Electrical Machines Freshers Online Exam Quiz
Electrical Machines Freshers GK Quiz. Question and Answers related to Electrical Machines Freshers. MCQ (Multiple Choice Questions with answers about Electrical Machines Freshers
In the hopkinson’s test on two DC machines. Machine A has field current of 1.4A and B has field current of 1.3A. Which machine acts as motor?
Options
A : B
B : A
C : A, B
D : None of the mentioned
In the Hopkinson’s test on two DC machines. Machine A has field current of 1.4A and B has field current of 1.3A. Which machine acts as generator?
Options
A : B
B : A
C : A,B
D : None of the mentioned
Similarity between Hopkinonson’s and field’s test is that _______
Options
A : both need similar mechanically coupled motor
B : both need similar electrically coupled motor
C : regenerative power
D : negligible power
Swineburne’s test is applicable to those machines in which flux is practically _______
Options
A : constant
B : linear
C : non-linear
D : none of the mentioned
If the field current and armature current are reversed, then the __________
Options
A : direction of rotation remains same
B : direction of rotation reverses
C : stops
D : none of the mentioned
The quantities needed to complete retardation test are/is _________
Options
A : dw/dt and moment of inertia
B : dw/dt
C : current
D : any of the mentioned
Hopkinson’s test is also called regenerative test due to ____________
Options
A : energy of one machine is used to drive other
B : feedback
C : losses are least
D : extra motor is used
______ test is used for determining the efficiency of a traction motor.
Options
A : Field
B : Retardation
C : Hopkinson
D : Swineburne’s
What is the main concern before doing hopkinson’s test for finding efficiency?
Options
A : needs one motor and one generator is that it
B : ignores iron and stray losses
C : needs one motor
D : requires identical shunt machines
A dc motor is connected in the short-shunt configuration, but the series and the shunt windings get interchanged by mistake and the motor is connected to the rated voltage?
Options
A : neither of the windings get short-circuit
B : series winding gets overloaded
C : shunt winding gets overloaded
D : both of the winding get overloaded
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