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WorksheetsUnit 3 Revision 3
Total questions: 49
Worksheet time: 12hrs 15mins
Refer the figure shown. What is current flow through a diode?
Full wave of Ac cycle
One half of each ac cycle
Full wave of dc pulsed
no current flow
Refer the figure shown. what is the current flows in diodes 1and 2?
Both forward based
Both reversed biased
Diodes 1 Forward and diode 2 reversed
Diodes 1 reversed and diode 2 Forward
Refer the figure shown. what is the current flow in diodes 3 and 4?
Both forward based
Both reversed biased
Diodes 1 Forward and diode 2 reversed
Diodes 1 reversed and diode 2 Forward
Refer the figure shown. when the top terminal is positive and bottom is negative
How does the current flows through the load?
From the positive terminal through diode 3,the load and diode 4
From the positive terminal through diode1,the load and diode 2
From the negative terminal through diode1,the load and diode 2
From the negative terminal through diode 3,the load and diode 4
Refer the figure below. when the top terminal is negative and bottom is positive
How does the current flows through the load?
From the positive terminal through diode 3,the load and diode 4
From the positive terminal through diode1,the load and diode 2
From the negative terminal through diode1,the load and diode 2
From the negative terminal through diode 3,the load and diode 4
Refer to the figure shown; what is the effect of the capacitor in circuit?
Increase the AC input
Decrease the AC input
Smoothing the Pulsating Dc output
Smoothing the pulsating Dc input
Refer the figure below. What is the output effect DC pulses in point (A)?
Refer the figure shown. What is the output effect DC pulses in point (B)?
Where is the battery charger used?
Step up the voltage
charge and recharge a battery or cell
Invert the AC supply to DC supply
change the DC supply to AC supply
Where is the battery charger used?
Step up the voltage
Maintain a battery in a fully charged condition
Invert the AC supply to DC supply
change the DC supply to AC supply
When you connect charger. What must its polarity match?
Charger negative to battery positive and Charger positive to battery negative
Charger negative to battery negative and Charger positive to battery positive
Charger negative to battery positive only
Charger negative to battery negative only
What is method of charging .which the voltage at the battery terminals is held at a constant value?
Constant voltage charging
Constant current charging
Normal charge
Initial charge
What is method of charging when the battery and charger voltage are equal?
Constant voltage charging
Constant current charging
Normal charge
Initial charge
What is method of charging when the current setting is based on the ampere-hour rate of the battery?
Constant voltage charging
Constant current charging
Normal charge
Initial charge
What is method of charging when the voltage may rise to any value to provide current need?
Constant voltage charging
Constant current charging
Normal charge
Initial charge
What is the first charge applied to a new battery?
Normal charge
Initial charge
Constant voltage charging
Constant current charging
What is the routine charge gives each time the battery is discharge?
Normal charge
Initial charge
Constant voltage charging
Constant current charging
What is the discharge effect of battery?
The acid content of electrolyte increases and reduces the amount of electricity.
The acid content of electrolyte decreases and reduces the amount of electricity.
Excess water in the electrolyte.
Hydrogen gas.
What is the charging effect of a battery?
The water increases
The acid content of electrolyte decreases
sulfate from the plates Cause it to go back and become sulfuric acid
Oxygen gas only.
What is the charging effect of battery?
The water increases
The acid content of electrolyte decreases
the oxygen goes back to positive plate and becomes sponge lead
the oxygen goes back to positive plate and becomes lead peroxide
What are gases are produced in a charging battery?
Hydrogen only
Oxygen only
Hydrogen and oxygen gas
Acid gases
What is the charging hazard of battery?
Eclectic shock.
oxygen gas only
Loss of water causing excessive acid concentration.
Chemical hazard
What is the charging hazard of battery?
Excess heat
Eclectic shock.
Chemical hazard
Reduce life of battery
What is the charging hazard of battery?
electric shock
Explosive danger from Hydrogen and oxygen mix
Reduce life of battery
Chemical hazard
What can results if a charging cell produces heat above 120⁰ F?
Explosive danger from Hydrogen and oxygen mix
Loss of water causing excessive acid concentration
Bending /twisting of plate causing short circuit
The acid content of electrolyte decreases and reduce
What is determining charging time?
Charger Voltage.
Batter Voltage.
State of battery
Type of lead-alloy in plate
What is determining charging time?
Charger capacity.
Batter voltage
State of battery
Type of Acid
What is determining charging time?
Charger voltage
Batter capacity
State of battery
Type acid
What is determining charging time?
Charger voltage.
Batter voltage
State of charge
Type of electrolyte
Calculate the minimum charging time from the information listed below
Battery capacity = 400 Ahr for 8 hrs. discharge, Discharge time = 4 Hrs., Discharge current = 50 A, Charging capacity = 25 A
5 hrs.
6 hrs.
7 hrs.
8 hrs.
Calculate the minimum charging time from the information listed below
Battery capacity = 200 Ahr for 8 hrs. Discharge, Discharge time = 2 Hrs. Discharge current = 25 A, Charging capacity = 20 A
5 hrs.
4 hrs.
7 hrs.
2.5 hrs.
1. Refer to the charging table in figure below.
Calculate the charging time for battery capacity= 400 AHr for 8 hrs. discharge. if the cell plates are antimony alloy required 50% of 8 hrs. Discharge and the charging voltage is 2.33vpc.
5 hrs.
8.3 hrs.
7 hrs.
2.5 hrs.
1. Refer to the charging table in figure below.
Calculate the charging time for battery capacity= 400 AHr for 8 hrs. discharge. if the cell plates are antimony alloy required 40% of 8 hrs. Discharge and the charging voltage is 2.33vpc.
5 hrs.
8.3 hrs.
7 hrs.
2.5 hrs.
Refer to the charging table in figure below.
Calculate the charging time for battery capacity= 400 AHr for 8 hrs. discharge. if the cell plates are lead-Calcium alloy required 50% of 8 hrs. Discharge and the charging voltage is 2.33vpc.
5 hrs.
10.1 hrs.
7 hrs.
2.5 hrs.
Refer to the charging table in figure below.
Calculate the charging time for battery capacity= 400 AHr for 8 hrs. Discharge. if the cell plates are lead-Calcium alloy required 40% of 8 hrs. Discharge and the charging voltage is 2.33vpc.
5 hrs.
8.3 hrs.
7 hrs.
8.8 hrs.
What is the minimum float voltage?
2.15 to 2.20 vpc
2.20 to 2.33 vpc
2.15 to 2.17 vpc
2.10 to 2.15 vpc
What is the level of equalizing voltage charge?
2.15 vpc
2.20 vpc
2.30 vpc
2.33 vpc
Where is used the float voltage?
Keeps the battery at full capacity.
Supplies Ac directly to the load.
charge any cell
Small of current
Where is used the float voltage?
Recharge any cell in which there has been internal discharge
Keeps the battery at full Voltage.
Supplies Ac directly to the load.
recharge any cell in which there has been internal charge
In battery driven Dc system, what the battery charger used if the battery fails during an emergency?
Rectifier the DC supply
Inverter the AC supply
Supplies AC to the load
Supplies DC to the load
Where is used the float voltage?
Supplies Ac directly to the load.
Recharge any cell
Keeps the battery at full Voltage.
Does not charge cell already fully charged
What type of charge use to correct Sulfation?
Floating charge
Equalizing charge
Initial charge
Normal charge
What type of charge used if a battery has low voltage or low specific gravity?
Floating charge
Equalizing charge
Initial charge
Normal charge
What type of charge used when some battery lose a little of capacity?
Floating charge
Equalizing charge
Initial charge
Normal charge
What type of charge used it has causes an unequal output?
Floating charge
Equalizing charge
Initial charge
Normal charge
Which one of the following guidelines for battery charger when performing Preventive Maintenance?
Testing the current of battery
Checking the room temperature
Testing the Voltage of battery
Checking the security of Cable and terminal
Which one of the following guidelines for battery charger when performing Preventive Maintenance?
Testing the current of battery
Checking the room temperature
Testing the Voltage of battery
Checking the Physical condition
Which one of the following guidelines for battery charger when performing Preventive Maintenance?
Testing the current of battery
Checking the room temperature
Checking the grounding is correct
Testing the Voltage of battery
Which one of the following guidelines for battery charger when performing Preventive Maintenance?
Testing the current of battery
Checking the room temperature
Testing the Voltage of battery
Checking the meter is correct adjustment
