Electrical Machines Assessment Online Exam Quiz
Electrical Machines Assessment GK Quiz. Question and Answers related to Electrical Machines Assessment. MCQ (Multiple Choice Questions with answers about Electrical Machines Assessment
A single phase transformer has emf per turn having 2310/220 V, 50Hz transformer as 13 V. Then the estimated primary turns will be?
Options
A : 189 turns
B : 179 turns
C : 176 turns
D : 190 turns
A single phase transformer has emf per turn having 2310/220 V, 50Hz transformer as 13 V. The core area is(in square cm)?
Options
A : 393
B : 277.8
C : 358.92
D : 450.03
If a transformer is fed from a dc rather than a 1-phase ac supply, then the transformer will __________
Options
A : burn its windings
B : operate normal
C : will not operate
D : will give very small leakage flux
CRGO Laminations in a transformer are used to minimize __________
Options
A : eddy current loss
B : hysteresis loss
C : both eddy current and hysteresis loss
D : ohmic loss
There are two identical transformers A and B such that flux density applied to B is doubled. Then magnetizing current of B is?
Options
A : larger than A
B : double of A
C : half of A
D : same as that of A.
For a single phase transformer operating at normal operating conditions has useful flux of 1 Wb. If the machine is loaded at 0.8 p.f., then its mutual flux __________
Options
A : may decrease to 0.98 Wb
B : remains constant
C : may increase 1.02 Wb
D : may decrease to 0.8 Wb
If the frequency at the primary supply is varied gradually, then the secondary terminal voltage will __________
Options
A : not change
B : vary directly
C : will vary oppositely
D : will vary inverse of frequency
The flux involved in the emf equation of a transformer has __________
Options
A : rms value
B : average value
C : total value
D : maximum value
In a transformer ______ decreases with increase of the leakage flux.
Options
A : secondary terminal voltage
B : secondary induced voltage
C : primary induced voltage
D : all of the mentioned
In a transformer if the frequency of the supply is varied then the magnetizing current in the core also varies.
Options
A : True
B : False
C :
D :
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