TRANSFORMER PART 5
Category –EE Online Test
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Attempt Free TRANSFORMER PART 5 Here. Read The Important Electrical MCQ From Below.
A. Tightness of clamping
B. Gauge of laminations
C. Size of laminations
D. All of the above
Answer
[2] The no-load current drawn by transformer is usually……..percent of the full-load current?
A. 0.2 to 0.5 %
B. 2 to 5%
C. 12 to 15 %
D. 20 to 30 %
Answer
TRANSFORMER PART 5
[3] The dielectric strength of transformer oil is expected to be
A. 1kV
B. 33kV
C. 100kV
D. 330 kV
Answer
[4] During the short-circuit test on a small transformer the frequency is increased from 50-200Hz. The copper losses will increase by a factor of
A. 16
B. 4
C. 1
D. 1/4
Answer
TRANSFORMER PART 5
[5] No-load current in a transformer
A. Lags behind the voltage by about 75 deg
B. Leads the voltage by about 75
C. Lags behind the voltage by about 15
D. Leads the voltage by about 15
Answer
[6] While conducting short-circuit test on a transformer the following side is short circuited
A. High voltage side
B. Low voltage side
C. Primary side
D. Secondary side
Answer
[7] The chemical used in breather for transformer should have the quality of
A. Ionizing air
B. Absorbing moisture
C. Cleansing the transformer oil
D. Cooling the transformer oil
Answer
TRANSFORMER PART 5
[8] If a pump motor is run on 2/3rd of its supply voltage, it will
A. Continue to deliver same power
B. Burn
C. Stall
D. Continue to run at lower speed
Answer
[9] An ideal transformer has infinite values of primary and secondary inductances. The statement is
A. True
B. False
Answer
TRANSFORMER PART 5
[10] The noise resulting from vibrations of laminations set by magnetic force, is termed as
A. Magnetostriction
B. Boo
C. Hum
D. Zoom
Answer
