1. The maintenance concept delineates :
 A) The anticipated levels of maintenance, general overall repair policies, the organization responsibilities for maintenance, the major elements of logistic support, the effectiveness requirements associated with the maintenance environment.
 B) The anticipated levels of maintenance, general overall repair policies, the organization responsibilities for maintenance, the major elements of logistic support, the effectiveness requirements associated with system support and the maintenance special tools and test equipment.
 C) The anticipated levels of maintenance, general overall repair policies, the organization responsibilities for maintenance, the maintenance facilities, the effectiveness requirements associated with system support and the maintenance special tools and test equipment.
 D) The anticipated levels of maintenance, general overall repair policies, the organization responsibilities for maintenance, the major elements of logistic support, the effectiveness requirements associated with system support and the maintenance environment.

Solution : D.
Although there are some variations as a function of the nature and type of system, the maintenance concept generally includes the following information.

1. Level of maintenance. (Organizational maintenance, Intermediate maintenance, Depot, supplier, or manufacturer maintenance)
2. Repair policies. (An item should be designed to be nonrepairable, partially repairable, or fully repairable)
3. Organizational responsibilities. (The accomplishment of maintenance may be the responsibilty of the customer, the producer, a third party, or a combination.)
4. Maintenance support elements. (These elements include supply support - spares and repair parts, associated inventories, provisioning data, test and support equipment, personnel and training, transportation and handling equipment, facilities, data, and computer resources.)
5. Effectiveness requirements. (These constitute the effectiveness factors associated with the support capability such as spare part demand rate and so on,)
6. Environment. (Defintion of the environment as it pertains to maintenance and support.)
*Source : Benjamin S. Blanchard, Logistics Engineering, Sixth Ed, Prentice-Hall, 2004, pp140-145.

2. Tactual displays
 A) Presume that all pats of the human hand have equal sensitivity.
 B) Optimize the capabilities of the human cutaneous (or somesthetic) senses.
 C) Depend on the human olfactory senses.
 D) Have greater effectiveness and utility at lower temperatures.

Solution : B.
In every life, human depend on their cutaneous (or somesthetic or skin) senses much more than they realize. Tactual displays have been most extensively used as substitutes for seeing - as extension of our eyes.
*Source : J. W. Langford, Logistics : Principles and Applications, McGraw-Hill, 1995, p141 - 142.

3. The aggregate probability of occurrence of the individual events that creates a specific hazard is termed as :
 A) Hazardous event probability.   B) Hazard probability.
 C) Design risk.                 D) Hazard severity.

Solution : C.
Hazard probability : The probability that a hazard will be created during the planned life expectancy the system can be described in terms of potential occurrences per unit of time, event, population, item, or activity.
*Source : J. W. Langford, Logistics : Principles and Applications, McGraw-Hill, 1995, p174.

4. Availability is a function of :
 A) Reliability and Supportability.   B) Reliability and Maintainability.
 C) Reliability and Failure Rate.     D) Reliability and Reliability Apportionment.

Solution : B.
Availability is the measure of the readiness of a system to fulfill its assigned function. Whereas reliability defines the probability of a system's successfully completing its operational mission after having been engaged, availability, as a preengagement indicator, measures the capability of a system to be committed to operation. Availability is sensitive to and determined by the trade-off between system reliability and maintainability.
*Source : J. W. Langford, Logistics : Principles and Applications, McGraw-Hill, 1995, p71

5. When dealing with Human Factors in Systems consideration must be given to the following factors :
 A) Human sensory, anthropometic, physiological and psychological.
 B) Human sensory, environmental, physiological and psychological.
 C) Human sensory, anthropometic, physiological and physical.
 D) Human sensory, anthropometic, safety and psychological

Solution : A.
The governing human considerations in the design of human-machine systems include strength and endurance ; speed and accuracy; the senses of tough, sight, hearing, and smell; and body movements.
*Source : J. W. Langford, Logistics : Principles and Applications, McGraw-Hill, 1995, p129 - 133.

6. The ____________________distribution is continuous and can be used for increasing or decreasing failure rates.
 A) Exponential    B) Poisson.
 C) Weibull.       D) Hypergeometric.

Solution : C.
The failure distribution for mechanical items may be different from that for electronic components. In many instances, the Weibull distribution may be more realistic. The Weibull distribution that is one of continuous distribution can be applied to increasing or decreasing failure rates.
*Source : Benjamin S. Blanchard, Logistics Engineering, Sixth Ed, Prentice-Hall, 2004, pp48.

7.____________________ = MTBM/(MTBM + MDT)
 A) Operational availability.   B) Inherent availability.
 C) Achieved availability.     D) Normal availability.

Solution : A.
Operational availability measures the readiness of a system in its actual operational environment. The parameter mathematically consolidates mean time between maintenance (MTBM) and maintenance downtime (MDT).
*Source : J. W. Langford, Logistics : Principles and Applications, McGraw-Hill, 1995, pp71 - 83.
<제공> www.SOLE.org/이승현(lkangsan@iems.co.kr)
<문의> 02)461-1770 e-mail : info@sole.or.kr