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RRB/SSC JE Electrical 2019 || Weekly Revision Quiz
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Question 1
When load on a transformer is decreased, ………………..loss is decreased.
Question 2
The temperature rise of a transformer is directly proportional to………………………..
Question 3
The impedance reflected back to the source in Fig. is………………..
Question 4
The secondary load impedance of a step-up transformer is 
The primary impedance 
will be
The primary impedance will be Question 5
A single phase transformer with a ratio of 
has a load impedance of 
connected across the terminals of low voltage winding. The power delivered to the load is
has a load impedance of connected across the terminals of low voltage winding. The power delivered to the load is Question 6
A 
single-phase transformer has a primary resistance and inductive reactance of 
and 
respectively. The secondary values are 
and 
respectively. What is the impedance of the transformer referred to the secondary side?
single-phase transformer has a primary resistance and inductive reactance of and respectively. The secondary values are and respectively. What is the impedance of the transformer referred to the secondary side? Question 7
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 8
A 
transformer has full-load Cu loss of 
and iron loss of 
It will have a maximum efficiency for a load of
transformer has full-load Cu loss of and iron loss of It will have a maximum efficiency for a load of Question 9
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 10
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? - 1267 attempts
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