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WorksheetsWhat you know about Transformers
Total questions: 15
Worksheet time: 8mins
Which of the following does not change in a Transformer ??
Current
Voltage
Frequency
All of these
In a Transformer the energy is conveyed from Primary to Secondary
Through the cooling coil
Through Air
By the Flux
None of the above
A transformer core is laminated to
Reduce hysteresis loss
Reduce eddy current losses
Reduce copper losses
All of these.
The no-load current drawn by transformer is usually what percent of the full load current ??
0.2 to 0.5 %
2 to 5 %
12 to 15 %
20 to 30 %
Which of the following is not a part of transformer installation.
Conservator
Breather
Buchholz relay
Exciter
A transformer transforms ?
Voltage
Current
Power
Frequency
A common method of cooling a power transformer is ??
Natural Air Cooling
Oil Cooling
Air Blast Cooling
All of these
Transformers breaths in when ??
Load on It Increases
Load on It decreases
Load remains constant
All of the above.
In a Transformer the tapping's are generally provided on
High Voltage side
Low Voltage side
Primary Side
Secondary Side
The Chemical used in Breather is
Asbestos Fiber.
Silica Sand.
Sodium Chloride.
Silica Gel
The Function of a Conservator in a Transformer is ??
To project against internal fault.
To reduce core loss and copper loss
To take care of the expansion and contraction of transformer oil due to the variation of temperature of surroundings.
To cool the transformer oil.
A transformer Oil must be Free from ?
Water
Sludge
Moisture
Ordor
Buchholz's relay gives warning and protection against
Electrical fault inside the transformer itself
Electrical fault outside the transformer in outgoing feeder
For both outside and inside faults.
Non of the above
Harmonics in Transformer result in
Increased Core Losses
Increased IR Losses
Magnetic interference with communication circuits
All of these
The Transformer Oil should have _____ Volatility and ______ Viscosity
High, High
Low , High
High , Low
Low , Low
