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SSC JE Electrical 2019 with solution SET-2
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The wattage rating of a single-phase induction motor used as a ceiling fan will be in the range of

The wattage rating for a ceiling fan motor is in the range of 50 to 150 W. if the ceiling Fans size ranges from 36 inches to 56 inches then the total wattage use is 55 to 100 watts.. A 48-inch ceiling fan will use 75 watts.

SSC JE Electrical 2019 with solution SET-2
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Which of the following motors can be connected across a single-phase AC supply?

A DC motor can be operated from a single-phase AC supply.

The direction of the torque produced by a DC machine is determined by the direction of current flow in the armature conductors and by the polarity of the field.

Torque is developed in a DC machine because the commutator arrangement permits the field and armature currents to remain in phase, thus producing torque in a constant direction.

A similar result can be obtained by using an AC supply, and by connecting the armature and field windings in series.

SSC JE Electrical 2019 with solution SET-2
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The number of valence electrons of P and Si are respectively?

Phosphorus (P) has 15 electron i.e 2,8,5. Hence the number of electron in its outermost orbit is 5.

Silicon (Si) has 14 electron i.e 2,8,4. Hence the number of electrons in its outermost orbit is 4.