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
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
Transformer
Hot spot formation in Transformer
Causes of Hot spot formation in Transformer The winding is heated up by I2R losses, the core is heated up
Electrical Appliance
What is UPS, Types of UPS and selection of UPS and Battery bank
What is UPS and Full name of UPS? UPS-Uninterruptible Power Supply An uninterruptible power supply or uninterruptible power source (UPS)
Electrical Machine
Commutation in D.C. Motors
What is Commutation in DC Motor? Commutation is the process of reversal of current in the short circuited armature coil.
Electrical Machine
D.C. Motor: Working, Types, Application and their fault
What is D.C. motor? A machine that converts d.c. power into mechanical power is known as a D.C. motor. Its
Electrical Machine
Armature Reaction in D.C. Motors
Armature Reaction in D.C. Motors Armature reaction is expected because when current flows through the armature conductors of a d.c.
Interview
Interview question on DC Machine
Interview question on DC Machine Q: What are the essential parts of DC machine? Magnetic frame or yoke Poles Armature
Electrical Machine
Under Excitation Protection in Generators
Introduction Under Excitation Protection in Generators is a critical safeguard mechanism designed to prevent damage to synchronous generators (alternators) when
Electrical Machine
Motors used in domestic and industrial service
Domestic uses: Small universal motors of the series type are used in domestic appliances like vacuum cleaners, refrigerators, washing machine,
Electrical Machine
Rheostatic Braking of D. C. Series Motor
Rheostatic Braking of D. C. Series Motor Under normal running condition, the armature winding and series field winding are connected
Electrical Substation
Types of Bus Bar Protection and Why Bus Bar Protection required
Why Bus Bar Protection required? Busbars in the substation form important link between the incoming and outgoing circuits. If a
Electrical Substation
Types of Bus Bar Scheme in Electrical Substation
Introduction There are several ways in which the switching equipment can be connected in the electrical layout of substation. The
Case Studies
Lights Flickering in residential electrical system
Case Study This case study concerns Lights flickering in residential electrical system. The homeowners were experiencing lights flicker when loads
Electrical Substation
What is Voltage Stability and Voltage Instability in Power System
What is Voltage Stability? Voltage stability is concerned with the ability of a power system to maintain steady voltages at
Transformer
Transformer Oil Properties and Characteristic
What is Function of Transformer Oil? The purpose of use of transformer oil is dissipate heat by conduction through the
Electrical Machine
Direct Loading Test on Single Phase Transformer and Three Phase Induction Motor
Direct Loading Test on Single Phase Transformer The circuit diagram for the direct loading test is shown in the figure.
Transformer
Auto Transformer: Working Principle, Advantage, Application
What is Auto Transformer? A Transformer, in which a part of the winding is common to both the Primary and