TD yr11

What is the unit of electrical resistance?

• Ampere

• Ohm

• Volt

• Watt

Answer explanation

The unit of electrical resistance is Ohm, represented by the symbol Ω.

What does LED stand for?

• Light Emitting Diode

• Light Energy Diode

• Linear Emitting Diode

• Linear Energy Device

Answer explanation

LED stands for Light Emitting Diode, making the correct answer choice Light Emitting Diode.

Which formula represents the relationship between power (P), voltage (V), and current (I)?

• P = VI

• P = V/I

• P = V + I

• P = V^2I

Answer explanation

The correct formula is P = VI, which represents the relationship between power (P), voltage (V), and current (I).

Which material is typically used for vacuum forming because of its ability to reshape when heated?

• PVC

• Polycarbonate

• Polyethylene

• Thermoplastic

Answer explanation

Thermoplastic is typically used for vacuum forming because of its ability to reshape when heated.

Brass is an alloy made up of which two metals?

• Copper and Tin

• Zinc and Copper

• Aluminum and Silicon

• Iron and Carbon

Answer explanation

Brass is an alloy made up of Zinc and Copper, not Copper and Tin, Aluminum and Silicon, or Iron and Carbon.

What is the gear ratio if the driver gear has 10 teeth and the driven gear has 30 teeth?

• 01:03

• 03:01

• 02:05

• 05:02

Answer explanation

The gear ratio is calculated by dividing the number of teeth on the driven gear by the number of teeth on the driver gear. In this case, 30 divided by 10 equals 3. Therefore, the gear ratio is 1:3.

In a simple gear train, the velocity ratio is defined as the:

• Diameter of the driver divided by the diameter of the driven

• Number of teeth on the driver divided by the number of teeth on the driven

• Product of the diameters of all gears involved

• Sum of the radii of the driver and driven gears

Answer explanation

The velocity ratio in a simple gear train is defined as the diameter of the driver gear divided by the diameter of the driven gear.

What component is used to measure electric current?

• Ammeter

• Voltmeter

• Resistor

• Capacitor

Answer explanation

An ammeter is used to measure electric current, making it the correct choice in this scenario.

A Light Dependent Resistor (LDR) is classified as a/an:

• Output component

• Input component

• Process component

• Independent component

Answer explanation

An LDR is classified as an Input component as it detects light intensity and converts it into electrical signals for processing.

To ensure safety when using a pillar drill, which of the following should be done?

• Use a blunt drill bit

• Apply excessive force

• Secure the workpiece

• Leave the guard open

Answer explanation

To ensure safety when using a pillar drill, it is important to secure the workpiece to prevent accidents or injuries.