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WorksheetsUnit 3 Revision 2
Total questions: 50
Worksheet time: 13hrs 30mins
What do you call the effect of the cell size and weight on a battery?
Battery voltage
Battery resistance
Battery Capacity
Battery frequency
What does the battery’s Capacity effect?
voltage
Amount of Current and length of time
Number of cells
electrolyte material
What is the factor that determines a Battery’s Capacity?
Plate material
Battery condition
voltage
Number of cells
What is the factor that determines a Battery’s Capacity?
Low voltage limit
voltage
Type of connection cells
Plate material
What is the factor that determines a Battery’s Capacity?
voltage
number of cells
plate material
concentration of electrolyte
What is the factor that determines a Battery’s Capacity?
Contact area between plate and electrolyte
voltage
number of cells
plate material
Standard battery testing procedures include measuring of:
Current, temperature and voltage of cells
Voltages and currents of cells
Electrolyte concentration and temperature of cells
Specific gravity, temperature and voltage of cells
As part of battery testing a routine battery tests must be done _________________
Every month
twice every month
at least once every three months
at least once every four months
Why do you measure cell electrolyte specific gravity?
To know acid temperature
To know acid concentration
To know water level
To know H2O electrolyte
What is the peak output voltage of lead acid cells?
1.80 v to 2.25 VPC
2.20 v to 2.25 VPC
2.00 v to 2.25 VPC
2.08 v to 2.25 VPC
What is the final or minimum voltage of lead acid cell?
1.40 VPC
1.50 VPC
1.60 VPC
1.70 VPC
In plants with critical loads, what voltage level does a lead acid need to be the battery charged?
below 2.07 V
below 2.08 V
below 2.70 V
below 2.15 V
What is the normal specific gravity reading of fully charged cell around?
1.160
1.175
1.210
1.835
What is the normal specific gravity reading of discharged cell around?
1.160
1.175
1.210
1.835
The battery should be replaced when electrolyte specific gravity falls below?
1.160
1.175
1.210
1.835
What type of measuring instrument used to measure specific gravity of battery?
Volt meter
Hydrometer
Thermometer
Ampere meter
Battery manufacturers set specifications for corrected specific gravity at_________
75oF
77oF
79oF
81oF
What is the cell corrected specific gravity. The hydrometer reading is 1.208 and the electrolyte temperature in the battery bank is 86oF
1.201
1.211
1.210
1.212
What is a physical sign of leaking electrolyte around the cell terminals?
Corrosion
Sulfation
Neutralizing
Loose connection
After cleaning the terminals of the battery put ____________ to prevent future corrosion
Petroleum jelly
Oxide grease
Paint
Bicarbonate of soda
Is caused by leaks in terminal post seals and electrolyte spills.______________
Sulfation
Neutralizing
Corrosion
Loose connection
What Causes corrosion on batteries?
Leaks on terminals post seals
High ambient temperature
Low electrolyte level
Presence of baking of soda
It can creating an open circuit in the battery bank______________
Sulfation
Neutralizing
Corrosion
Short circuit
What is the result if corrosion on battery terminal connection?
Short circuit
Open circuit
Sulfation
Neutralizing
What will be used when cleaning the terminal and the tops of the cell?
Emery paper
Plastic brush
Wet cloth
Distilled water
What can cause Low float charging voltage or low electrolyte levels?
Neutralizing
Corrosion
Loose connection
Sulfation
1. The results from a low state of charge in the battery called a __________
Neutralizing
Corrosion
Loose connection
Sulfation
What type of tool would use to tighten a battery link connection?
Screwdriver
Insulated Wrench
Spark resistant wrench.
Spanner
What could happen if battery terminal links are loose connections?
High resistance in the cell connections.
Corrosion to build up to the terminals.
Leaks at the terminal posts.
The cell to over-discharge.
It can cause a short circuit between the cell plate ______________
Sulfation
Neutralizing
Corrosion
Loose connection
What type of charge battery used to prevent Sulfation?
Floating charge at 72 hours
Equalizing charge at 72 hours
Initial charge at 72 hours
Normal charge at 72 hours
Why do you need to apply equalizing charge to battery?
Recharge any cell in which there has been internal discharge
Keeps the battery at full Voltage.
to correct Sulfation on battery
Supplies Ac directly to the load.
What must be done before replacing a faulty cell while battery bank in service?
provide new battery in parallel to the bank
add one more battery in series to the bank
provide a Direct current path after removing the link
provide an Alternate current path before removing the link
What happens if one cell in battery bank has low much lower specific gravity than the other cells?
Cell will have longer life
No reaction
It will burn.
It drains power from the battery bank and reduce its life
After 72 hours of equalizing charge if battery specific gravity does not rise to aerated level. What should you do?
Keep the battery in the bank
Recharge again.
Apply float charge
Replace battery
What should be put an equalizing charge on a battery bank if unequal Specific gravity?
70 Hours
71 Hours
72 Hours
74 Hours
When put an equalizing charge on a battery bank?
If the specific gravity of one cell drops more than 10 points below the average
If the specific gravity of three cell drops more than 10 points below the average.
If the specific gravity of two cell drops more than 10 points below the average.
If the specific gravity of any cell drops more than 10 points below the average.
After 72 hours of equalizing charge if battery specific gravity does not rise to aerated level usually __________should be replace
1.160
1.175
1.210
1.835
What Battery room temperature are designed and avoid reducing the battery overall performance?
Near to 77⁰ F
Near to 67⁰ F
Near to 85⁰ F
Near to 70⁰ F
Which of the following reduces the life of a battery?
Excessive heat only
Excessive cold only
Both Excessive heat and cold
Use of baking soda
If the ambient temperature increases in the battery room .what is the effect?
Slow down the electrolyte action of the cells.
Increases the output voltage of the cells.
Increases the rate of cell discharge.
Put impurities in the electrolyte.
If find sign of discoloration on the plates, or sediment on the electrolyte. What you should do?
Clean the cell’s terminals.
Add extra sulfuric acid to the electrolyte.
Place an equalizing charge on the battery bank.
Add baking soda to the electrolyte.
When on cell has an electrolyte specific gravity more than 10 points (0.010) below the other cells, you should_______________
Clean the cell’s terminals.
Add water to the cells
Put equalizing charge on the battery bank.
Put a float charge on the battery.
What you should do to prevent sulfation?
You should over charge the cells.You should over charge the cells.
Electrolyte level must be kept between high and low level.
Clean and sad petroleum jelly on the terminals cells
Loose the cell’s terminal connections.
What is the effect ambient high temperature in a cell’s chemical activity?
The cell producing excess gas and a high discharge
The cell will drop ,reducing overall performance
If the specific gravity of one cell drops more than 10 points below the average.
If the specific gravity of three cell drops more than 10 points below the average
What is the effect ambient Low temperature in a cell’s chemical activity?
The cell producing excess gas and a high discharge
The cell will drop ,reducing overall performance
If the specific gravity of one cell drops more than 10 points below the average.
If the specific gravity of three cell drops more than 10 points below the average
What is the output waveform effect DC pulse?
What would be the output waveform of the full-wave bridge diode?
Refer the figure shown. What Happen during the Positive half of ac cycle?
The diode is forward biased allowing no current flow
The diode is forward biased allowing current flow
The diode is reverse biased allowing no current flow
The diode is reverse biased allowing current flow
Refer the figure shown. What Happen during the Negative half of ac cycle?
The diode is forward biased allowing no current flow
The diode is forward biased allowing current flow
The diode is reverse biased allowing no current flow
The diode is reverse biased allowing current flow
