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T2 Q3

Start buttons in a DOL motor control circuit are wired

in parallel with the existing start button

within a DOL wiring circuit emergency stop N/C contact and a remote stop N/C contact are wired

in series with eachother

Within a DOL wiring circuit the N/C closed auxiliary contact of an overload relay is wired

in series with the control stop button

when immersed in water the magnetic field around a permanent magnet will

remain the same

The RMS of a sine wave is calculated by using

0.707 x peak value

the average of a sinewave can be calculated by which of the following

peak x 0.637

The three phase supply is connected in star in order to

create a neutral point

with regard to magnesium oxide as an insulation material which of the following statements is incorrect

it is resistance to carbon dioxide and moisture from the atmosphere

SWA cable buried directly in soil in agricultural installations shall be buried a minimum depth of

600mm

Cables buried in the ground and are enclosed in ducting having a high resistance to impact, other than concrete should be coloured

red

The phase voltage (Uph) of a 400V three phase DELTA supply is

400V

Fire performance cables that are laid onto cable tray should be

should be clipped to tray using copper or stainless steel clips with brass screws or bolts

the minimum level of protection in a wet location of an agriculture premieres which are housed down such as milking parlors and dairies is

IP44

When comparing the heating effects of an alternating supply that has a maximum current of 7A with that of a DC supply that has a current of 5A it can be said that

both circuits generate the same anount of heat

The peak to peak value of a sinewave can be calculated by which of the following formula

peak x 2

the number of full cycles completed by a 50HZ Ac supply in 1 minute is

3000

which of the following coils would have the strongest magnetic field when a current of 2 anos AC flows through it

a coil with 500 turns

which of the following cannot be displayed by an oscilloscope

RMS voltage value

the property of an electrical circuit that opposes the charge in current flow is

impedence

When a 50Hz AC supply of 230V is connected across the plates of a 400V capacitor that is connected in series with a lamp

the capacitor will charge and discharge in sequence with the frequency and the lamp will stay illuminated

Which of the following denotes Inductanve Reactance

XL and is stated in Ohms

The frequency of a 130V DC supply is

0Hz

The display on a digital volt-meter that is set at AC is the

Root mean squared value of the supply

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