What is Air Receiver? Working, Diagram, Construction & Function
An Air receiver is a pressure vessel used to store compressed air supplied by the compressor. The reciprocating compressors and […]
Hydraulics & Pneumatics
Hydraulics & Pneumatics
What is Pressure Relief Valve? Working Principle, Symbol, Diagram, Types & Function
When pressure control valve is used to limit the pressure in a system to a prescribed maximum value by draining
Electrical Machines
What is Single Phasing Preventer? Explanation & Circuit Diagram
Single phasing means, one of the three phases is disconnected from the 3-phase supply so that the motor’s two phases
Measurements & Instrumentation
What is Photoconductive Cell? Working, Symbol, Characteristics & Applications
In certain semiconductor materials, when light falls on them, their electrical resistance varies. If constant voltage is applied to such
Electrical Machines
Blocked Rotor Test of Induction Motor
This Block rotor test of Induction motor test is analogues to the short circuit test on transformer. This test gives
Power System
What is Transformer Protection? Theory, Protection Relays & Types
The transformer is heart of power system. Power transformer is a major equipment in power system. It requires highly reliable protective
Power System
What is Earthing Switch? Working, Symbol, Installation & Function
Earthing Switch is connected between the line conductor and the earth. Normally, it is open when isolation work of opening
Power System
What is Reactance Relay? Theory, Diagram, Torque Equation & Characteristics
Reactance relay is over current relay with directional restraint. The current polarizing flux goes from upper polarizing coil magnet to lower electromagnet through
Power System
What is MHO Relay? Theory, Diagram, Torque Equation & Characteristics
The impedance relay is not normally used because of need of a separate directional unit. So mho type relays are
Power Electronics
Class A Commutation of Thyristor (SCR) | Current Commutation of Thyristor (SCR)
Load in Parallel with the SCR The class A commutation is also called as self commutation. Fig. 1 shows the