Power Engineering 4A - Test Review 1 Questions and Answers Already Passed

Power Engineering 4A - Test Review 1 Questions and Answers Already Passed The main component of any computer is the: Select one: a. Central processing unit b. Memory c. Screen d. Keyboard A Which of the following statements about steam distributing heating coils is true? Select one: a. The coils are freeze-proof b. The coils distribute steam evenly over the entire coil c. The coils are used when steam cannot be throttled d. The coils cannot be used where freezing air temperatures are frequently encountered over the coil e. The coils can only have same end connections B In order to ensure safe and continuous operation of a pressure reducing valve, the valve station should have _________________. Select one: a. A safety valve on the high-pressure side b. A bypass line, plus a safety valve and pressure gauge on the low-pressure side c. Thermometers on the inlet and outlet piping d. A strainer immediately downstream of the valve B In the water cycle, respiration and transpiration are: Select one: a. physical reactions b. metaphysical functions c. biological functions d. mammalian reactions C If an electrical _____ is placed across a conductor, the electrons will drift from the negative end towards the positive end of the conductor. Select one: a. Potential b. Current c. Resistance d. Wire A ________ provide easy assembly and dismantling of screwed piping connections. Select one: a. Bolts b. Flanges c. Unions d. Couplings C The letters LAL inside a circle on a P&ID stands for : Select one: a. Level alarm low b. Level glass c. Level recorder d. Level alarm high A If a body travels 850m in 34 seconds, what will its average velocity be, in km/h? Select one: a. 25 b. 900 c. 90 d. 215 C One disadvantage of using threaded connections to join pipes and fittings is that it: Select one: a. difficult to insulate b. Requires the services of a pipe fitter c. is more costly d. Weakens the pipe D A boiler furnace releases 10 400 kJ of heat for each kg of fuel burned and produces dry saturated steam at 14 000 kPa abs. from feedwater at 200°C. How many kg of steam will be produced for each kg of fuel burned if the boiler has an efficiency of 66%? Select one: a. 3.546 b. 3.845 c. 4.875 d. 5.754 e. 6.854 B A block and tackle system has 3 pulleys in each of two blocks. If a downward effort of 100 N is applied and the machine has an efficiency of 83.6%, what is the maximum mass that can be lifted? Select one: a. 501.6 kg b. 51.1 kg c. 5113.1 kg d. 250 kg B Unit heaters differ from convectors