1. Your firm sells backup generators to hospitals and clinics. The generators are guaranteed to operate on demand for two years. Your data show that the generators run an average of 42 hours per year. Your firm offers an extended warranty that covers the next three years. Your data show that repairs are needed for 2 percent of units during this three-year period. When repairs […]

62. Through which structures does the electrical signal that produces contraction travel once it is initiated by the heart’s pacemaker? A. Sinoatrial node, sinoatrial bundle, atrioventricular node, atrioventricular bundle, left and right bundle branches B. Atrioventricular node, atrioventricular bundle, sinoatrial node, Purkinje fibres, left and right bundle branches C. Sinoatrial node, atrioventricular node, atrioventricular bundle, left and right bundle branches, Purkinje fibres D. Atrioventricular node, […]

(i) A reversible heat pump is designed to maintain a temperature of _1 _C in a refrigerator. It rejects heat to surroundings at 27 _C. If the heat removal rate is 1500 kJ/m. Calculate the COP of the machine and the input work required. (ii) If the required input to run the pump is developed by a reversible engine which receives heat at 377 _C […]

16. Through which valve does blood flow when it moves from the left atrium into the left ventricle? A. The semilunar valve B. The mitral valve C. The tricuspid valve D. The aortic valve 17. Which period of the heart cycle is completely occupied by the ventricles contracting? A. Atrial systole B. Atrial diastole C. Ventricular systole D. Ventricular diastole

A thick piston is initially held in a cylinder by a pin as shown in Fig.1.39. Assume that the cylinder contains carbon dioxide at 220 kPa and take ambient temperature as 300 K. The density of the piston is 8000 kg/m3. Assume atmospheric pressure as 100 kPa. If the pin is removed then the piston will move up. Assume that after a while the gas […]

Small and medium pressures are measured by (a) barometer (b) mercury manometer (c) pressure gauge (d) water or alcohol manometer Choose the correct answer. (a) manometers are suitable for high pressure measurements (b) manometers are used for recording pressures (c) manometers requires very little maintenance (d) manometers are compact and sturdy

Refer the manometer shown in Fig.1.44, having bulbs A and B containing water (_ = 1000 kg/m3) at different pressures. These bulbs are connected to two mercury manometers. The open end of the manometers are connected by an inverted U-tube manometer containing oil (_o = 875 kg/m3). Calculate the pressure difference between the bulbs A and B in kPa. Take the density of mercury as […]

63. Where is the “apex” of the heart? A. It is in the right atrial wall. B. It is the most inferior part of the left ventricle. C. It is the start of the aorta. D. It is below the atria and between the two ventricles. 64. What is another name for the tricuspid valve of the heart? A. Left atrioventricular valve B. Right atrioventricular […]

In an aqueous electrolytic cell, nitrate ions never react at the anode, but nitrite ions do. Explain. How does overvoltage influence the products in the electrolysis of aqueous salts? In the electrolysis of molten NaBr: (a) What product forms at the anode? (b) What product forms at the cathode? In the electrolysis of molten Ba: (a) What product forms at the negative electrode? (b) What […]

What is the distinction between a weak-field ligand and a strong-field ligand? Give an example of each. Is a complex with the same number of unpaired electrons as the free gaseous metal ion termed high spin or low spin? Why are there both high-spin and low-spin octahedral complexes but only high-spin tetrahedral complexes?