EE MCQ

SSC JE Electrical 2019 with solution SET-2
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Four statements are given below. Identify the correct statement?

**Basic logic gates**: Basic logic gates are the building blocks of digital circuits that perform logical operations such as AND, OR, and NOT, on the binary inputs. Basic gates are mainly used in the fabrication of digital systems and are called integrated circuits (ICs).

**Derived logic gates**: Derived logic gates arc those logic gates that perform logical operations on the binary inputs with the help of two or more basic logic gates. A combination of AND, OR, and NOT are called derived gates. NAND, NOR, XOR, and XNOR are such a combination of AND, OR, and NOT gates.**Exclusive OR (XOR) Gate**

A gate that identifies the odd number of 1’s in the combination of the inputs is called the XOR gate. It is a functional combination of NOT, AND, and OR gates.

Related Question

SSC JE Electrical 2019 with solution SET-2
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The flux while crossing air gap tends to bulge outwards, thereby increasing the effective area of the gap, this effect is known as

Magnetic Fringing

When flux enters into the air gap, it passes through the air gap in terms of parallel ﬂux lines. There exists a force of repulsion between the magnetic lines of force which are parallel and having the same direction. Due to this repulsive force, there is the tendency of the magnetic flux to (spread out) at the edge of the air gap. This tendency of ﬂux to spread out at the edges of the air gap is called magnetic fringing.

Magnetic fringing increases the effective cross-sectional area of the air gap reduces the flux density. So leakage, fringing, and reluctance should be as small as possible. This is possible by choosing a good magnetic material and making the air Magnetic fringing gap as narrow as possible.

SSC JE Electrical 2019 with solution SET-2
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Which of the following instruments has a uniform scale?

In the PMMC type instrument, the deflection is directly proportional to the current flowing through the instrument, we get a uniform scale for the instrument. It gives a uniform scale of upto 270° or more.

Td ∝ I

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%.