Q.1 When a battery is completely discharged, a battery is first charged at a_____.
A. constant voltage charging rate
B. constant current charging rate
C. Trickle charging
B. Boost charging
Ans.: B
Q. 2 When the cell voltage reaches a sufficient high value, the constant current charging is stooped and _______ is adopted.
A. Boost charging
B. Trickle charging
C. constant voltage charging
D. any of the above
Ans.: C
Q. 3 At what value of voltage the change over from constant current charging to constant voltage charging is takes place?
A. 2.50 V
B. 1.25 V
C. 2.30 V
D. 2.15 V
Ans.: D
Q. 4 The charged battery always losses some of its charges due to internal leakage and other open circuit loses. Which type of charging method is used for above case?
A. Boost charging
B. constant current charging rate
C. Trickle charging
D. none of the above
Ans.: C
Q. 5 The trickle charging current _____ of the normal charging current of the battery.
A. greater than 1%
B. Equal to 1 %
C. less than 1%
D. any of the above
Ans.: C
Q. 6 A minimum current cut out circuit is used to avoid____ of the battery.
A. fully charge
B. boost charged
C. overcharging
D. all of the above
Ans.: C
Q. 7 If the source of energy is alternating then the dc voltage required for the charging of a battery is derived from the ac source by using a ____.
A. inverter
B. rectifier
C. converters
D. SRC
Ans.: B
Q. 8 In charging from AC supply, the _____ monitors the charging current continuously above does not allow it to above a predetermined value.
A. current limiting circuit
B. IGBT
C. SRC circuit
D. any of the above
Ans.: A
Q. 9 Specific gravity is reduced in battery when a battery is___.
A. overcharging
B. Under charging
C. Trickle charging
D. boost charging
Ans.: B
Q. 10 What will happen if the specific gravity of electrolyte becomes more than 1.23?
A. loss of life
B. corrosion of the grids of the plates
C. loss of capacity
D. all of the above
Ans.: D
Q. 11 What will happen if a battery is wrongly connected on charge?
A. current drawn by the battery will be very high
B. current drawn by the battery will very small
C. current delivered by the battery will be very high
D. all of the above
Ans.: A
Q. 12 Which of the following primary cell has highest voltage?
A. Lithium cell
B. Mercury cell
vC. Carbon zinc
D. all are same voltage
Ans.: A
Q.13 Why petroleum jelly is applied to the electrical connection to the lead acid battery?
A. reduced resistance
B. prevent corrosion
C. increase heat dissipation
D. protect from external agent
Ans.: B
Q. 14 A constant voltage generator has___.
A. necessary control circuit
B. low internal resistance
C. high current rating
D. All of the above
Ans.: B
Q. 15 The level of _______ in a battery should be ___ of the plates.
A. water, below
B. electrolyte, equal
C. electrolyte, above
D. any of the above
Ans.: C
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