Trouble Shooting chart of D.C. Machines
Trouble Shooting chart of D.C. Machines Common defects in commutators A good commutator will have a smooth polished surface dark […]
Electrical Machine
Electrical Machine
Centrifugal Pump troubleshooting
Centrifugal Pump troubleshooting (1) Failure to start : Gland packing may be too tight. Check whether spindle is freely rotating.
Electrical Machine
Maintenance schedule of Electrical Machines in Industries
Types of Maintenance Breakdown maintenance Breakdown maintenance is basically the “run it till it breaks” type of maintenance mode. No
Electrical Appliance
Electrical Circuit of Refrigerator and Common fault
Electrical Circuit of Refrigerator Function of parts Lamp and Switch The lamp and switch components function in the refrigerator to
Basic Electrical
Hysteresis loop for ferromagnetic material
Magnetic Hysteresis Loop The Magnetic Hysteresis loop above shows the behavior of a ferromagnetic core graphically as the relationship between
Transformer
Transformer Turns Ratio Test (TTR)
What is Transformer Turns Ratio Test? The turns ratio test is an AC low voltage test which determines the ratio
Electrical Substation
GIS Substation Maintenance and Verification schedule
Maintenance schedule of GIS substation Generally GIS requires no or very little maintenance and monitoring the SF6 gas pressure and
Trending
What is Smart Meter and their Block diagram
Define Smart Meter A smart meter is an electronic device that records consumption of electric energy and communicates the information
Trending
Micro Grid: Need, Component, Operation and difference
Define Micro Grid A micro grid is a small-scale power grid that can operate independently or collaboratively with other small
Basic Electrical
What are the general rules for residential wiring work
General Rules for residential wiring All electrics supply lines and apparatus shall be of sufficient in mechanical strength and size
Transformer
Transformer Oil Testing
Regular sampling and testing of insulation oil taken from the transformer is a valuable technique in the preventative maintenance program.
Renewable Energy
Solar PV plant Monitor and performance issues
Solar PV monitor Monitoring is very common with Solar PV systems. Often residential monitoring consists of a device that measures
Basic Electrical
Define Volts and Power and Calculation formula
Volts Current x Resistance = Volts I x R = V Voltage is equal to current multiplied by resistance. This
Basic Electrical
Define Short circuit and when does electric short circuit occurs
Define short circuit A short circuit is an abnormal connection of very low impedance between two points of different potential,
Trending
Solid State Transformer (SST)
What is Solid State Transformer? Solid state transformer has been put as one of the emerging technologies in power electronics.
Transmission Line
How to locate Cable fault
Cable fault locate technique Without cable fault indicators the utility must rely on more manual techniques for finding the location
Electrical Appliance
Nickel Cadmium (NiCd) Battery: Application, Advantages and Disadvantages
What is Nickel–Cadmium (NiCd) Battery? The nickel cadmium battery (Ni–Cd battery) (commonly abbreviated NiCd or NiCad) is a type of
Electrical Appliance
What is Nickel iron battery
What is Nickel iron battery ? The nickel–iron battery (NiFe battery) is a storage battery having a nickel(III) oxide-hydroxide cathode
Basic Electrical
What is Electrolysis and Industrial application
Define Electrolysis Electrolysis is the passage of a direct electric current through an ionic substance that is either molten or
Electrical Appliance
What is Drop Out (swing out) Fuse
Working of Drop out Fuse When an overcurrent or short-circuit situation occurs, the fuse element within the device melts, disconnecting
Electrical Substation
Fire -fighting equipment used in Electrical Substation
Fire Buckets A Fire Bucket is filled with sand or water and is used to extinguish fires. Sand is often
MCQ (Objective)
Objective (MCQ) on Wiring tools, safety components and cables
1. ELCB gives protection against (A) Shock (B) Overload (C) Short Circuits (D) All of the above Answer: – Option
MCQ (Objective)
Objective (MCQ) on Thermal Power Plant
The boiler commonly used in a thermal plant are__________________. a) Water tube type b) Fire tube c) Both (a) &
MCQ (Objective)
Objective (MCQ) on Synchronous Motor
Synchronous motors are generally not self-starting because (a) the direction of rotation is not fixed (b) the direction of instantaneous
MCQ (Objective)
Objective (MCQ) on Induction Motor
Which of the following component is usually fabricated out of silicon steel ? (a) Bearings (b) Shaft (c) Stator core
MCQ (Objective)
Objective (MCQ) on Earthing System
The ground wire is coloured Green Black Yellow Red Answer: – Option 1 The maximum permissible value of earth resistance
MCQ (Objective)
Objective (MCQ) on Battery and Cell
“The mass of an ion liberated at an electrode is directly proportional to the quantity of electricity”. The above statement
MCQ (Objective)
Objective (MCQ) question on single phase Induction Motor
In a split phase motor, the running winding should have (a) high resistance and low inductance (b) low resistance and
MCQ (Objective)
Objective (MCQ) question on DC Motors
No-load speed of which of the following motor will be highest ? (a) Shunt motor (b) Series motor (c) Cumulative
Electrical Substation
Accessories used in Electrical Substation
Accessories used in Electrical Substation Power transformers: These are essential for stepping down the secondary transmission level voltage to primary