City Guilds Model Questions Vol1 2020 Engineering Question 18

Practice objective / multiple choice question 18 from the 2020 City Guilds Model Questions Vol1 Engineering examination.

City Guilds Model Questions Vol1 2020 Engineering Objective / Multiple Choice Hard Difficulty
Question 18 CITY_GUILDS_MODEL_QUESTIONS_VOL1 • 2020 • ENGINEERING • objective

A steel workpiece of length \(150\) mm and initial diameter \(50\) mm is to be turned to a final diameter of \(48\) mm. Two machines are available:\n\nMachine A: cutting speed \(V=60\) m/min, feed \(f=0.2\) mm/rev, depth of cut \(d=2\) mm.\nMachine B: cutting speed \(V=80\) m/min, feed \(f=0.15\) mm/rev, depth of cut \(d=1.5\) mm.\n\nAssuming a belt efficiency of 95%, calculate for each machine (i) the material removal rate (MRR) in mm³/min, (ii) the machining time for the single pass, and (iii) which machine provides the higher MRR and by what percentage it exceeds the other.

Answer Options

A. Machine A has MRR ≈ 21000 mm³/min, Machine B ≈ 18000 mm³/min; Machine A's MRR is about 16.7% higher. Both machining times ≈ 2.10 min.
B. Machine A has MRR ≈ 24000 mm³/min, Machine B ≈ 18000 mm³/min; Machine B's MRR is about 33.3% higher. Both machining times ≈ 1.96 min.
Correct Answer C. Machine A has MRR ≈ 24000 mm³/min, Machine B ≈ 18000 mm³/min; Machine A's MRR is about 33.3% higher. Both machining times ≈ 1.96 min.
D. Machine A has MRR ≈ 24000 mm³/min, Machine B ≈ 20000 mm³/min; Machine A's MRR is about 20% higher. Both machining times ≈ 1.96 min.
Correct Answer
C
Correct Option:
Machine A has MRR ≈ 24000 mm³/min, Machine B ≈ 18000 mm³/min; Machine A's MRR is about 33.3% higher. Both machining times ≈ 1.96 min.

About This Question

This is City Guilds Model Questions Vol1 2020 Engineering Question 18. It is one of the objective questions from the 2020 City Guilds Model Questions Vol1 Engineering examination.

Difficulty level: Hard .

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