Related MCQ Question

• The efficiency of a power transformer is around
• In a transformer, electrical power is transferred from primary to secondary
• The two windings of a transformer are
• Transformer action requires a
• The flux created by the current flowing through the primary winding induces emf in
• The power factor of a transformer on no load poor due to
• The mutual flux in a loaded transformer can be varied by varying
• The primary ampere turns are counter balanced by
• The main purpose of performing open circuit on a transformer is to measure its 
• The open circuit test on a transformer gives
• The transformer efficiency will be maximum at a power factor of
• Silicon content in iron laminations is kept within 5% as it
• The primary and secondary windings are interlaced for
• Major insulation in a transformer is the insulation between the
• Minor insulation in a transformer is the insulation between the
• The function of oil in a transformer is 
• The color of fresh dielectric oil used in transformers is
• Transformer oil must be free from
• Sludge formation in transformer oil is due to which one of the following?
• In a power transformer, the breather is provided in order to 
• A Buchholz relay is used for 
• A distribution transformer is selected on the basis of 
• Which type of winding is used in 3-phase shell-type transformer?
• Scott connections are used for
• The magnetizing current in a transformer is rich in
• Power is transferred In an auto transformer through