Electrcian sem1 mod4 Basic electrical practice

How many electrons are there in the third cell of the copper atom?

• 8

• 13

• 18

• 29

Which is the semiconductor material?

• Eureka

• Ebonite

• Manganin

• Germanium

What is the indication of neon polarity indicator used for checking A.C. supply?

• Both electrodes will glow

• Only one electrode will glow

• Both electrodes will be flickering

• One electrode will glow and another will be flickering

Calculate the electrical energy in unit consumed by 500W lamp for 5 hours.

• 0.5 unit

• 1.0 unit

• 1.5 unit

• 2.5 unit

What is the value of hot resistance of a bulb rated as 100W/250V?

• 31.25 ohm

• 62.50 ohm

• 312.50 ohm

• 625.00 ohm

Which law states that in closed electric circuit, the applied voltage is equal to the sum of the voltage drops?

• Ohm’s law

• Laws of resistance

• Kirchhoff’s first law

• Kirchhoff’s second law

Calculate the total power of the circuit of two lamps rated as 200W/240V are connected in series across 240V supply?

• 50 W

• 100 W

• 200 W

• 400 W

What is the reading of ohmmeter across opened ‘R2’ resistor?

• Indicate zero reading

• Indicate infinite resistance

• Total resistance value of the circuit

• Value of sum of the resistance of R1 and R3 only

What is the change of resistance value of the conductor as its diameter is doubled?

• Increases to two times

• Decreases to four times

• Decrease to half of the value

• No change in value of resistance