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Electrician
Electrician Set-2
Inverter and UPS
21

Inverter and UPS MCQ with Answers

21) How the backup time of UPS can be increased?

Increase the VA rating of UPS

Increase the AH capacity of battery

Decrease the AH capacity of battery

Maintain battery terminal voltage always 90% of rating

Answer is:

Increase the AH capacity of battery

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22) How the hard sulphation defect in secondary cell can be prevented?

Provide trickle charging

Provide freshening charge

Provide constant current charging

Provide constant potential method charging

Answer is:

Provide trickle charging

How the hard sulphation defect in secondary cell can be prevented?

23) Which part in UPS supplies continuous output voltage in case of input voltage failure?

Battery unit

Inverter unit

Rectifier unit

Controller unit

Answer is:

Battery unit

24) What is the effect during loading of the cell, the current strength falls and become zero?

Buckling

Polarization

Local action

Amalgamation

Answer is:

Polarization

25) What is the reason for having low back up time in UPS?

Fault in inverter circuit

Battery is short circuited

Mains earthing is not proper

Ampere hour (A.H) capacity of battery is not sufficient

Answer is:

Ampere hour (A.H) capacity of battery is not sufficient

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