Electrical Electronics Engineering MCQ Job Interview MCQ Questions Answers 5

Electrical Electronics Engineering  Job Interview MCQ 5

1.       As the temperature of a metallic resistor is increased the product of its resistivity and conductivity remain constant.

2.       The resistance of human body is about 1000 ohms.

3.       The filament of an electric bulb is made of tungsten.

4.       The hot resistance of electric bulb’s filament is higher than its cold resistance because the temperature co-efficient of filament is positive.

5.       A nichrome wire used as a heater coil has a resistance of 2 ohms/m .For a heater of 1 kW at 200 V, the length of the wire required is 20m.

6.       When 1 V is applied in a circuit a current of 1u A flows through it. The conductance of the current is 1 u mho.

Basic Electrical Engineering MCQ 4- Job Interview MCQ Questions Answers

Electrical Electronics Engineering Job Interview MCQ Questions Answers 4

 

1.       An electric heater is marked 2000 W,200 V. The resistance of the coil is 20 ohm.

2.       The current in a circuit having constant resistance is tripled. The power increases 9 times.

3.       What voltage drop will be there across a 1 kW electric heater whose resistance when hot is 40 Ohms?  Ans: 200 V

4.       In the case of liquids, ohms law is fully obeyed.

5.       A copper wire has a resistance of 10 ohms. It is stretched by one-tenth of its original length. Then its resistance will be - 12.1 ohms.

6.       No current flows between two charged bodies if they have same potentials.

7.       Best materials for making connecting wires-  copper

8.       The specific resistance of the material of wire depends on the material out of which the wire is made.

9.       Ampere- second is the unit of Charge.

10.   The percentage by which the incandescence of lamp decreases due to drop of current by 3% is-6%.

Electrical Materials Conductor-Semiconductor-Insulator

Electrical Materials: Conductor-Semiconductor-Insulator

Electrical Materials divided into three major parts:

                   1.Conductor 2. Semiconductor 2. Insulator

      

    1. Conductor:

     a. Conductor generated by metallic bonds. These bonds are based on the structure of the metal positive ions surrounded by a cloud of electrons.

     b. Conductors have a positive temperature coefficient of resistance. Resistance will increase with increasing      temperature.

     c. Conductors are used for carrying current in circuits.

    2. Semiconductors:

      a. Semiconductors are created by covalent bonds.

      b. Semiconductors have a negative temperature coefficient of resistance. Their resistance decreased with increasing temperature.

      c.Semiconductors used in the manufacture of electronic devices. [For example, crystal diodes, etc Transistor]

    3. Insulators:

     a. Insulators are mainly covalent compounds.

     b. I have isolated a negative temperature coefficient of resistance, their resistance decreases with increasing temperature.

     c. Insulators are used to limit the current path you want.

Electrical Engineering mcq- Basic Concept MCQ 3

Electrical Engineering- Basic Concept MCQ3

1.       The SI unit of conductivity is mho/m.

2.       The value of α (temperature co-efficient of resistance) depends upon nature of the material and temperature.

3.       At 0 K, germanium behaves as an insulator.

4.       The example of non-ohmic resistance is carbon resistance.

5.       If an electric current is passed through a nerve, the man begins to weep.

6.       A copper wire is stretched so that its length is increased by 0.1%. The change in its resistance is  0.2%.

7.       The best conductor of electricity silver.

8.       Ampere-hour is the unit of quantity of electricity.

9.       The resistance decrease with increase temperature Carbon.

10.   A wire having very high value of conductance is said to be very good conductor.