## electrical

### Electrolysis and Storage Batteries MCQ With Answers Page - 4

1.
 Under normal charging rate, the charging current should be A 10 % of capacity B 28 % of capacity C 30 % of capacity D 40 % of capacity Answer : A Explanation :
2.
 A generator has an open-circuit e.m.f of 180 V. its terminal voltage drops to 150 V with a load resistance of 10 kΩ. What is the internal resistance? A 200 Ω B 2 KΩ C 20 KΩ D 200 KΩ Answer : B Explanation :
3.
 When two batteries are connected in parallel, it should be ensure that A They have same of e.m.f B They have same make C They have same ampere-hour capacity D They have identical internal resistance Answer : A Explanation :
4.
 A typical output of solar cell is A 0.1 V B 0.26 V C 1.1 V D 2 V Answer : B Explanation :
5.
 Petroleum jelly is applied to the electrical connections the lead-acid battery to A Prevent local heating B Prevent short circuiting C Reduce path resistance D Prevent corrosion Answer : D Explanation :
6.
 When the load resistance equals the generator resistance which of the following will be maximum? A Current B Efficiency of the circuit C Power in the load resistance D Voltage across the load resistance Answer : C Explanation :
7.
 The common impurity in the electrolyte of a lead-acid battery is A Chlorine B Dust particle C Lead crystals D Iron Answer : D Explanation :
8.
 What is the reasonable value of the current that can be continuously drawn from a 120 ampere-hour capacity lead-acid cell? A 2 A B 20 A C 40 A D 70 A Answer : C Explanation :
9.
 In a lead acid battery, the energy is stored in the form of A Charged iron B Chemical energy C Electrostatic energy D Electromagnetic energy Answer : B Explanation :
10.
 Which among the following constitute the major load of an automobile battery? A Brake light B Self-starter C Parking light D Spark plug Answer : B Explanation :
11.
 Which of the following factor adversely affects the capacity of the lead acid battery? A Temperature of surroundings B Specific gravity of electrolyte C Rate of discharge D All of the above Answer : D Explanation :
12.
 Cells are connected in parallel to A Increase the efficiency B Increase the current capacity C Increase the voltage output D Increase the internal resistance Answer : B Explanation :
13.
 The current in a chemical cell is movement of A Positive ions B Positive and negative ions C Negative ions only D Positive-hole charges Answer : B Explanation :
14.
 A constant-voltage generator has A Minimum efficiency B Minimum current capacity C Low internal resistance D High internal resistance Answer : C Explanation :
15.
16.
 Satellite power requirement is provided through A Solar cells B Dry cells C Nickel cadmium cells D Lead-acid batteries Answer : A Explanation :
17.
 If a battery is to be charged at a much higher rate as compared to normal charging rate, the charging should be restricted one A 95% of the capacity of battery B 80% of the capacity of battery C 55% of the capacity of battery D 35% of the capacity of battery Answer : B Explanation :
18.
 For preparing electrolyte for lead acid battery, acid is poured into water to A Avoid explosion B Make initial mixture too weak C Conserve consumption of acid D Avoid generation of excess heat Answer : D Explanation :
19.
 In a lead-acid battery, separators are provided to A Reduce internal resistance B Facilitate flow of current C Reduce tendency for polarisation D Avoid internal short circuits Answer : D Explanation :
20.
 In a lead-acid battery fillers are provided A To recover acid loss through vapours B To prevent flow of gases C To facilitate flow of gases D All of the above Answer : C Explanation :
21.
 In a lead-acid battery during charging A Specific gravity of acid increases B Voltage drops C Anode becomes whitish in colour D The cell gives out energy Answer : A Explanation :
22.
 A floating battery is one A Which gets charged and discharged simultaneously B Which supplies current intermittently and also during off the cycle get charged C In which battery voltage is equal to charger voltage D In which the current in the circuit is fully supplied by the battery Answer : B Explanation :
23.
 It is normally specified by the manufactures that a lead-acid battery should not remain discharged for more than A One hour B 24 hours C One weak D One month Answer : B Explanation :
24.
 Three cells are connected in series to from a battery. The internal resistance is 0.1 Ω each. The internal resistance of the battery is A 0.1 Ω B 0.2 Ω C 0.3 Ω D 0.6 Ω Answer : C Explanation :
25.
 The life of a lead-acid battery is expected to be A Two months B One year C Two to five years D Ten to fifteen years Answer : C Explanation :
26.
 Tickle charge is required for A Primary cells B Lead-acid batteries C Nickel-iron cells D All of the above Answer : D Explanation :
27.
 In case of a lead-acid battery a wet battery cover indicates A Over filling of the battery B Excessive gassing during charging C Leaky seals at covers D Any of the above Answer : D Explanation :
28.
 The electrolyte in a Leclanche cell is A Pyrogallic acid B Lead stearate C Dilute sulphuric acid D Aqueous solution of ammonium chloride Answer : D Explanation :
29.
 A lead-acid battery, even when not in use, should be recharged once in A Ten days B Three weeks C Six weeks D Six month Answer : C Explanation :
30.
 Sedimentation in lead-acid batteries occurs due to A Slow charging at low price B Overcharging at high rate C Non-utilization for longer periods D Over discharging at slow rate Answer : B Explanation :
31.
 The terminal voltage, when the battery is being charged, decreases with A Increasing temperature B Increasing charging rate C Increasing state of charge D All of the above Answer : A Explanation :
32.
 Which test is used to ascertain whether the battery plates are defective or not? A Open circuit test B Cadmium test C High discharge test D Sp. Gravity test Answer : B Explanation :
33.
 12 V lead-acid battery has an internal resistance of 0.01 Ohm. How much current will flow when the battery is short-circuited? A 10 A B 100 A C 600 A D 1200 A Answer : D Explanation :
34.
 Which of the following is a dry storage cell? A Carbon-zinc cell B Mercury cell C Nickel-iron D Nickel-cadmium cell Answer : D Explanation :
35.
 Two batteries having unequal e.m.f. A Can be connected in series only B Cannot be connected in series C Cannot be connected in parallel D May be connected in series or in parallel Answer : A Explanation :
36.
 Which of the following materials is used in solar cells? A Barium B Silicon C Silver D Selenium Answer : B Explanation :
37.
 In a lead-acid cell, hydrogen is liberated at A Positive plates B Negative plate C Both positive and negative plates D None of the plates Answer : B Explanation :
38.
 Find the odd one out A Lead-acid cell B Solar cell C Fuel cells D Dry cells Answer : B Explanation :
39.
 The efficiency of a solar cell may be in the range A 2 to 5% B 10 to 15 % C 70 to 80 % D 30 to 40 % Answer : B Explanation :
40.
 A battery is made up of 5 voltage cells in series. Each cell has an open circuit of e.m.f. of 1.6 v and an internal resistance of 0.08Ω. What is the battery terminal voltage for a load of 6 Ω? A 5 V B 6 V C 7 V D 7.5 V Answer : D Explanation :