EE MCQ

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

Related Question

SSC JE Electrical 2019 with solution SET-2
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A diode appears as in forward region of its characteristics?

A P-N junction acts as a voltage-controlled switch. During forward biasied the p-n junction diode acts like an ON switch. When reverse biased, it acts like an OFF switch.

SSC JE Electrical 2019 with solution SET-2
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When capacitors are connected in series across DC voltage then_____

When voltage is applied across the capacitor one plate becomes negatively charged with electrons leaving the battery. At the same time, electrons leave the other plate to resupply the battery, leaving that plate positively charged. This effect is called polarisation. The current flows until the charge across the capacitor is equal to the battery emf, at which point everything stops.

In series connections, the same charging current flows through all capacitors as soon as a voltage is applied. Hence in a series connection same current flows through each capacitor.

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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If the number of poles in an 11 KV transmission line is 80, then how many disc insulators are required?

No of disc required for 11 kV transmission line = 1 disc

Since the transmission line is 3-phase, therefore, the number of discs required for a single-pole will be 3.

Total no. of poles = 80

No of disc = 3 × 80 = 240