Electrical Machines Measurement Xd Xq Online Exam Quiz
Electrical Machines Measurement Xd Xq GK Quiz. Question and Answers related to Electrical Machines Measurement Xd Xq. MCQ (Multiple Choice Questions with answers about Electrical Machines Measurement Xd Xq
A synchronous motor is operated at a bus voltage of 1.5 pu and drawing 1.0 pu at zpf leading current. Its synchronous reactance is 0.4 pu. What is the excitation emf of the motor?
Options
A : 2.0 pu
B : 1.5 pu
C : 1.0 pu
D : 1.1 pu
If the excitation of a 3-phase alternator operating on infinite bus bars is changed, which one of the following will get affected?
Options
A : Active real power of machine
B : Reactive power of machine
C : Terminal voltage of machine
D : Frequency of machine
Slip test must be conducted at low armature terminal voltage. This is due to ____________
Options
A : avoiding error due to large slip
B : avoiding error due to small slip
C : avoiding heating
D : all of the mentioned
An alternator with higher value of SCR has ____________
Options
A : better voltage regulation and higher stability limit
B : poor voltage regulation and lower stability limit
C : poor voltage regulation and higher stability limit
D : better voltage regulation and lower stability limit
Slip test is performed to obtain _____________
Options
A : direct axis reactance and quadrature axis reactance
B : slip
C : positive and negative sequence reactance
D : sub transient reactance
A 3 Phase 400, 100 MVA alternator is connected to infinite bus bar. If the mechanical power input is more than the maximum reluctance power, the reluctance generator will lose synchronizm if ____________
Options
A : field is open circuited
B : field is short-circuited
C : load is removed
D : damper is removed
If a cylindrical rotor synchronous generator, is connected to the IBB, if the field is made zero, then it behaves as ____________
Options
A : induction generator for a short time
B : induction motor
C : synchronous motor
D : synchronous generator
Which of the options given will have no effect on the working of the synchronous motor if ignored?
Options
A : It has comparable reactance
B : It requires dc excitation
C : It can not be started under no load
D : It has tendency to hunt
A stationary alternator is connected to the infinite bus. It should not be connected because ____________
Options
A : it will get short circuited
B : it will operate as induction motor
C : it will reduce bus bar voltage
D : all of the mentioned
When synchronous motor is running at synchronous speed, the damper winding produces?
Options
A : no torque
B : eddy current torque
C : damping torque
D : torque aiding the developed torque
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