In case of D.C. machines, mechanical losses are primary function of

Related MCQs

• Losses which occur in rotating electric machines and do not occur in transformers are
• In D.C. machines fractional pitch winding is used
• In D.C. machines the residual magnetism is of the order of
• The purpose of retardation test on D.C. shunt machines is to find out
• Hopkinson's test on D.C. machines is conducted at
• Satisfactory commutation of D.C. machines requires
• Brushes of D.C. machines are made of
• For a D.C. machines laboratory following type of D.C. supply will be suitable
• The degree of mechanical vibrations produced by the laminations of a transformer depends on
• The mechanical power developed by a shunt motor will be maximum when theratio of back e.m.f. to applied voltage is