Power Engineering B Exam Questions And Verified Answers

Power Engineering B Exam Questions And Verified Answers Q.the voltage required to be supplied to a 12 kW motor drawing 24 A is: - ANSWERS-500 V Q.The right hand rule for generators is used to: - ANSWERS-Determine direction of induced current flow Q.The equivalent resistance of three resistances of 10, 25 and 50 omps connected in parrallel is _____ omps - ANSWERS-6.25 Q.Transformers are rated in: - ANSWERS-kVA Q.A rheostat is also known as - ANSWERS-A variable resistor Q.Three major lossed which occur in a transformer are iron losses, copper losses. And ________ - ANSWERS-Flux leakage Q.An operating current transformer should never: - ANSWERS-Have its secondary circuit opened first Q.A 120/208 V system is best described as a - ANSWERS-Three phase four-wire system Q.The best type of diagram for showing supply and distribution system is the ____ diagram - ANSWERS-One-Line Q.The outlut voltage of a shunt DC generator is varied by adjusting the: - ANSWERS-Feild rheostat Q.Watt meters measure - ANSWERS-True watts Q.Transmitters that transmit digital codes directly to a computer are known as: - ANSWERS-Smart transmitters Q.If during the pilot trial for ignition period, the pilot does not ignite, a lockout will occur - ANSWERS-If the trial for ignition period has lasted approimately 15 to 30 seconds Q.The primary function of a programming control is to: - ANSWERS-Start or stop a burner following a safe sequence Q.A control valve that has one plug that moves upward to close the port is called: - ANSWERS-Reverse acting single ported. Q.A process computer connected to digital inputs is protected from harmful voltages by means of: - ANSWERS-Isolating circuit ( disconnects) Q.A float operated level control: - ANSWERS-Is only used on small boilers Q.A process variable which is adjusted in order to maintain or achieve some desired value of another variable is termed the: - ANSWERS-Manipulated variable Q.A helix strip bimetallic thermometer is wound spirally to: - ANSWERS-Amplify the motion of the pointer Q.When the pressure pointer of a closed system altitude gaige reads lower than the altitude pointer the: - ANSWERS-System requires water Q.Thye feedwater pipe before entering the boiler must contain: - ANSWERS-A check valve with a stop valve between the check valve and the boiler Q.The scale on the dial of the pressure or altitude gauge on a hot water heating boiler shall be graduated to not more than _____ temes the pressure at which the safety relief valve is set. - ANSWERS-3.5 Q.After a steam heating system has been operating for some time, you notice that some parts of the heating system are still cold. What could be the cause? - ANSWERS-Air is trapped in the affected sections Q.Is quartz tube heater a gas-fired infrared heater? - ANSWERS-No its not. Q.Activated carbon will absorb odours and objectionable gases by up to _____ of its own weight before requiring replacement. - ANSWERS-20% Q.Ome of the main considerations in the construction of radiators suitable for steam heating systems is: - ANSWERS-Large heating surface area Q.Diverter fittings are used in the supply lines to heating units when: - ANSWERS-A higher hearing output is required from the heating unit