Allied & ICAR Exam Bank • ALLIED_0947 MCQ • 1 Mark

Section 6: Agricultural Process Engineering

Drying and Dehydration

Subtopic: Drying Theory and Grain Dryers

Question Statement:

The overall system drying efficiency $\eta_d$ of an indirect solar grain dryer is defined as:

Options:

  • (A) $\eta_d = \frac{m_w L_v}{I_t A_c t + E_{fan}}$ (ratio of energy used to evaporate moisture to total incident solar plus auxiliary fan energy)
  • (B) $\eta_d = \frac{I_t}{m_w}$
  • (C) $\eta_d = \frac{A_c}{m_w L_v}$
  • (D) $\eta_d = \frac{E_{fan}}{I_t}$

Answer Key:

A

Step-by-Step Solution & Explanation

Drying efficiency expresses the fraction of total energy input (incident solar irradiance on collector $I_t A_c t$ plus blower power $E_{fan}$) that actually performs useful water vaporization ($m_w L_v$).
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