A 50kVA, 550V single phase alternator draws a field current 10A at rated load. With the same field current, the open circuit emf and shirt circuit current are 300V and 150A. The ohmic resistance of the armature between terminals is 0.18Ω. The ratio of effective to ohmic resistance may be taken as 1.5. Determine the terminal voltage at 0.8 pf factor lagging. Use two decimal places.

Q: (b) Differentiate between single phase and three phase alternating current (A.C) supply for the…

A: Single Phase:Generated by a single rotating coil in a magnetic field.The coil cuts the magnetic…

Q: A 60 Hz, 33 kV, 3-phase alternator with earthed neutral has a reactance of 7 ohms per phase and is…

A: We have an alternator with earthed neutral which is connected to a bus-bar through a circuit breaker…

Q: A star connected Alternator excitation voltage and terminal voltages per phase respectively are 180V…

A: Alternator: It is used to convert the mechanical energy to electrical power in the form of…

Q: Indicate the equation that allows determining the voltage generated per phase, in a three-phase…

A: The explanation is as follows.

Q: Your company is to supply a 50 Hz alternator to a European company. The stator is wye connected with…

A: Given:- f=50 Hzϕ=0.173 weberT=28 turns

Q: A 60 Hz alternator stator is wye connected with each phase winding having 24 turns of wire. The…

A: f=60HzT=24 turnsϕ=0.103 weber

Synchronous Motor

The synchronous motor is an AC electric type motor where at a steady-state the shaft rotation is synchronized with the supply current variable-frequency. To an integral number of AC cycles, the rotation period is exactly equal. The stator of the motor in the synchronous motor contains multi-phase AC electromagnets due to which a magnetic field is created that rotates in time with the oscillation of the line current. The rotor contains a permanent magnet and the rotor rotates in synchronization with the stator field at the same rate and provides the second synchronized magnetic field which is rotating in nature as a result. When the synchronous motor is supplied with independently excited multi-phase AC electromagnets on both the rotor and the stator, it is termed as a doubly-fed machine. The most widely used AC-type motors are the synchronous AC motor and the induction AC motors.