City Guilds Model Questions Vol1 2024 Engineering Question 19

Practice objective / multiple choice question 19 from the 2024 City Guilds Model Questions Vol1 Engineering examination.

City Guilds Model Questions Vol1 2024 Engineering Objective / Multiple Choice Hard Difficulty
Question 19 CITY_GUILDS_MODEL_QUESTIONS_VOL1 • 2024 • ENGINEERING • objective

A system consists of two components A and B arranged in series. Component A has a mean time between failures (MTBF) of 200\,h and a mean time to repair (MTTR) of 5\,h; component B has MTBF = 300\,h and MTTR = 8\,h. The system availability is the product of the availabilities of the two components. Management can either (i) reduce the MTTR of component A by 2\,h or (ii) reduce the MTTR of component B by 2\,h. Assuming all other parameters remain unchanged, which option yields the greater increase in system availability? Compute the new system availability for each option and state the preferred option.

Answer Options

A. Option (i) is better; new availability = \\frac{15000}{15600} \\approx 0.9615 (increase \\approx 0.0115).
B. Option (ii) is better; new availability = \\frac{15000}{15631} \\approx 0.9597 (increase \\approx 0.0097).
Correct Answer C. Option (i) is better; new availability = \frac{15000}{15631} \approx 0.9597 (increase ≈ 0.0097).
D. Option (i) is better; new availability = \\frac{14900}{15631} \\approx 0.9535 (increase \\approx 0.0035).
Correct Answer
C
Correct Option:
Option (i) is better; new availability = \frac{15000}{15631} \approx 0.9597 (increase ≈ 0.0097).

About This Question

This is City Guilds Model Questions Vol1 2024 Engineering Question 19. It is one of the objective questions from the 2024 City Guilds Model Questions Vol1 Engineering examination.

Difficulty level: Hard .

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