एक स्पार्क प्रज्वलन इंजन में संपीडन अनुपात 8 है और संपीडन से पहले आयतन 0.9 m3/kg है। प्रति चक्र शुद्ध ऊष्मा अंतःक्रिया 1575 kJ/kg है। तो औसत प्रभावी दबाव क्या है?

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  1. 20 kPa
  2. 20 bar
  3. 2000 Pa
  4. 2 bar

Answer (Detailed Solution Below)

Option 2 : 20 bar
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ST 1: UPSC ESE (IES) Civil - Building Materials
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Detailed Solution

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संकल्पना:

संपीडन अनुपात = \(r = \frac{{volume\;before\;compression\;}}{{volume\;after\;compression}}\)

किया गया कार्य = औसत प्रभावी दबाव × घुमा हुआ आयतन

घुमा हुआ आयतन = (v1 – v2)

Capture   111 5

गणना:

दिया गया संपीडन अनुपात (r) = 8, v1 = 0.9 m3/kg, शुद्ध ऊष्मा अंतःक्रिया = 1575 kJ/kg

किसी चक्र के लिए, शुद्ध ऊष्मा अंतःक्रिया =शुद्ध कार्य अंतःक्रिया

\(r = \frac{{{v_1}}}{{{v_2}}}\)

⇒  \({v_2} = \frac{{0.9}}{8} = 0.1125\frac{{{m^3}}}{{kg}}\)

किया गया कार्य = औसत प्रभावी दबाव × घुमा हुआ आयतन (v1 – v2)

∴ 1575 × 103 = pm × (0.9 – 0.1125)

pm = 20 bar

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