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 APRIL/MAY 2026. ME3491-THEORY OF MACHINES PART A-(10x220 marks) 1. State the significance of velocity and acceleration polygons. 2. Sketch any two inversions of a double slider crank chain. 3. Distinguish between a simple gear train and an epicyclic gear train. 4. Sketch out the configuration of a reverted gear train. 5.What are the various types of belts used for the transmission of power?  6.Give two examples for antifriction bearings.  7. List any two examples for applied and constrained forces. 8. State D' Alembert's principle. 9. What do you mean by dynamic balancing? 10. What are the causes and effects of vibrations? PART B-(5x13= 65 marks) 11.(a). PQRS is a four-bar chain with link PS fixed. The lengths of the links are PQ = 62.5 mm: QR = 175 mm, RS = 112.5 mm,; and PS = 200 mm. The crank PQ rotates at 10 rad/s clockwise. Draw the velocity and acceleration diagram when angle QPS = 60° and Q and R lie on the same side of PS. Find the angular velocity and angular ac...

  APR-MAY 2026 OBT356-LIFESTYLE DISEASES AU QP PART A (10 x 2=20 marks) 1. Define obesity. Obesity is a chronic medical condition characterized by an excessive or abnormal accumulation of body fat that poses a risk to health, typically clinically defined by a Body Mass Index (BMI) of \(30kg/m2) or higher.   2. Mention two types of diabetes mellitus. Ø   Type 1 Diabetes: An autoimmune disorder where the immune system destroys insulin-producing pancreatic cells, causing an absolute insulin deficiency. Ø   Type 2 Diabetes: A metabolic disorder characterized by insulin resistance, where the body's cells fail to respond effectively to insulin.   3. State biomarkers. Biomarkers (biological markers) are objectively measured, quantifiable indicators of a biological state, pathogenic process, or pharmacological response to a therapeutic intervention (e.g., blood glucose or cholesterol levels).   4. List any two causes of lung cancer. Ø   Tobacco Smoking: The pr...