EE MCQ

SSC JE Electrical 2019 with solution SET-2
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Which of the following heating element has the lowest operating temperature?

The melting point of Eureka is 1221 to 1300 °C

The melting point of Kanthal is 1,425 °C

The melting point of Nichrome is 1400 °C

The melting point of Graphite is 3,600°C

Hence Eureka has the least range of temperature.

Related Question

SSC JE Electrical 2019 with solution SET-2
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The input for a condenser in a steam power plant comes from a/an

Condenser – Condenser is a heat exchanger in which cooling water is circulated through the tubes. The exhaust steam from the turbine enters the condenser where it is cooled and converted to condensate (water).

SSC JE Electrical 2019 with solution SET-2
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The combined inductance of two coils connected in a series is 0.6H and 0.1H, depending on the relative directions of the currents to the coils. If one of the coils when isolated has a self-inductance of 0.2 H, then calculate the natural inductance?

The combined inductance of two coils connected in series

L = L1 + L2 + 2M

In series adding case

L1 + L2 + 2M = 0.6 H ——–(1)

In series opposing case

L1 + L2 − 2M = 0.1 H ——–(2)

Subtracting eqn (2) from eqn (1) we get

4M = 0.5 H

M = 0.125 H

Let L1 = 0.2 H (since the coil when isolated, its self-inductance is 0.2 H)

Putting the value of M & L1 in equation (2)

0.2 + L2 + 2 ×0.125 = 0.06

0.2 + L2 = 0.35

L2 = 0.15 H