Welcome To Online Test Semester 4, Module 4-Inverter and UPS

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Electrician and wireman 2nd Year

NAME *

NAME OF THE ITI *

MOBILE NUMBER *

1 What is the minimum permissible single phase working voltage, if the declared voltage is 240V as per ISI? *

2 punten

A 233 V

B 228 V

C 216 V

D 211 V

2 Which term refers that the mass of a substance liberated from an electrolyte by one coloumb of electricity? *

3 punten

A Electrolysis

B Electro plating

C Electro copying

D Electro chemical equivalent

3 What is the full form of abbreviation UPS? *

2 punten

A Uniform Power Supply | Uniform Power Supply

B Universal Power Supply | Universal Power

C Unregulated Power Supply | Unregulated

D Uninterrupted Power Supply

4 Which is frequency converter? *

2 punten

A Rectifiers

B D.C choppers

C Cyclo converters

D D.C to A.C converters

5 What is the full form of PWM? *

2 punten

A Pulse Wide Modulation | Pulse Wide

B Pulse Width Modulation | Pulse Width

C Phase Wide Modulation

D Phase Width Modulation | Phase Width

6 What is the advantage of on-line UPS over offline UPS? *

2 punten

A Supplies constant power output

B It gives constant output frequency

C Works on single phase or three phase supply

D Free from change over and transition problems

7 Which electronic circuit is used in a automatic voltage stablizer to produce constant output voltage? *

3 punten

A Rectifier circuit

B Amplifier circuit

C Oscillator circuit

D Feedback circuit

8 Which feedback network is used for automatic voltage stabilizer? *

2 punten

A Current divider network

B Voltage divider network

C Tapped transformer network

D Resistance temperature detector network

9 Which electrical device is actuating the voltages in a stepped voltage stabilizer? *

2 punten

A Autostat

B Output transformer

C Over voltage relay

D Under voltage relay

10 What is the effect in internal resistance of a discharged cell? *

2 punten

A Increase

B Decrease

C Becomes zero

D Remain same

11 Calculate the voltage and ampere/hour, if four cells rated as 1.5 v and 8 A.H are in parallel? *

4 punten

A 6 V and 24 AH

B 3 V and 16 AH

C 4.5 V and 8 AH

D 1.5 V and 32 AH

12 Which is the application of automatic stepped voltage stabilizer? *

2 punten

A Geyser

B Grinder

C Television

D Pump motor

13 Which is the function of an inverter? *

2 punten

A Converts A.C voltage into D.C voltage | A.C

B Converts D.C voltage into A.C voltage | D.C

C Converts D.C voltage into higher D.C voltage

D Converts A.C voltage into higher A.C voltage

14 What is the purpose of output transformer in inverters? *

2 punten

A Step up input AC

B Step down input AC

C Step up AC from amplifier

D Step down AC from amplifier

15 Which type of output transformer is used in automatic voltage stabilizer? *

2 punten

A Auto transformer

B Static transformer

C Ring core type transformer

D Ferrite core type transformer

16 Which principle the constant voltage transformer works? *

2 punten

A Self-induction principle

B Fall in potential principle

C Ferro-resonant principle

D Mutual induction principle

17 Which transformer is used in servo voltage stabilizer? *

2 punten

A Step up transformer

B Step down transformer

C Torodial autotransformer

D Constant voltage transformer

18 What is the type of A.C voltage stabilizer? *

2 punten

A Servo voltage stabilizer

B Automatic voltage stabilizer

C Manual stepped voltage stabilizer

D Constant voltage transformer stabilize

19 Which instrument is used to check short circuit faults in electronic circuit in voltage stabilizer? *

2 punten

A Ammeter

B Voltmeter

C Ohmmeter

D Multimeter

20 What are the important stages in a simple inverter? *

2 punten

A Oscillator and rectifier stages

B Oscillator and amplifier stages

C Amplifier and transformer output stages

D Oscillator, amplifier and transformer output stages

21 Where square wave inverters are used? *

2 punten

A Computers

B TV receiver

C DVD players

D General lighting

22 How the backup time of UPS can be increased? *

2 punten

A Increase the VA rating of UPS

B Increase the AH capacity of battery

C Decrease the AH capacity of battery

D Maintain battery terminal voltage always 90% of rating

23 How the hard insulation defect in secondary cell can be prevented? *

2 punten

A Provide trickle charging

B Provide freshening charge

C Provide constant current charging

D Provide constant potential method charging

24 Which part in UPS supplies continuous output voltage in case of input voltage failure? *

2 punten

A Battery unit

B Inverter unit

C Rectifier unit

D Controller unit

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

2 punten

A Buckling

B Polarization

C Local action

D Amalgamation

26 What is the reason for having low back up time in UPS? *

2 punten

A Fault in inverter circuit

B Battery is short circuited

C Mains earthing is not proper

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

27 Which is the cause for the fault if the output voltage of UPS is higher than normal? *

2 punten

A Battery get short circuited

B Defective feedback circuit

C Input voltage is very high

D Relay points are joined together

28 What is the reason for tripping the UPS with full load? *

2 punten

A Main supply failure

B Incorrect over load settings

C Battery charger input fuse blown out

D Loose connection in battery terminal

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