Related Questions2 Items
Q1.NUMERICAL
The induced emf in a $3.3\text{ kV}$, $4$ pole, 3-phase star connected synchronous motor is considered to be equal and in phase with the terminal voltage under no load condition. On application of a mechanical load, the induced emf phasor is deflected by an angle of $2^\circ$ mechanical with respect to the terminal voltage phasor. If the synchronous reactance is $2\ \Omega$, and stator resistance is negligible, then the motor armature current magnitude, in ampere, during loaded condition is closest to \\\\\\\\\\\ (round off to two decimal places).
Q2.MCQ
A DC series motor with negligible series resistance is running at a certain speed driving a load, where the load torque varies as cube of the speed. The motor is fed from a $400\ \text{V}$ DC source and draws $40\ \text{A}$ armature current. Assume linear magnetic circuit. The external resistance, in $\Omega$, that must be connected in series with the armature to reduce the speed of the motor by half, is closest to
Electrical and Electronic EngineeringElectrical MachinesMultiple Choice (MCQ)1 Mark
Q2.
A DC series motor with negligible series resistance is running at a certain speed driving a load, where the load torque varies as cube of the speed. The motor is fed from a 400 V DC source and draws 40 A armature current. Assume linear magnetic circuit. The external resistance, in Ω, that must be connected in series with the armature to reduce the speed of the motor by half, is closest to
A
23.28 Ω
B
4.82 Ω
C
46.7 Ω
D
0 Ω