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 primary and secondary windings of a power transformer always have
• The iron core in a transformer provides a _____path to the main flux
• A transformer transforms
• For an ideal transformer, the windings should have
• The core flux in transformer depends mainly on
• If the supply frequency of a transformer is increased, keeping the supply voltage constant, then
• The power factor of a transformer on no load poor due to
• The core flux of a practical transformer with a resistance load
• The inductive reactance of a transformer depends on
• The flux in transformer core
• The mutual flux in a loaded transformer can be varied by varying
• The primary ampere turns are counter balanced by
• In a transformer_____ decreases with the increase in leakage flux
• Power transformed from primary to secondary depends upon
• In a transformer, zero voltage regulation at full load is
• Positive voltage regulation of a transformer is an indication of ____load
• The main purpose of performing open circuit on a transformer is to measure its 
• Open circuit test in a transformer is performed with
• The open circuit test on a transformer gives
• During short-circuit test of a transformer, core losses are negligible because
• The efficiency of a power transformer can be determined indirectly by
• The transformer efficiency at relatively light loads is quite low. This is due to
• The transformer efficiency, under heavy loads is comparatively low because
• The efficiency of a transformer will be maximum when
• Power transformers are designed to have maximum efficiency at 
• The transformer efficiency will be maximum at a power factor of
• The all-day efficiency of a distribution transformer will be high with low
• The all-day efficiency of a transformer depends primarily on
• The desirable properties of transformer core material are
• The use of higher flux density in the transformer design
• The size of the transformer core depends upon
• Silicon content in iron laminations is kept within 5% as it
• Transformer core laminations are coated with an enamel layer in order to
• 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
• The core and windings of a transformer are put in a steel tank in order to 
• Sludge formation in transformer oil is due to which one of the following?
• In a power transformer, the breather is provided in order to 
• The chemical used in breather of a transformer should have quality of
• Malfunctioning of the Buchholz relay may be caused due to 
• A Buchholz relay is used for 
• A shell type transformer is commonly used as it has 
• A distribution transformer is selected on the basis of 
• Natural air cooling is used for transformer of rating up to 
• Which type of winding is used in 3-phase shell-type transformer?
• Scott connections are used for
• In Scott connections, the teaser transformer operates on 0.866 of its rated
• The tertiary winding is used In which transformer?
• The magnetizing current in a transformer is rich in
• Two transformers operating in parallel will share the load depending upon their 
• Power is transferred In an auto transformer through 
• High leakage reactance transformers are of 
• The output voltage can be varied by a variac transformer over a 
• The excessive temperature rise will cause maximum damage to