Top 350+ Solved Electrical Machine 1 MCQ Questions Answer
Q. The use of higher flux density in the transformer design
a. reduces weight per kVA
b. reduces iron losses
c. reduces copper losses
d. increases part load efficiency
Q. 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 tr
Q. The chemical used in breather is
a. asbestos fibre
b. silica sand
c. sodium chloride
d. silica gel
Q. The noise resulting from vibrations of laminations set by magnetic forces, is termedas
a. magnetostrication
b. boo
c. hum
d. zoom
Q. Hysteresis loss in a transformer varies as CBmax = maximum flux density)
a. Bmax
b. Bmax1-6
c. Bmax1-83
d. B max
Q. Material used for construction of transformer core is usually
a. wood
b. copper
c. aluminium
d. silicon steel
Q. The thickness of laminations used in a transformer is usually
a. 0.4 mm to 0.5 mm
b. 4 mm to 5 mm
c. 14 mm to 15 mm
d. 25 mm to 40 mm
Q. The function of conservator in a transformer is
a. to project against'internal fault
b. to reduce copper as well as core losses
c. to cool the transformer oil
d. to take care of the exp
Q. The highest voltage for transmitting electrical power in India is
a. 33 kV.
b. 66 kV
c. 132 kV
d. 400 kV
Q. In a transformer the resistance between its primary and secondary is
a. zero
b. 1 ohm
c. 1000 ohms
d. infinite
Q. A Buchholz relay can be installed on
a. auto-transformers
b. air-cooled transformers
c. welding transformers
d. oil cooled tr
Q. Gas is usually not liberated due to dissociation of transformer oil unless the oiltemperature exceeds
a. 50°C
b. 80°C
c. 100°C
d. 150°C
Q. The main reason for generation of harmonics in a transformer could be
a. fluctuating load
b. poor insulation
c. mechanical vibrations
d. saturation of core