ONLINE MCQ EE-TRANSFORMER PART FIVE


[1] The degree of mechanical vibrations produced by the laminations of a transformers depends on
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
[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
[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
[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
[10] The noise resulting from vibrations of laminations set by magnetic force, is termed as
A. Magnetostriction
B. Boo
C. Hum
D. Zoom

Answer

ONLINE MCQ EE-TRANSFORMER PART SIX
ONLINE MCQ EE-TRANSFORMER PART FOUR

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