Unit 262, Practice set 2

For resistors in parallel, the total resistance will always be:

• Larger than the largest value resistor

• Smaller than the lowest value resistor

• Equal to the sum of all resistors

• Equal to the sum of the first resistor and circuit voltage

Which defines power the best

• Power is proportional to the square of the time taken

• Power is done when a force is moved through a distance

• Power is the quality of the energy

• Power is the rate of consumption of energy

Which best defines work

• Work is the rate of consumption of energy

• Work is the quality of energy

• Work is done when a force is moved through a distance

• Work is proportional to the square of the time taken

From Table 1, which of the following lists the density from low density to high density

• Gold/Silver/Copper/Steel/Aluminium

• Aluminium/Steel/Copper/Silver

• Steel/Copper/Aluminium/Gold/Silver

• Copper/Aluminium/Steel/Silver/Gold

Why is an idler gear used?

• To reduce friction

• To increase gear ratio

• To act as a brake on the output gear

• To produce the same direction of rotation in each gear

Which is the correct relationship between voltage, current and resistance

• V = IR

• R = VI

• I = R/V

• V = 1/R

Which two properties affect the voltage drop along a cable

• Area and type of insulation

• Resistivity and density

• Resistivity and length

• Area and tensile strength

A disconnected cable may be live because of which of the following

• Mutual Inductance

• Lenz's Law

• A decrease in temperature

• Increased conductivity

Energy may be stored in a cable due to

• Resistance

• Capacitance

• Impedance

• Conductivity

A magnetic field strength depends on

• Distance and flux

• Flux and cross sectional area

• Cross sectional area and distance

• Temperature and cross sectional area