Electrical Circuits and Dangers of Electricity(Senior Class Physics Study by Topics) : GATE Academy

Welcome to your Electrical Circuits and Dangers of Electricity(Senior Class Physics Study by Topics)

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PHONE NUMBER

Which of the following gas has been used as insulating medium in electrical appliances?

Freon.

Sulphur hexafluoride

Nitrogen

Carbon dioxide

Surge arresters aboard marine are used for the protection of

Transformers

Motors

All components and switch gears

Generators

A material through which electric current CANNOT pass easily is a/an ____________________

Insulator

Conductor

Tester

Receptor

Which of these materials is a good conductor?

Gold

Plastic

Wool

What is the maximum current level a human can withstand without getting injured?

15mA

6 A

100-300mA

1mA

Which of these is NOT required in order to have a complete circuit?

Wires or path

Light switch

Source of electricity

Load or resistor

Most of our heavy equipment is not insulated which means what?

The ground beneath the equipment may be energized

You should stay in the equipment if you contact overhead power lines

Damage to the equipment could be catastrophic

All of the above

The greatest root-mean-square (effective) difference of potential between any two conductors of the circuit concerned.

Grounded

Watt

Voltage (of a circuit)

Thermopile

A circuit must have which of the following?

Energy source, wire, circuit tester

Energy source, battery, something to work

Energy source, wire, something to work

Energy source, wire, switch

10.

Which of the following is NOT a good conductor?

Plastic

Iron

Copper

11.

Switching surge is

Hyperbolically dying voltage.

High voltage ac

High voltage dc

Short duration transient voltage

12.

The minimum IR value usually recommended for MV machines as

1K Ohm/volt

Machine voltage (KV+1M)

Ohm Machine rating

None of the above

13.

If the voltage is 12 V and the resistance in the wire is 3 Ω, what is the the current in the circuit?

4 A

12 A

6 A

2 A

14.

What is an energy storage device composed of electrochemical cells?

A battery

A flashlight

A fuse

A circuit

15.

The severity of a shock depends on what?

The amount of current (amps)

The duration of the shock

All of the above

The path of the current through your body

16.

A/An _____________________ is used to turn the electricity in a current on or off

Insulator

Switch

Conductor

Battery

17.

Which type of fire extinguisher(s) is or are also acceptable to put out an electrical fire?

Class D

Class C

Class E

Class B

18.

If your heart stops, doctors can start it again by using a

Defibrillator

Pacemaker

Electric shocker

19.

Electric current in a/an ____________________ circuit travels in MORE THAN ONE path.

Series

Parallel

Connected

Wire

20.

Insulation and vibration testing are part of .....

Condition monitoring

Break down maintenance

Planned maintenance

21.

Which of the following is NOT a good insulator?

Glass

Iron

Plastic

22.

What is it that flows from a battery to a light?

Protons

Electrons

Neutrons

Atoms

23.

Small wires can easily puncture the skin.

False

True

24.

You have fuses instead of breakers in your house. One is blown. How do you know it's an overload, and not a short circuit?

The filament is broken inside the fuse

The glass on the fuse is broken

The glass is blackened out.

The fuse is totally melted

25.

If the resistance in the circuit is 10 Ω and the current is 3 A, what is the voltage of the battery?

30 V

10 A

3 V

3.33 V

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Electrical Circuits and Dangers of Electricity(Senior Class Physics Study by Topics)

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