Concept explainers
The material often used to manufacture electric strip heater coils is ____.
The material which is used for the manufacturing of electric strip heater coils.
Answer to Problem 1RQ
The material which is used for the manufacturing of electric strip heater coils is Nichrome.
Explanation of Solution
An electric heater is a heat producing device. In an electric heater there is a conversion of electric energy into the heat energy. Heat is being produced by the resistance of the material which is connected in an electric circuit. The materials being used in an electric heater should have high electric resistance and must be a good conductor of heat and electricity. It should also possess a high melting point. Since the heat is produced at an elevated temperature in the heating element. Hence it should have a property to withstand at such high temperature. Generally, a nichrome wire is used in an electric heater for the purpose of heating. Nichrome is an alloy of Nickel and Chromium. It also possesses good mechanical strength. Therefore, it is better option for using it in an electric heater.
Conclusion:
Nichrome is used to manufacture electric strip heater coils due to its good properties which are desired for the perfect heating coils.
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Chapter 30 Solutions
Refrigeration and Air Conditioning Technology (MindTap Course List)
- 5: The structure shown was designed to support a30-kN load. It consists of a boom AB with a 30 x 50-mmrectangular cross section and a rod BC with a 20-mm-diametercircular cross section. The boom and the rod are connected bya pin at B and are supported by pins and brackets at A and C,respectively.1. Calculate the normal stress in boom AB and rod BC,indicate if in tension or compression.2. Calculate the shear stress of pins at A, B and C.3. Calculate the bearing stresses at A in member AB,and in the bracket.arrow_forward4: The boom AC is a 4-in. square steel tube with a wallthickness of 0.25 in. The boom is supported by the 0.5-in.-diameter pinat A, and the 0.375-in.-diameter cable BC. The working stresses are 25ksi for the cable, 18 ksi for the boom, and 13.6 ksi for shear in the pin.Neglect the weight of the boom.1. Calculate the maximum value of P (kips) based on boom compression and the maximum value of P (kips) based on tension in the cable.2. Calculate the maximum value of P (kips) based on shear in pin.arrow_forward3: A steel strut S serving as a brace for a boat hoist transmits a compressive force P = 54 kN to the deck of a pier as shown in Fig. STR-08. The strut has a hollow square cross section with a wall thickness t =12mm and the angle θ between the strut and the horizontal is 40°. A pin through the strut transmits the compressive force from the strut to two gusset plates G that are welded to the base plate B. Four anchor bolts fasten the base plate to the deck. The diameter of the pin is 20mm, the thickness of the gusset plates is 16mm, the thickness of the base plate is 8mm, and the diameter of the anchor bolts is 12mm. Disregard any friction between the base plate and the deck.1. Determine the shear stress in the pin, in MPa and the shear stress in the anchor bolts, in MPa.2. Determine the bearing stress in the strut holes, in MPa.arrow_forward
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