COMMERCIAL WIRING 2 - Practice Mode

1) Which metal is used to make contact points of thermostat?

Copper Silver Aluminium Brass

Correct Answer: Silver

2) What is the property of heating element used in electrical heating appliances?

Low co efficient of expansion Low specific resistance Low mechanical strength Low voltage withstanding

Correct Answer: Low co efficient of expansion

3) Which is the permissible voltage drop in declared voltage supply to HT consumer as per IE rule?

Not more than 5% Not more than 8% Not more than 10% Not more than 12%

Correct Answer: Not more than 12%

4) Which wiring system is suitable for high rise buildings?

Looping out from switches Distribution system Ring main system Tree system

Correct Answer: Tree system

5) Which type of distribution is suitable for commercial wiring of multistoried flats?

Looping out with junction Looping out with swit Bus chamber Raising mains

Correct Answer: Raising mains

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