Qz Drk || Dclick Epic Dice
Question 1
Maximum efficiency of a transformer is achieved when
Select one:
- Iron Losses = Copper Losses
- Iron Losses > Copper Losses
- Copper Losses> Iron Losses
- None of the above
Question 2
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Vector/phasor diagrams of voltages and currents at no load and load conditions give a better idea of what actually happens inside a transformer (True/False)
Select one:
True
False
Question 3
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Secondary voltage cannot be reduced or increased by changing the turns ratio between the primary and secondary winding (True/False)
Select one:
True
False
Question 4
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In a delta connection, line voltage and phase voltage are the same (True/False)
Select one:
True
False
Question 5
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Delta-delta connections are employed in large power rated transformers used in low voltage applications(True/False)
Select one:
True
False
Question 6
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Mark the incorrect statement: Characteristics of air blast circuit Breakers include:
Select one:
- High speed operation
- Short arcing times
- Does not allow current chopping
- Rapid auto reclosing
- Low maintenance of the breaker
Question 7
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Current chopping is used to describe the sudden reduction of current in a circuit breaker to zero at a time other than the natural instant of current zero (True/False)
Select one:
True
False
Question 8
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Improper battery sizing can lead to
Select one: - Low load voltage
- Permanent damage to battery cells
- Poor autonomy times
- All of the above
Question 9
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Which of these statements is true for ACBs?
Select one: - Used for circuits rated at less than 1000 V
- Can be installed in multi-tiers in LV switchboards or switchgear cabinets
- Maybe placed in draw-out enclosures that permit removal without dismantling the switchgear
- All of the above
Question 10
Vacuum and air circuit breakers are medium voltage switchgear types(True/False)
Select one:
True
False
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