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AEIS Chap 1 Mst Revision (Answers)

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AEIS Chap 1 Mst Revision (Answers)
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  1. On the aircraft, the battery is normally charged by  ____________________    *a. constant voltage method. b. either constant voltage or constant current method. c. constant current method   d. neither constant voltage nor constant current method.   2. Which of the following is not a symptom of thermal runaway?   *a. Current surge. b. Violent gassing.   c. Boiling electrolyte   d. Melting of plates and casing.   3. Which of the following is used to determine the terminal voltage of battery cells when the battery is under load?   a. Hydrometer   *b. High rate discharge test   c. Capacity test d. Insulation test   4. For a charged lead acid battery, what is the chemical reaction residue at the positive plate?   *a. Lead peroxide   b. Lead sulphate   c. Lead   d. Sulphur   5. For a discharged lead acid battery, what is the chemical reaction residue at the positive plate?   a. Lead peroxide   *b. Lead sulphate   c. Lead   d. Sulphur   6. Which of the following is not the principal function of the aircraft batteries?   *a. To maintain the d.c system voltage throughout flight.   b. To maintain the d.c system voltage under transient conditions.    c. To supply power for short term heavy loads when generator or ground power is not available.   d. To supply limited amounts of power to essential flight instruments, radio communication equipment under emergency conditions.   7. Which of the following statement is true about the battery? *a. To convert chemical energy into electrical energy.   b. To convert mechanical energy into electrical energy.   c. To convert electrical energy to mechanical energy.   d. To convert electrical energy into chemical energy.   8. What is the function of a storage battery during normal operation of aircraft?   a. Generate 400 Hz. AC through the inverter.   b. Power all indicators in cockpit during night flight   *c. Use as auxiliary power when generator operation is not satisfactory.   d. Keep ATC communication system powered.   9. What is the correct construction detail of a 24V lead-acid battery?   *a. Consists of 12 cells in series   b. Consists of 6 cells in series.   c. Consists of 12 cells in parallel.   d. Consists of 18 cells in parallel.   10. What should be the change in specific gravity of the electrolyte in nickel-cadmium battery from fully discharged to fully charged condition?   a. 1.240 to 1.260   b. 1.260 to 1.280   c. 1.280 to 1.30   *d. The specific gravity does not indicate the state of charge in the case of nickel-cadmium cell   11. What is meant by useful life of a secondary battery?   a. It is equal to ampere-hour.   b. It is equal to number of charge-discharge cycles times ampere-hour.   *c. It is equal to number of charge-discharge cycles before its capacity is reduced to uneconomical level.    d. It is equal to the number of years of operation before the fully charged voltage drops to 90% of the voltage of a new battery.   12. How to measure insulation resistance of a battery?   *a. Measure between positive terminal of battery and metal plate that is in contact with metal fittings of the battery   b. Measure between negative terminal of battery and metal plate that is in contact with metal fittings of the battery   c. Measure between shorted positive and negative terminals of battery and metal plate that is in contact with metal fittings of the battery   d. Measure between positive terminal of battery and electrolyte inside battery.   13. What is the minimum acceptable insulation resistance for an aircraft battery?   *a. Should be at least 0.5 Mega ohms.   b. Should be greater than 5 Mega ohms.   c. Should be at least 5000 ohms.   d. Should be greater than 5 Giga ohms.   14. In order to eliminate cell imbalance in Ni-Cd batteries, we should completely discharge cells and recharge. What is the name of this method?   *a. Capacity reconditioning method   b. Constant voltage charging method.   c. Constant current charging method.   d. Power charging method.    1. When charging current is applied to a nickel-cadmium battery, the cells emit gas only   a. when the electrolyte level is low.   b. if the cells are defective.   *c. toward the end of the charging cycle.   d. when the battery casing cracks. 2. What part of a nickel-cadmium cell helps to prevent thermal runaway?   *a. The separator.   b. The negative plate.   c. The positive plate.   d. The casing.   3. If the insulation resistance of a lead/acid battery is down, it indicates   *a. case leakage.   b. leakage between positive and negative terminals.   c. intercell leakage.   d. All the above answers.   4. The electrolyte level of a ni-cad battery a. falls during charge. *b. falls during discharge. c. rises during discharge. d. may rise or fall during discharge. Incorrect Answer Reply: The electrolyte level of a nicad battery falls during discharge (but the s.g. remains constant).   5. A 24V 40AH battery discharges at 200mA. How long will it last? a. 400 hours. b. 300 hours. *c. 200 hours. d. No answer. Incorrect Answer Reply: 200mA goes into 1A-5 times. 5 * 40 = 200 hours.   6. The internal resistance of a battery off load compared to on load is *a. the same.

159189E.pdf

Jul 23, 2017
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