electrical

Single Phase Induction Motor MCQ Objective Questions and Answers Page - 1

1.

A single phase induction motor is

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2.

A single phase induction motor is running at N rpm. Its synchronous speed is Ns. If its slip  with respect to forward field is s, what is the slp with respect to the backward field

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3.

A rotating magnetic field is produced by current is two windings displaced by 90 electrical degrees. This is the principle of

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4.

In an induction motor

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5.

The  torque developed by a single phase induction motor drops to zero at

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6.

The no load current of a sinlge phase induction motor is around ____% of full load current

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7.

The  power factor at which single phase induction mtors usually operate is

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8.

Which of the following tests are performed on single phase  ac motors

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9.

Single phase induction motors are made self starting by

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10.

The tow windings provided on the stator of a single phase induction motor, one main winding and the other auxiliary winding are connected

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11.

The stator winding of a single phase induction motor is splitted into two parts in order to

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12.

In a single phase induction motor

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13.

Phase splitting canbe accomplished  in  a single  phase induction motor

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14.

In a split phase motor the ratio of number of turns of auxiliary winding to that on main winding is

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15.

Why is a centrifugal switch used in a single phase induction motor

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16.

Centrifugal switch fitted on the rotor will operate when

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17.

The torque speed characteristic of two phase induction motor is largely affected by

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18.

The direction of rotation of a split phase induction motor can be reversed by reversing the connections to the supply of

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19.

The capacitor in a capacitor start induction run ac motor is connected in series with

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20.

A single phase induction motor is provided with a 3- phase slip ring rotor  connected to starting resistances. The motor would

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21.

Capacitor in a single phase induction motor is used for

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