Electrical Machines Power Angle Characteristics Synchronous Machines Online Exam Quiz
Electrical Machines Power Angle Characteristics Synchronous Machines GK Quiz. Question and Answers related to Electrical Machines Power Angle Characteristics Synchronous Machines. MCQ (Multiple Choice Questions with answers about Electrical Machines Power Angle Characteristics Synchronous Machines
A 3 phase 400V cylindrical rotor is running at 1500rpm. Suddenly the field excitation zero. Then the net reluctance power is?
Options
A : 0
B : sin 2d
C : cos d
D : cos 2d
A synchronous generator is running over excited with a Ef=1.40pu. This machine, with a synchronous reactance of 1.2pu, is delivering a synchronous power of 0.5pu to the bus. If the prime-mover torque is increased by 1%, by how much will the reactive power, Q change?
Options
A : -0.475 %
B : 0.475%
C : 4.75%
D : -4.75%
For a 3 phase 400V alternator supplying a load of 0.8 pf lagging at an armature current of 1.1pu. The power delivered to load is?
Options
A : 0.88pu
B : 0.8pu
C : 0.66pu
D : 1.375pu
A synchronous generator is operating with a Ef=1.40pu. This machine having Xs of 1.2pu, is delivering a synchronous power of 0.5pu to the bus. If the prime-mover torque is increased by 1%, by how much will the synchronous power P change?
Options
A : 1%
B : 10%
C : -1%
D : 4%
For a 3 phase 400V alternator having 0.5pu of synchronous reactance and its excitation voltage of 1.2pu and Vt of 1pu. Then the power delivered to the infinite bus is?
Options
A : 2.4pu
B : 4.8pu
C : 1.44pu
D : 1pu
Maximum power in cylinder rotor alternator occurs at load angle of __________
Options
A : 90 degree
B : 45 degree
C : less than 90 degree
D : 180 degree
In a synchronous machine, hunting is predominantly damped by __________
Options
A : mechanical losses in the rotor
B : iron losses in rotor
C : copper losses of stator
D : copper losses of rotor
The phasor addition of stator and rotor mmfs in a cylindrical rotor synchronous machine, is possible because __________
Options
A : mmfs are rotating in opposite direction
B : mmfs are rotating in same direction at different speeds
C : mmfs are stationary with respect to each other
D : one mmf is stationary and the other mmf is rotating
If the synchronous machine is connected to an infinite bus of constant voltage Vt, through a transformed, a transmission line of reactance ‘X’. Then power for a cylindrical machine is?
Options
A : P = (Ef*Vt sin?)/(Xs + X)
B : P = (Ef*Ef sin2?)/(Xs + X)
C : P = (Ef*Vt sin?)/(Xs – X)
D : P = (Vt*Vt sin?)/(Xs + X)
A synchronous machine which is synchronized with an infinite bus. If it is desired to obtain a condition when the machine delivers the real power to the IBB without changing the field excitation, then __________
Options
A : reactive power will be consumed by the machine
B : reactive power will be delivered by the machine
C : no reactive power flow will take place
D : none of the mentioned
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