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For the following questions answer them individually
The brush contact losses in a d.c. machine is
Inversely proportional to the square of current
Directly proportional to the square of current
Inversely proportional to the current
Directly proportional to the current
In which transformer, the tertiary winding is used
Star - delta
Star - star
Delta - delta
Delta - star
Secondary winding of an auto transformer is also called_____.
compensating winding
common winding
tertiary winding
damping winding
The maximum allowable voltage between adjacent segment is
10-20V
20-30V
40-50V
30-40V
The field control of a DC shunt motor gives_____.
constant torque drive
constant kW drive
constant speed drive
variable load speed drive
The no load current in a transformer is
Sinusoidal
nonSinusoidal
Trapezoidal
stepped
Transformer cooling and insulation oil must be of
low viscosity
high viscosity
low BDV
low resistivity
Single Phase transformers can be used in parallel only when their voltages are
Equal
UnEqual
Zero
None of these
When the phase sequence of supply currents are reversed, then the direction of rotation of the resultant magnetic field wave
not unchanged
to and fro
reversed
The availability of full -rated torque at starting is obtained from induction motor is
rotor resistance control
stator voltage control
slip ring control
line current control
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