Briefly describe two methods that are used in lubricating motors.
What will be an ideal response?
Methods of lubricating motors include the following:
• Small motors with sleeve bearings have oil holes with spring covers.
• The bearings of larger motors are often provided with an oil ring that fits loosely in a slot in the bearing. The oil ring picks up oil from a reservoir located directly under the ring.
• Many motors are lubricated with grease.
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The plant engineer for a large foundry has been asked to calculate the thermal efficiency of the generating plant used by the company to produce electricity for the aluminum melting furnaces. The plant generates 545.6 GJ of electrical energy daily. The plant burns 50 t (tons) of coal a day. The heat of combustion of coal is about 6.2 × 10^6 J/kg (joules/ kilogram). What was the answer? (Efficiency = W/Jheat)
What will be an ideal response?
¿Cuántos bloques de revestimiento biselados de 3 pulgadas (7,62 cm) se necesitan para cubrir un tanque de 36 pulgadas (91,44 cm) de diámetro (incluido el aislamiento) y 36 pulgadas (91,44 cm) de largo?
a. 24 b. 38 c. 48 d. 93
Which of the following would not require the use of satellite technology?
A) live United States television coverage of a newsworthy event in the Middle East B) a facsimile being sent from the United States to Great Britain C) a telephone conversation between Jan and her mother, who live on opposite sides of Detroit D) none of the above requires satellite technology
The symbol ____ is used in electronics to represent voltage.
A. V B. C C. W D. E