SSC JE Electrical Engineering 2015

Instructions

For the following questions answer them individually

Question 181

The magnitude of AT required to establish a given value of flux in the air gap will be much greater than that required for iron part of a magnetic circuit, because:

Question 182

The area of the hysteresis loop will be least for one of the following materials.It is:

Question 183

A current of 2A passes throught a coil of 350 turn wound on a ring of mean diameter 12cm. The flux, density established in the ring is 1.4 $$\frac{wb}{m^{2}}$$ . Find the value of relative permeability of iron:


Question 184

A bar of iron 1 $$cm^{2}$$ in cross-section has 10-4 Wb of magnetic flux in it. If $$ \mu $$r = 2000 what is the magnetic field intensity in the bar?

Question 185

One sine wave has a period of 2 ms, another has a period of 5 ms, and other has a period of 10 ms. Which sine wave is changing at a faster rate?

Question 186

. In a pure inductive circuit if the supply frequency is reduced to $$\frac{1}{2}$$, the current will:


Question 187

There are 3 lamps 40W, 100W and 60W. To realise the full rated power of the lamps they are to be connected in:

Question 188

Two lamps, Green (G) and Red (R) are connected in a motor circuit as shown in the figure. The conditions under which the lamps will burn are, (supply is available at terminals A & B):

Question 189

Modern electronic multimeters measure resistance by


Question 190

If a dynamometer type wattmeter is connected in an ac circuit, the power indicated by the wattmeter will be

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