 Home » Electrical Engineering » Electrical Engineering MCQ » Electrolysis and Storage Batteries ### 1.?The mass of an ion liberated at an electrode is directly proportional to the quantity of electricity?.The above statement is associated with

• ANewton?s law
• BFaraday?s law of electromagnetic induction
• DGauss?s law

Explanation:

### 2.The charge required to liberate one-gram equivalent of any substance is known as ________  constant

• ATime
• CBoltzmann

Explanation:

The charge required to liberate one-gram equivalent of any substance is known as  Faraday?s constant.

### 3.The capacity of a cell is measured in

• AAmperes
• BAmpere - hour
• CWatts
• DWatt ? hours

Ampere - hour

Explanation:

The capacity of a cell is measured in Ampere - hour.

### 4.Active materials of a lead acid cell are

• CDilute sulfuric acid
• DAll of the above

All of the above

Explanation:

### 5.Sulphation in a lead-acid battery occurs due to

• AHeavy charging
• BFast charging
• CTrickle charging
• DIncomplete charging

Incomplete charging

Explanation:

Sulphation in a lead-acid battery occurs due to Incomplete charging.

### 6.The capacity of lead-acid cell does not depend on its

• ATemperature
• BRate of charge
• CRate of discharge
• DQuantity of active materials

Rate of charge

Explanation:

The capacity of lead-acid cell does not depend on its Rate of charge.

### 7.During charging the specific gravity of the electrolyte of a lead-acid battery

• AIncreases
• BDecreases
• CRemains the same
• DBecomes zero

Increases

Explanation:

During charging the specific gravity of the electrolyte of a lead-acid battery Increases.

### 8.The active materials on the positive and negative plates of a fully charged lead-acid battery are

• DNone of the above

Explanation:

### 9.When a lead-acid battery is in fully charged condition, the colour of its positive plate is

• BBrown
• CDark brown
• DNone of the above

Dark brown

Explanation:

When a lead-acid battery is in fully charged condition, the colour of its positive plate is Dark brown.

### 10.The active materials of nickel-iron battery are

• ANickel hydroxide
• BPowered iron and its oxide
• C21 % solution of KOH
• DAll of the above

All of the above

Explanation:

The active materials of nickel-iron battery are Nickel hydroxide, Powered iron and its oxide and 21 % solution of KOH.

### 11.The value of specific  Gravity of acid when a lead-acid battery is fully charged is

• A1.1
• B1.15
• C1.25
• D1.285

1.285

Explanation:

The value of specific  Gravity of acid when a lead-acid battery is fully charged is 1.285.

### 12.The ratio of ampere-hour efficiency to watt-hour efficiency of a lead-acid cell is

• AJust one
• BAlways greater than one
• CAlways less than one
• DNone of the above

Always greater than one

Explanation:

The ratio of ampere-hour efficiency to watt-hour efficiency of a lead-acid cell is Always greater than one.

### 13.The best indication about the state of charge on a lead-acid battery is given by

• AOutput voltage
• BTemperature of electrolyte
• CSpecific gravity of electrolytes
• DNone of the above

Specific gravity of electrolytes

Explanation:

The best indication about the state of charge on a lead-acid battery is given by Specific gravity of electrolytes.

### 14.The storage battery generally used in electric power station is

• BZinc-carbon battery
• DNone of the above

Explanation:

The storage battery generally used in electric power station is Lead-acid battery.

### 15.The output voltage of a charger is

• ALess than the battery voltage
• BHigher than the battery voltage
• CThe same as the battery voltage
• DNone of the above

Higher than the battery voltage

Explanation:

The output voltage of a charger is higher than the battery voltage.

### 16.Cells are connected in series in order to

• AIncrease the voltage rating
• BIncrease the current rating
• CIncrease the life of the cells
• DNone of the above

Increase the voltage rating

Explanation:

Cells are connected in series in order to  Increase the voltage rating.

• A1 V
• B1.5 V
• C1.75 V
• D2 V

2 V

Explanation:

### 18.The capacity of a battery is expressed in terms of

• ACurrent rating
• BVoltage rating
• CAmpere-hour rating
• DNone of the above

Ampere-hour rating

Explanation:

### 19.During the charging and discharging of a nickel-iron cell

• ACorrosive fumes are produced
• BWater is neither formed nor absorbed
• CNickel hydroxide remains upsplits
• DIts e.m.f remains constant

Water is neither formed nor absorbed

Explanation:

During the charging and discharging of a nickel-iron cell Water is neither formed nor absorbed.

### 20.As compared to constant-current system, the constant-voltage system of charging a lead acid cell has the advantage of

• AReducing time charging
• BIncreasing cell capacity
• CBoth (a0 and (b)
• DAvoiding excessive gassing