T2 industrial

When using Flemings left hand rule the thumb points in the direction of ?

Force exerted on the conductor

An advantage of steel conduit over plastic is

a seperate protective conductor is not required

IS/EN 60309 sockets outlets rated for 230 volt are coloured

Blue

The centrifugal switch of a single phase split phase induction motor is used to

Disconnect the run winding

Steel conduit is available in what sizes

16mm, 20mm, 25mm, 32mm

Where cable or busbar trunking passes through a ceiling it must contain

A fire barrier

Which type of supply produces a sinusoidal waveform

A.C. generator

One of the main functions of a contactor is

Provide no-volt protection

An open circuit on the coil electromagnet has

Infinite resistance and zero inductance

which circuit is regarded as a category B circuit

Fire alarm circuit

The minimum information which should be displayed on a distribution board labelling system is

Circuits controlled

The formula millivolts/amp/meter is used to calculate

Vold drop of a conductor

One factor that does not affect the resistance of a conductor is

The type of insulation of the cable

Compact fluorescent lamps are less expensive to operate than the filament lamps because

Their efficiency is higher with a longer working life

The capacitor connected across the incoming supply terminals in a fluorescent fitting is to

Improve power factor

The voltage between any two phases of a 400v three phase 4 wire supply is

230 volts

The conductors contained in a busbar trunking system are

Bare copper or aluminium bars

The effect that limits the current flow in a pure inductor connected to ans A/C supply is called the

Inductive reactance

When capacitors are connected in series, the applied voltage is

The sum of the voltages across each of the capacitors

Flemings right hand rule is used to determine the direction of field, current and force in a

Generator

The second digit in the IP classification system for enclosures mean

The degree of protection against ingress of water

If one of the supply lines connected to a three phase induction motor becomes disconnected the current through the other two lines will

Increase

To change the direction of a three phase motor it is necessary to change

Any two of the three line conductors

The minimum I.P protection on fittings where water hosing is used is

I.P 45

one of the supply lines to a three phase motor becomes open circuit the voltage through the other two will

Remain the same

B type MCBs will operate magnetically at

3-5 times its rated current

If the capacitor across the mains in a fluorescent fitting becomes disconnected the lamp will

Still function

In relation to cables what does LSF mean

Low smoke and fume

A permanent

Requires no external power force

Lens law states that

An induced EMF will always oppose the effect producing it

The mechanism connecting the rotating windings to the brushes in a DC generator is called

The slip rings

when comparing the heating effect of 10amps RMS AC with 10amps DC the result will be

The same heating effect

The voltage between either current carrying conuctor and earth on the secondary winding of a portable 230V/115V transformer for power tools is

57.5 volts

On a running coupler the exposed threads should be

painted with galvanised spray

The standard supply voktages in ireland are

400v and 230v

Eddy current losses in a power transformer is minimised by

Constructing the core with steel laminations

The main disadvantage of magnesium oxide as an insulator in a cable is that

It absorbs moisture when exposed to the atmosphere

The arc-quenching medium used in HBC fuse

silica sand/quartz

when using a clip on ammeter to check the motor current it is necessary to have the motor

connected to the motor and running

The minimum level of IP protection on all fittings for general areas in a farm installation is

IP44

Which combination of the following is required in order to induce an electrical current.
1. Motion
2.Magnetic field
3. Conductor
4.Voltage

1.2.3

If an iron core is inserted in a solenoid and the current is maintained at a constant value the magnetic flux will

Increase in strength

Earth continuity of metallic trunking can be improved if

Copper earth straps are bolted across all joints

Using flemings r/h or l/h rule the second finger points in the direction of the

current flow

the term GLS means

general lighting service

an advantage if aluminium conductors is

they are lighter than copper

The IP classification system the second digit states