Unit 202 Revision #3

The mass of an object was measured as 110 grams. What is the weight of the object in Newtons?

• 1078N

• 1.078N

• 27.6N

• 1078kg

The SI units of current, resistance & power are respectively

• electron, resistivity and newton

• ampere, ohm and joule

• weber, ohm and watt

• ampere, ohm and watt

If the total magnetic flux in a coil is divided by the cross sectional area of the coil, the unit produced will be measured in

• Tesla

• Henry

• Pascal

• Newton

A conductor 100m long has across sectional area of 1mm² and a resistance of 2Ω. If the conductor is cut into two 50m lengths and joined in parallel, the resistance of the combined conductor will be

A simple machine consists of a coil of wire being rotated within a magnetic field by an exterior force. This will demonstrate the principle of a

• motor

• cage

• generator

• rectifier

The sinusoidal waveform (sine wave) shown in figure 1 below will be produced by a

• d.c. generator

• a.c. motor

• a.c. motor

• a.c. generator

A machine has an input of 10kW and an output of 7.5kW. The efficiency of the machine will be

• 17.5%

• 75%

• 2.5%

• 133.3%

Which one of the following conductive materials would not be used in a flexible cable

• carbon rod

• copper

• aluminium

• steel

Which one of the following materials is not an insulator

• glass

• polyvinyl chloride

• germanium

• polyethelyne

An emf may be produced in three ways. These are

• chemical, magnetic and inductive

• chemical, magnetic and thermal

• magnetic, thermal and fictional

• inductive, thermal and reactive