⚙️ Steam Nozzles and Turbines MCQs with Live Score

Practice 100 important steam nozzles and turbines MCQs with answers and detailed explanations

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Question 1: In a steam power plant, why is a convergent-divergent nozzle preferred over a simple convergent nozzle for achieving maximum exit velocity under high pressure ratios?

Question 2: In steam nozzle flow under choked conditions, what happens to mass flow rate when back pressure is reduced below the critical pressure ratio?

Question 3: In a convergent-divergent steam nozzle, at which section does the steam velocity first reach the speed of sound under ideal expansion conditions?

Question 4: Why is a divergent section necessary in a steam nozzle designed for supersonic flow in high-pressure applications?

Question 5: In an impulse steam turbine, how is the energy transfer from steam to the rotor blades primarily achieved?

Question 6: What is the condition for maximum mass flow through a steam nozzle?

Question 7: In a simple impulse turbine, the pressure of steam across the moving blades:

Question 8: Degree of reaction for a pure impulse turbine is:

Question 9: In a reaction turbine, steam expansion takes place in:

Question 10: Why is compounding used in steam turbines?

Question 11: In velocity compounding of impulse turbines, pressure drop occurs in:

Question 12: What is the function of fixed blades in a reaction turbine?

Question 13: In a steam nozzle, friction losses result in:

Question 14: The efficiency of a steam nozzle is defined as:

Question 15: In impulse turbine blades, the shape is designed to:

Question 16: In a convergent steam nozzle, maximum velocity is achieved at:

Question 17: What happens to steam pressure as it flows through a nozzle?

Question 18: In an impulse turbine, blade efficiency depends mainly on:

Question 19: The function of a nozzle in a steam turbine is to:

Question 20: In a reaction turbine, degree of reaction is defined as:

Question 21: In steam turbines, blade speed ratio is defined as:

Question 22: Maximum efficiency of impulse turbine occurs when blade speed is:

Question 23: In a steam nozzle, if friction increases, exit velocity will:

Question 24: In an impulse turbine, steam leaves the blade with:

Question 25: The velocity of steam at nozzle exit depends mainly on:

Question 26: In a reaction turbine, moving blades act as:

Question 27: What is the main disadvantage of impulse turbine?

Question 28: In steam turbine, mechanical efficiency is defined as:

Question 29: In a nozzle, if back pressure is higher than critical pressure, flow will be:

Question 30: The primary reason for using compounding in turbines is to:

Question 31: In a convergent-divergent nozzle, when back pressure is exactly equal to critical pressure, the flow condition at throat is:

Question 32: In a steam nozzle, increase in inlet pressure while keeping outlet pressure constant will result in:

Question 33: The function of a steam turbine governor is to:

Question 34: In an impulse turbine, the maximum efficiency occurs when blade speed ratio is approximately:

Question 35: In a reaction turbine stage, degree of reaction equal to 0.5 indicates:

Question 36: In steam turbines, compounding is necessary mainly due to:

Question 37: In a nozzle, if steam expansion is not isentropic, the efficiency will:

Question 38: In a reaction turbine, pressure drop per stage is generally:

Question 39: In impulse turbine blades, steam velocity relative to blade decreases because:

Question 40: The exit angle of blades in impulse turbine is designed to:

Question 41: In a nozzle, maximum discharge occurs when:

Question 42: In reaction turbine, steam velocity increases in:

Question 43: In a steam nozzle, the expansion process ideally follows:

Question 44: In a Parsons reaction turbine, degree of reaction is:

Question 45: The work done in a turbine depends on:

Question 46: In a nozzle, the velocity of steam increases due to:

Question 47: In impulse turbine, losses occur mainly due to:

Question 48: The main advantage of reaction turbine over impulse turbine is:

Question 49: In a nozzle, the area increases in divergent section to:

Question 50: Steam turbines are mainly used for:

Question 51: In a convergent-divergent nozzle, if exit pressure is higher than design pressure, the flow will be:

Question 52: The dryness fraction of steam affects nozzle performance because:

Question 53: In an impulse turbine, pressure across moving blades remains:

Question 54: In a reaction turbine, steam expands in:

Question 55: Blade velocity coefficient is defined as:

Question 56: In steam turbines, reheat is used to:

Question 57: In a nozzle, the maximum velocity is achieved when expansion is:

Question 58: In a steam turbine, mechanical efficiency is defined as:

Question 59: In an impulse turbine, the optimum blade speed is proportional to:

Question 60: In a reaction turbine, degree of reaction depends on:

Question 61: If nozzle efficiency decreases, exit velocity will:

Question 62: In compounding of turbines, pressure compounding is used to:

Question 63: In velocity compounding, total pressure drop occurs in:

Question 64: In reaction turbines, blade passages act as:

Question 65: In a steam nozzle, friction causes:

Question 66: In impulse turbine, blade efficiency depends on:

Question 67: In a reaction turbine, flow is:

Question 68: In a nozzle, critical pressure ratio depends on:

Question 69: In turbines, stage efficiency is defined as:

Question 70: In a nozzle, if back pressure is reduced below critical value, flow velocity at throat:

Question 71: In a steam turbine, overall efficiency is product of:

Question 72: In a nozzle, mass flow rate depends on:

Question 73: In turbines, losses occur due to:

Question 74: In a reaction turbine, velocity triangles are used to determine:

Question 75: In steam turbines, blade height increases towards last stages because:

Question 76: In a convergent-divergent nozzle, shock waves may form when:

Question 77: In a steam turbine, the reheat factor is defined as:

Question 78: In a reaction turbine, axial thrust is produced due to:

Question 79: In impulse turbine, if blade friction increases, efficiency will:

Question 80: In steam nozzles, superheated steam is preferred because:

Question 81: In a turbine stage, the work done is maximum when:

Question 82: In a convergent nozzle, maximum velocity achieved is:

Question 83: In impulse turbine compounding, the purpose is to:

Question 84: In a reaction turbine, the relative velocity at exit is less than inlet due to:

Question 85: In steam turbines, condenser is used to:

Question 86: In a nozzle, stagnation enthalpy remains:

Question 87: In turbines, leakage losses occur due to:

Question 88: In impulse turbine, pressure drop occurs in:

Question 89: In a reaction turbine, pressure drop is:

Question 90: In steam turbines, governing is done to:

Question 91: In nozzle flow, Mach number at throat is:

Question 92: In reaction turbine, work is done due to:

Question 93: In steam turbines, wet steam causes:

Question 94: In a nozzle, enthalpy drop is converted into:

Question 95: In turbines, efficiency is maximum when losses are:

Question 96: In a nozzle, expansion ratio is defined as:

Question 97: In steam turbines, superheating increases:

Question 98: In a reaction turbine, velocity diagram is used for:

Question 99: In turbines, blade angles are designed to:

Question 100: In a steam turbine, maximum efficiency is achieved when:

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⚙️ Steam Nozzles and Turbines MCQs with Live Score

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