Isolating Transformers

Froggy Jumps

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Physics

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Susana BM

New Zealand

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Isolating Transformers


Froggy Jumps Isolating TransformersVersion en ligne Physics par Susana BM 1 What is the main purpose of an isolating transformer? a Reduce electric shock hazard b Store energy c Increase voltage 2 In which case is an isolating transformer not needed? a When equipment is double insulated b When voltage is low c When frequency is high 3 What type of construction does an isolating transformer have? a Double wound b Auto transformer c Single winding 4 If an isolating transformer is designed for 230 V input, what is the output? a 230 V b 110 V c 400 V 5 What is true about the primary and secondary windings of an isolating transformer? a They have no electrical connection b They are directly connected c They use the same conductor 6 What is the electrical distribution system in New Zealand called? a Three phase, M.E.N. system b Single phase, grounded system c Double phase, isolated system 7 What is the voltage between phases in NZ system? a 400 V b 110V c 230 V 8 What is the voltage between any phase and the neutral point? a 230 V b 400 V c 110 V 9 What may happen if the earth wire is properly connected and a fault develops in an appliance? a The fuse may blow b The appliance speeds up c The appliance keeps working normally 10 Why is a broken earth wire especially dangerous (in a drill running)? a It goes unnoticed since the drill still operates b It makes the drill stop immediately c It causes the fuse to blow quickly 11 Why is a broken earth wire especially dangerous for the operator? a It can make the frame live and cause a fatal shock b It blows the fuse immediately c It reduces the machine’s power 12 Why does an isolating transformer reduce shock risk? a Its output is not connected to earth b It lowers the input voltage c It uses a thicker earth wire 13 What is special about an autotransformer? a Common winding b No core c Uses batteries 14 What is a disadvantage of an autotransformer? a No isolation b No voltage change c Heavy 15 What is a Variac? a Variable autotransformer b Fixed transformer c DC supply 16 What is a Variac used for in aircraft? a Lighting control b Fuel pump c Engine start 17 What voltage system do fixed autotransformers supply in aircraft? a 28 VAC b 48 VAC c 12 VAC

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Isolating Transformers

Froggy Jumps

À propos de cette activité

Créé par

Téléchargez la version pour jouer sur papier

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Isolating TransformersVersion en ligne

par Susana BM

What is the main purpose of an isolating transformer?

In which case is an isolating transformer not needed?

What type of construction does an isolating transformer have?

If an isolating transformer is designed for 230 V input, what is the output?

What is true about the primary and secondary windings of an isolating transformer?

What is the electrical distribution system in New Zealand called?

What is the voltage between phases in NZ system?

What is the voltage between any phase and the neutral point?

What may happen if the earth wire is properly connected and a fault develops in an appliance?

Why is a broken earth wire especially dangerous (in a drill running)?

Why is a broken earth wire especially dangerous for the operator?

Why does an isolating transformer reduce shock risk?

What is special about an autotransformer?

What is a disadvantage of an autotransformer?

What is a Variac?

What is a Variac used for in aircraft?

What voltage system do fixed autotransformers supply in aircraft?