Electrical Machines Three Phase Transformer Online Exam Quiz
Electrical Machines Three Phase Transformer GK Quiz. Question and Answers related to Electrical Machines Three Phase Transformer. MCQ (Multiple Choice Questions with answers about Electrical Machines Three Phase Transformer
For the given circuit below, the voltage across the terminal ‘a’ and ‘b’ is?
Options
A : 1.73*V
B : V/1.73
C : V
D : 3*V
The voltage across the terminal ‘r’ and ‘y’ is?
Options
A : 1.73*V
B : V/1.73
C : V
D : 3*V
A recording of the output of the emf induced for star and delta are recorded. Then shape of the emf induced in Y-connected 3-phase transformer is non sinusoidal in nature due to ___________
Options
A : 3rd harmonic component of currents is absent
B : 3rd harmonic component of currents is present
C : negative sequence component of current is present
D : none of the mentioned
If para magnetic core is used in the place of the ferromagnetic core of the transformer, then magnetostriction will ___________
Options
A : be vanished
B : reduce
C : increase
D : not be affected
When we magnetize the ferromagnetic core of the transformer, core length_______ and it ______ when demagnetized.
Options
A : decreases, increases
B : decreases, decreases
C : increases,increases
D : none of the mentioned
Open delta transformers can be obtained from ___________
Options
A : delta-delta
B : star-delta
C : delta-star
D : any of the mentioned
A V-V connected transformer can be connected in parallel to delta-delta connected transformer but not to ___________
Options
A : delta-star
B : star-delta
C : star-V
D : all of the mentioned
A 400 V, 10 KVA transformer at 50 Hz, is operated at the frequency of 40 Hz, then the humming ___________
Options
A : increases
B : decreases
C : remains same
D : increases to very high
Below is the circuit diagram for delta-delta transformer have a transformation ratio ‘k’. The current flowing in the windings of phase r-y in the below diagrams is?
Options
A : k*I/1.73
B : I/k*1.73
C : 1.73*k*I
D : 3*k*I
The delta-delta connections are used in applications of ___________
Options
A : large l.v. transformers
B : small h.v. transformers
C : large h.v. transformers
D : small l.v. transformers
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