EE MCQ

SSC JE Electrical 2019 with solution SET-2
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_____type of single phase induction motor operates at better power factor at full load?

This type of motor is designed to operate with the start winding and it’s series capacitor permanently connected to the supply. lt has two capacitors connected in parallel in the start winding circuit for starting purposes. The running capacitor is employed to correct the power factor. As a result, this motor has a higher starting torque as well as a higher efficiency. These motors are employed in sizes ranging from 375 W to 7.5 kW. The power factor of these motor is upto 80% to 100%.

Related Question

SSC JE Electrical 2019 with solution SET-2
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Observe the given figure. If the diode is an ideal diode, then what are the values of Io and Vo respectively?

Io = V/R = 20/100

Io = 0.2 A

Since the given diode is an ideal diode therefore there is no voltage drop across it.

Vo = Io × RD

Vo = 0.2 × 0

Vo = 0

Hence Io = 0.2 A & Vo = 0

SSC JE Electrical 2019 with solution SET-2
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The work done on or by a unit N-pole in moving once around a closed path is equal to

**Ampere works law or Circuital Law**

This law relates to work done in a magnetic circuit i.e. closed magnetic flux path.

The work done on or by a unit N-pole in moving once round any complete path is equal to the product of current and number of turns enclosed by that path

SSC JE Electrical 2019 with solution SET-2
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For indoor lighting the range of space : height is

In order to achieve uniform illumination over a surface, the number of luminaries must be placed suitably. The space-height ratio plays a vital role in deciding the height of lamps from floor level and their spacing.**Space to height ratio**

It is defined as the ratio of horizontal distance between adjacent lamps to the height of their mountings.

In order to obtain almost uniform illumination over the working plane, the distance between the lamps should not be too much. An ideal scheme could be developed, when there is a large number of small size lamps. But this would increase the installation cost. To have uniform illumination, the ratio of the spacing between the lamps and their height above the working plane (i.e., space-height ratio) should normally lie between 1 and 2.

SSC JE Electrical 2019 with solution SET-2
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Observe the figure and find the correct relation from the four given options?

According to Kirchhoff’s law states that the current entering a node is always equal to the current leaving a node.

From the above Diagram

Current Flowing towards the Point: I1, I2, I6

Current Flowing Away from the Point: I3, I4, I5

Hence I1 + I2 + I6 = I3 + I4+ I5