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No load test is performed when rotor rotates with synchronous speed and there is no load torque. This test is similar to the open circuit test on transformer.
Actually, to achieve synchronous speed in an induction motor is impossible. The speed is assumed to be synchronized. The synchronous speed can be achieved by taking slip = 0 which creates infinite impedance in the rotor branch.
During the no load test the energy consumed will be used to meet the core losses and the friction and windage losses.
Rotor copper loss at no load is very less that its value is negligible.
The diagram shows how the energy supplied to the motor is utilized and different losses in the motor.
Power input = core loss ?? copper loss windage and friction loss
Core loss occur only in stator, because at no load slip is very small , so frequency of induced emf in rotor will be extremely small.

For the star-delta starter connection 6 terminals are required. They have to be rearranged between them to get star or delta connection as shown in the diagram below. Neutral wire is not necessary for the connection.

The engine requires a rich mixture (more fuel than a stoichiometric mixture) for starting at idling to compensate for the charge dilution due to exhaust gases from the combustion chamber.
Exhaust gas dilution prevents efficient combustion by reducing the contact between the fuel and air particles.

The passageway in the parting plane through which molten flow is regulated is known as sprue. It may be used to control the flow of metal in mould cavity.

The passageway in the parting plane through which molten flow is regulated is known as a runner. Here the flow is regulated.

Only robots are associated with automation.
A robot is a machine,especially one programmable by a computer,capable of carrying out a complex series of actions automatically.

KOH Solution will absorb CO2

In explosion welding process pressure is applied by detonating a layer of explosive. It is a non conventional process of welding.

In thermit welding, the heat generated is due to the mixing of Aluminum and iron oxide. It is a conventional process of welding.

Electron beam welding is carried out in a vacuum. It is a non conventional process of welding.

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