## An iron-cored coil of 2000 turns produces a magnetic flux 0f 30mWb when a current of 10A is flowing the d.c. supply. Fund the average value of induced e.m.f if the time of opening the supply switch is 0.12 second. The residual flux of the iron is 2mWb.

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3 weeks 0 Answers 9 views

## Find the generated e.m.f./conductor of a 6-pole d.c. generator having a magnetic flux/pole of 64mWb and a speed of 1000 rev/min. If there are 468 conductors, connected in six parallel circuits, calculate the total generated e.m.f of the machine. Find also the total power developed by the armature when the current when the in each conduct is 50A.

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3 weeks 0 Answers 10 views

## Calculate the e.m.f generated in the axles of a railway train when traveling at 100km/h.The axles are 1.4m in length and component of the earth’s magnetic field density is 40μT.

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3 weeks 0 Answers 10 views

## If the flux density inside a solenoid coil is measured to be 140mT and the inside diameter of the solenoid is 40mm, find the value of the total flux produced.

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1 year 0 Answers 53 views

## A diesel engine has a measured indicated power of 7.5 kW and a mechanical efficiency of 85 percent. It drives a generator which supplies a lamp load at 110V. How many 60W lamps can be supplied, if the efficiency of the generator is measured to be 88 percent? Find the total load current.

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1 year 0 Answers 50 views

## Define the following

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The newton The Joule The Watt The Ampere The Coulomb The Volt The Ohm
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1 year 0 Answers 32 views

## A pump is required to lift 1200 litres of water through 10 metres in 6 minutes. Calculate the work done in joules and the power rating of the pump. Assume 1 litre of water to have a mass of 1 kilogramme.

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1 year 0 Answers 49 views

## State the ohm’s law

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1 year 0 Answers 33 views