HI Gradians,
You have completed the syllabus of the RVUNL exam for RAC. Now BYJU'S Exam Prep brings you the 100 most important questions of the RAC subject.
Here you will find the 100 most important questions for the RAC subject of the Mechanical Engineering syllabus. The top 3 questions are attached here rest questions you can find in the below pdf.
PDF OF 100 MOST IMPORTANT QUESTIONS OF RAC
1. Which one of the following is used to measure the heat transfer size of the heat exchanger?
A. Effectiveness B. NTU
C. LMTD D. Overall heat transfer coefficient
Ans. B
2. In unsteady-state conduction for bodies with negligible temperature gradients, the time
temperature variation curve is ___________.
A. linear B. parabolic
C. sinusoidal D. exponential
Ans. D
Thus, in unsteady-state conduction for bodies with negligible temperature gradients, the time-temperature variation curve is exponential.
3. There are two bodies A and B, the ratio of their thermal conductivities is KA/KB=15, the ratio of their densities ρA/ρB=3/2 and the ratio of their specific heats cA/CB = 4, then the ratio of
their thermal diffusivities αA/αB will be ________.
A. 1.5 B. 2.5
C. 3.5 D. 4.5
Ans. B
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