Why the COP for heat pump is more than the COP of refrigeration? Note that the COP of a heat pump depends on its duty. The heat rejected to the hot sink is greater than the heat absorbed from the cold source, so the heating COP is 1 greater than the cooling COP. How do […]
What is the effect of compression ratio on efficiency of Otto cycle?
What is the effect of compression ratio on efficiency of Otto cycle? As the compression ratio increases, the fuel mixture is sufficiently compressed thereby increasing the thermal efficiency, so that less fuel is required to produce the same amount of energy. Fuel consumption is reduced at higher compression ratios between 8 and 9. What is […]
What is point point control?
What is point point control? The point-to-point (PTP) control system is many times referred to as the positioning system. The primary function of the PTP control system is to move a tool from one point location to another specified point, generally to do hole operations such as drilling, boring, reaming, tapping and punching. What is […]
What is the effect of global warming on agriculture?
What is the effect of global warming on agriculture? Climate change can affect agriculture in a variety of ways. Beyond a certain range of temperatures, warming tends to reduce yields because crops speed through their develop- ment, producing less grain in the process. And higher tem- peratures also interfere with the ability of plants to […]
What are the different types of mounting?
What are the different types of mounting? Types of Mounting Methods Plate Type. Holes for mounting a caster are provided on the mounting base. Screw-in Type. Since a thread is provided on the stem, mount a caster by screwing the caster on the stem. Insertion Type(Rubber Pipe Type) Angle Type. Dedicated wrenches for mounting casters. […]
What does coping saw mean?
What does coping saw mean? : a handsaw with a very narrow blade held under tension in a U-shaped frame and used especially for cutting curves in wood. What is the difference between a coping saw and a hacksaw? Usage. The coping saw blade is installed with the teeth pointing towards the handle. Unlike a […]
What happens when energy is added to ice?
What happens when energy is added to ice? Changing states of matter and energy When heat (a form of energy) is added, the ice melts into liquid water. If heat is removed from water vapour, the gas cools down and it condenses back into liquid water. Continue to cool the water (by removing heat), and […]
Does a heat engine that has a thermal efficiency of 100 percent?
Does a heat engine that has a thermal efficiency of 100 percent? Heat engines often operate at around 30% to 50% efficiency, due to practical limitations. It is impossible for heat engines to achieve 100% thermal efficiency () according to the Second law of thermodynamics. Does a heat pump violate the second law of thermodynamics? […]
How do you control pump cavitation?
How do you control pump cavitation? Some tips to prevent cavitation due to vaporization include: NPSHa > NPSHr + 3 ft or more safety margin. Lower temperature. Raise liquid level in suction vessel. Change out pump type. Reduce motor RPM. Use impeller inducer. Increase diameter of the eye of impeller. How cavitation occurs in pump? […]
What are the advantages of up milling?
What are the advantages of up milling? Advantages of Conventional Milling (Up Milling): The width of the chip starts from zero and increases as the cutter finishes slicing. The tooth meets the workpiece at the bottom of the cut. Upward forces are created that tend to lift the workpiece during face milling. What is Climb […]