4th Class Certificate Power Engineering Part B 1&2 Merged Exam Questions Complete With Verified Answers

4th Class Certificate Power Engineering Part B 1&2 Merged Exam Questions Complete With Verified Answers Q.A prime mover is a) an electric motor b) a steam turbine c) a centrifugal pump d) an air compressor e) a boiler - ANSWERS-b Q.Large power production plants tend to be of the thermal type because they can burn solid fuels and: a) they are the least expensive to build b) the noise level is much less than internal combustion engines c) the heat cycle they use is the most efficient d) solid fuels are the most plentiful and cheapest e) require the least amount of manpower - ANSWERS-c Q.Whenever feasibly possible, when checking bearings on running pieces of equipment it is wise to a) check the oil quality leaving each b) check the oil quantity leaving each c) get accustomed to normal running temperature and vibration by feel d) smell the normal odors of the running bearing e) observe the temperature on a thermometer - ANSWERS-c Q.One of the first ways to detect a fault in a reciprocating engine is a) by sound b) temperature indication c) performance efficiency d) by oil consumption e) by smell - ANSWERS-a Q.A steam turbine's exhaust can often supply a process with steam because a) processes always require a lower steam pressure b) processes never require the high steam temperatures turbines do c) turbine exhaust steam is always dry and saturated d) it is free of oil e) the steam will be at a temperature above the initial temperature - ANSWERS-d Q.The exhaust steam from a steam turbine is more acceptable for process than the exhaust from a steam engine because a) it is much hotter b) it is easily controlled c) it is free of oil d) it is free of moisture e) it contains more condensate - ANSWERS-c Q.Turbines often have segmental carbon ring sealing glands which are held in place by a) labyrinths b) shrouding c) drive screws d) garter springs e) thrust runners - ANSWERS-d Q.A steam turbine should trip or shut down when normal operating speed is exceeded by a) 250 RPM b) 3 to 5% c) 50 RPM d) 10 to 15% e) 25 RPM - ANSWERS-d Q.Condensing turbines a) are always impulse turbines b) will have a vacuum in the last row of rotating blades c) will use the condensate for heating d) are very small units e) cannot have counter-flow stages - ANSWERS-b Q.Which turbine uses a condenser? a) back pressure turbine b) a turbine exhausting to a vacuum c) a bleeder turbine exhausting at atmospheric pressure d) a non-condensing extraction turbine e) a turbine exhausting to atmosphere - ANSWERS-b Q.The shrouding installed on the blading of a steam turbine serves to: a) cool the blade tips b) expand the steam c) stop the steam flow d) heat the steam e) confine the steam to the blades - ANSWERS-e Q.The turbine over speed trip: 1. prevents the turbine from vibrating 2. prevents the turbine exceeding the maximum rated speed 3. is operated by a spring loaded pin in the rotating blades 4. will close the steam stop valve 5. should be tested before the turbine is placed in service a) 2, 4, 5 b) 2, 3, 4, 5 c) 1, 2, 4 d) 3, 4, 5 e) 4, 5 - ANSWERS-a Q.The over speed trip of a steam turbine a) operates on turbine vibrations due to high speed b) is installed on all turbines c) can be adjusted according to the load demand d) is regulated by exhaust pressure e) sheds the load in the event of high pressure - ANSWERS-b Q.Turbine over speed trip a) prevents the turbine from vibrating b) will close the steam stop valve to the turbine c) is operated by a spring loaded pin in the rotating blades d) supplies the operator with rpm indications e) reduces the turbine speed by increasing the back pressure - ANSWERS-b