while MCCB is a molded case circuit breaker.
MCB is used for low current applications while MCCB is used for high current applications.
MCB is rated up to 100 amps while MCCB can be rated up to 2500 amps.
MCCB has adjustable trip settings while MCB does not.
MCCB is more expensive than MCB.
Examples of MCB brands include Legrand and Schneider while examples of MCCB brands include Siemens a
I applied via Employment News and was interviewed before Dec 2018. There were 8 interview rounds.
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...
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Assistant Manager
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Assistant Manager Finance
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