Discussion
Heating \( 500 \) kg of grain of specific heat \( 1.6 \) kJ/kg K from \( 15 \) to \( 45 \) degrees Celsius requires
Answer: B
Correct answer: 24.0 MJ
Sensible heating is mass times specific heat times temperature rise:
\[ Q = mc\Delta T = 500 \times 1.6 \times (45 - 15) \]
\[ Q = 500 \times 1.6 \times 30 = 24\,000\ \mathrm{kJ} = 24.0\ \mathrm{MJ} \]
Because only a temperature difference appears, degrees Celsius and kelvin are interchangeable here and no conversion is needed - a 30 degree rise is a 30 kelvin rise. This figure is the sensible heat alone; a real drier must also supply the latent heat of the water evaporated, which is much the larger term.
No comment is present. Be the first to comment.
Loading…
Post your comment
Please log in or register to post a comment.
Examination Categories
- SSC Exams
- Banking Exams
- Teaching Exams
- Civil Services Exams
- Railways Exams
- Engineering Recruitment Exams
- Defence Exams
- State Government Exams
- Police Exams
- Insurance Exams
- Nursing Exams
- Other Government Exams
- NRA CET
- PG Entrance Exams
- Campus Placement
- MBA Entrance Exams
- CUET and UG Entrance
- Judiciary Exams
- Regulatory Body Exams
- Software Development