Understanding Electric Machines and Safety

What is the primary difference between AC and DC machines?

• AC machines use alternating current, while DC machines use direct current.

• AC machines are more efficient than DC machines.

• DC machines are used for high voltage applications.

• AC machines are smaller in size compared to DC machines.

Which of the following is a common application of DC machines?

• Household appliances

• Electric vehicles

• Power transmission

• Large industrial motors

How is torque calculated in a mechanical system?

• Torque = Force × Distance

• Torque = Mass × Acceleration

• Torque = Power × Time

• Torque = Velocity × Time

What is the unit of power in the International System of Units (SI)?

• Joule

• Watt

• Newton

• Volt

Which of the following is a method used in circuit analysis?

• Kirchhoff's laws

• Newton's laws

• Ohm's laws

• Faraday's laws

What is the purpose of a fuse in an electrical circuit?

• To increase voltage

• To protect against overcurrent

• To store electrical energy

• To convert AC to DC

Which regulation covers electrical safety in the workplace in Great Britain?

• Health and Safety at Work Act 1974

• Electrical Safety Standards Act 1985

• Workplace Safety Act 1990

• Electrical Equipment Safety Regulations 1994

What is the mechanical advantage of a lever?

• The ratio of output force to input force

• The ratio of input force to output force

• The sum of input and output forces

• The difference between input and output forces

Which of the following is a health risk associated with engineering?

• Exposure to loud noise

• Increased physical fitness

• Improved mental health

• Enhanced vision

What is the typical frequency of AC power supply in Great Britain?

• 50 Hz

• 60 Hz

• 100 Hz

• 120 Hz