Regarding the Morse test used for determining indicated power of multi-cylinder I.C. engines, which of the following statements is/are CORRECT?
Options:
(A) The engine is run at a constant rated speed throughout the test
(B) When one cylinder is cut out, the reduction in brake power equals the indicated power of that cut-out cylinder
(C) The frictional power of each cylinder is assumed to remain unchanged when that cylinder is cut out
(D) The Morse test is suitable for both multi-cylinder SI and CI engines
Answer Key:
A, B, C, D
Step-by-Step Solution & Explanation
1. Engine speed must be maintained constant using a governor or dynamometer adjustment. (A is correct)
2. $\text{IP}_k = \text{BP}_{\text{all}} - \text{BP}_{\text{without } k}$. (B is correct)
3. Frictional and pumping losses are assumed constant at that invariant speed. (C is correct)
4. By shorting spark plugs (SI) or cutting off fuel injection lines (CI), the test works on both engine classes. (D is correct)
All statements A, B, C, D are correct.