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Department of Mechanical Engineering
ET and E
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Question 1 : Power transformer from primary to secondary depends upon
Option-1 :number of primary turns.
Option-2 :number of secondary turns.
Option-3 :current transformation ratio.
Option-4 :magnetic coupling between primary and secondary windings.
Question 2 : A transformer a supplying pure resistive (unity pf) load. The power factor on primary side will be
Option-1 :about 0.95 (lead).
Option-2 :about 0.95 (lag).
Option-3 :zero.
Option-4 :unity.
Question 3 : The phase relation between secondary current and secondary terminal voltage depends upon
Option-1 :primary winding impedance.
Option-2 :secondary winding impedance.
Option-3 :load impedance.
Option-4 :none of the above.
Question 4 : In a transformer supplying inductive load
Option-1 :the secondary current results in equivalent primary current in phase opposition.
Option-2 :the secondary terminal voltage is less than the secondary induced emf.
Option-3 :the power factor on primary side will be lower than that of load.
Option-4 :all of the above.
Question 5 : The phasor diagram of a transformer on load can be drawn only if we know.
Option-1 :equivalent circuit parameters of the transformer.
Option-2 :load current,
Option-3 :load p.f.
Option-4 :all of the above.
Question 6 : The winding used in a 3 phase shell type transformer is __________ type
Option-1 :circular.
Option-2 :cylinderical.
Option-3 :sandmich.
Option-4 :rectangular.
Question 7 : The inductive reactance of a transformer depends on
Option-1 :electomotive force.
Option-2 :magnetomotive force.
Option-3 :magnetic flux.
Option-4 :leakage flux.
Question 8 : The inductive reactance of a transformer depends upon
Option-1 :leakage flux.
Option-2 :size of core.
Option-3 :both (a) and (b).
Option-4 :none of these.
Question 9 : The magnetizing current, for sinusoidal applied voltage will be
Option-1 :always non-sinusoidal.
Option-2 :always sinusoidal.
Option-3 :sinusoidal or non-sinusoidal depending upon the saturation point.
Option-4 :none of the above.
Question 10 : The emf induced in the primary
Option-1 :is in phase with flux.
Option-2 :lags behind the flux by 90 degree.
Option-3 :leads the flux by 90 degree.
Option-4 :is in phase opposition to that of flux.
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