আর্কিটেকচার
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পদার্থ বিজ্ঞান
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রসায়ন
15 chapters
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গণিত
4 chapters
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ইংরেজি
11 chapters
Technical
Architecture
9 chapters
Questions
0 read · 0 practiced · 0 answered in examsSeries components থাকলে overall efficiency সাধারণত কী?
Correct answer: a
Series energy conversions-এ overall efficiency η1×η2×...।
দুটি component-এর efficiency 80% ও 90% হলে overall efficiency কত?
Correct answer: a
Overall η=0.80×0.90=0.72 বা 72%。
একটি machine-এর MA=4 ও VR=5 হলে efficiency কত?
Correct answer: a
η=MA/VR×100=4/5×100=80%。
একটি machine-এর load 500 N ও effort 100 N হলে MA কত?
Correct answer: a
MA=load/effort=500/100=5।
Effort 2 m এবং load 0.5 m সরলে VR কত?
Correct answer: a
VR=effort distance/load distance=2/0.5=4।
MA=3 এবং VR=4 হলে efficiency কত?
Correct answer: a
η=3/4×100=75%。
একটি machine-এর efficiency 50% হলে input 1000 J-এ output কত?
Correct answer: a
Output=0.50×1000=500 J।
Output 900 J ও loss 100 J হলে input কত?
Correct answer: a
Input=output+loss=900+100=1000 J।
Input 2000 J ও loss 500 J হলে efficiency কত?
Correct answer: a
Output=1500 J; efficiency=1500/2000×100=75%。
Power input 10 kW ও useful output 8 kW হলে efficiency কত?
Correct answer: a
Efficiency=8/10×100=80%。