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SSC JE ELECTRICAL
ssc MCQs with answers - Part 6
1. 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 Answer: Directly proportional to the current 2. In which transformer, the tertiary winding is used ? Star - delta Star - star Delta - delta Delta - star Answer: Star - star 3. Secondary winding of an auto transformer is also called ? compensating winding common winding tertiary winding damping winding Answer: common winding 4. The maximum allowable voltage between adjacent segment is ? 10-20V 20-30V 40-50V 30-40V Answer: 30-40V 5. The field control of a DC shunt motor gives ? constant torque drive constant kW drive constant speed drive variable load speed drive Answer: constant kW drive 6. The no load current in a transformer is ? Sinusoidal nonsinusoidal Trapezoidal stepped Answer: nonsinusoidal 7. Transformer cooling and insulation oil must be of ? low viscosity high viscosity low BDV low resistivity Answer: low viscosity 8. Single Phase transformers can be used in parallel only when their voltages are ? Equal Unequal Zero None of these Answer: Equal 9. 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 None of these Answer: reversed 10. 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 Answer: rotor resistance control | ||
