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what is UPS ?

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UPS is Uninterrupted Power Source
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Description : what is UPS and what are its uses?

Answer : Ups means uninterrupted power supply It supplies power when there is power supply outage. This is done by storing power in battery banks while power is on and then during power outage the DC in battery is converted to a.c by inverters

Description : What is the need of UPS?

Answer : 1) An Uninterruptible Power Supply (UPS) is used to protect critical loads from mains supply problems including spikes, voltage dips, fluctuations and complete power failures using a dedicated battery. 2)A UPS system can also be used as standby system when AC mains is failed.

Description : Describe working of online UPS. List any two applications of UPS.

Answer : Online UPS: The block diagram of the on line UPS systems is as shown, where the load is connected to the invertor through the UPS static switch. The UPS static switch is ... 4) Healthcare: hospitals, clinics and retirement homes 5) Telecommunications 6) Special projects (events)

Description : Explain the operation of UPS with a neat block diagram.

Answer : Uninterruptible-Power-Supplies (UPS): A block diagram of UPS system is shown in figure. It essentially consists of four major components: i)Rectifier (or battery charger) ii) ... . Due to fast action requirement, transfer switch can be implemented by fast acting semiconductor devices.

Description : Define transfer time and back up time of UPS.

Answer : Transfer time of UPS: The transfer time, sometimes also called switchover time, is the amount of time the UPS will take to switch from utility to battery supply during a mains failure, or from battery to ... is the amount of time for which the UPS will supply the power to load during mains failure.

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Answer : How to do push-ups from the floor? Physical self-improvement with the help of strength exercises is quite popular today. The incentives to start such work are varied - solving health problems, body ... any special equipment in your usual home environment. Go in for sports, be healthy and happy!

Description : An electrochemical cell which is used as a source of direct electrical current at constant voltage under standard conditions is called a : (1) Power transmittor (2) Battery (3) Uninterrupted power supply (UPS) (4) Generator

Answer : Battery

Description : The economist who believed that unemployment is impossible and that market mechanism has a built in regulatory system to meet any ups and downs (1) J.M.Keynes (2) Ohlin (3) J.B.Say (4) Galbraith

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Description : State any three points of difference between online UPS and off-line UPS. 

Answer : On-line UPS  Off-line UPS An on-line UPS continuously powers the protected load from its reserves (usually lead-acid batteries or stored kinetic energy), while simultaneously replenishing the ... the mains power.  In this type of UPS frequency stability is always available. 

Description : With the help of diagram explain working of UPS

Answer : The UPS delivers uninterrupted power to the ac load. It consists of the following functional blocks: AC mains section contains filter, transformer and rectifierIt receives ac supply, ... has synchronization circuits for smooth change-over from mains to inverter ac avoid waveform distortion.

Description : A UPS : A) increases the storage capacity of a computer system B) increases the process speed C) provides backup power in the event of a power cut D) increases I/O speed

Answer : A UPS : provides backup power in the event of a power cut

Description : A UPS commonly has following parts : (i) rectifier (ii) inverter (iii) static switch Which of the following is true ?   (a) only (i) (b) only (i) and (ii) (c) (i), (ii) and (iii) (d) only (ii) and (iii) 

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Answer : It is unity power factor but difficult to achieve in dynamic loads

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Answer : kW is kilowatt and kVA is kilovolt ampere. kW is unit of real power and kVA is unit of Apparent power.

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Answer : Reduced copper losses Smaller conductor size Improve voltage regulation Increase system capability Less energy bill

Description : What is meant by KVA?

Answer : KVA - kilo volt ampere  Used to specify the transformer details

Description : What is the cause of voltage fluctuation?

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Description : What are the main causes of harmonics?

Answer : Harmonic is a non linear load because linear load voltage deviated due to connection of some electrinie device such as converter,inverter

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Description : What is the cause of a brownout?

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Description : What causes transients?

Answer : Transient is a peak voltage take small period. It will occur due to lightning

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Answer : While taking a more load from other Equipment

Description : What is the definition of brownout?

Description : What can cause a voltage spike?

Description : What would cause a power surge in a house?

Answer : If your neibour / other flat owners / your maintainer staff switch on any type of inductive load that can cause power surge / dip  

Description : What is meant by power dip?

Description : What is voltage interruption?

Description : What is meant by a voltage surge?

Description : What is voltage sags and swells?

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