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JE 2019 || Day 16 || Transformers Quiz 1
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Question 1
For the ideal transformer shown in below figure,
Question 2
The input current to a 3-phase step down transformer connected to an 
supply system is 
Calculate the secondary line voltage for star-star connection if the phase turns ratio is 44.
supply system is Calculate the secondary line voltage for star-star connection if the phase turns ratio is 44.Question 3
A 3-phase, 50 Hz transformer has a delta-connected primary and star connected secondary; the line voltages being 22000 V and 400 V respectively. The secondary has a star connected balanced load at 0.8 power factor lagging. The line current on the primary side is 5 A. What is the secondary phase current?
Question 4
A 
transformer has a primary resistance of 
and secondary resistance of 
Its iron loss at normal input is 
The secondary current at which maximum efficiency will occur is
transformer has a primary resistance of and secondary resistance of Its iron loss at normal input is The secondary current at which maximum efficiency will occur is Question 5
A 40 kVA transformer has iron loss of 450 W and full-load copper loss of 850 W. If the power factor of the load is 0.8 lagging, the full-load efficiency of the transformer is
Question 6
The low voltage winding of a 
transformer has 190 turns and a resistance of 
The high voltage side has 910 turns and a resistance of 
When low voltage winding is short-circuited, the full-load current is obtained with 
applied to h.b. side. What is the equivalent leakage reactance referred to high-voltage side? Assume full-load efficiency of 98.5%.
transformer has 190 turns and a resistance of The high voltage side has 910 turns and a resistance of When low voltage winding is short-circuited, the full-load current is obtained with applied to h.b. side. What is the equivalent leakage reactance referred to high-voltage side? Assume full-load efficiency of 98.5%. Question 7
The low voltage winding of a 
transformer has 190 turns and a resistance of 
The high voltage side has 910 turns and a resistance of 
When low voltage winding is short-circuited, the full-load current is obtained with 
applied to h.b. side. What is the equivalent resistance referred to high voltage side?
transformer has 190 turns and a resistance of The high voltage side has 910 turns and a resistance of When low voltage winding is short-circuited, the full-load current is obtained with applied to h.b. side. What is the equivalent resistance referred to high voltage side? Question 8
A single phase 
transformer has a full-load secondary current of 500 A ; the primary current being one-fifth of this value. The transformer has the following parameters :
Neglect no-load current. The secondary is short-circuited. What is the power factor on short-circuit?
transformer has a full-load secondary current of 500 A ; the primary current being one-fifth of this value. The transformer has the following parameters : Neglect no-load current. The secondary is short-circuited. What is the power factor on short-circuit?
Question 9
A 
transformer has primary values 
and secondary values 
and 
The equivalent impedance of the transformer referred to the primary side is
transformer has primary values and secondary values and The equivalent impedance of the transformer referred to the primary side is Question 10
A single phase transformer with a ratio of 
has a load impedance of 
connected across the terminals of low voltage winding. Neglecting losses in the transformer, what is the full-load primary current?
has a load impedance of connected across the terminals of low voltage winding. Neglecting losses in the transformer, what is the full-load primary current? - 446 attempts
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ESE & GATE EEGeneralFeb 7ESE & GATE EE
