Description : What are the purposes of barring gear?
Last Answer : Start rotor from rest. Eliminates sag in rotor - straighten and avoid rubbing at glands. Avoid direct contact journals and bearings. Avoid differential temp between top and bottom of cylinder due to convection of Steam or hot air inside turbine cylinders.
Description : A hand pump is usually fitted: a. For ground servicing purposes b. Lowering the landing gear in an emergency c. Pressurising the oleo struts in the air d. Retracting the gear after take-off
Last Answer : a. For ground servicing purposes
Description : What is the purpose of a turning gear?
Last Answer : Heat must be prevented from warping the rotors of large turbines or high-temperature turbines of 400°C or more. When the turbine is being shut down, a motor-driven turning gear is engaged to the turbine to rotate the spindle and allow uniform cooling.
Description : In accordance with Coast Guard Regulations (46 CFR), a steering gear feeder circuit from the emergency switchboard or alternate power supply must have the capacity for continuous operation of the rudder 15° side to side in not more than 60 seconds for a A. 1/4 hour B. 1/2 hour C. 1 hour D. 2 hours
Last Answer : Answer: B
Description : Coast Guard Regulations (46 CFR), require that an indicating light at the propulsion control station will operate if overloading or overheating occurs in a _______________. A. forced draft blower motor B. steering gear motor C. fuel pump motor D. condensate pump motor
Description : Coast Guard Regulations (46 CFR) require that lighting fixture globes must be protected by guards if the fixtures are located in the ____________. A. steering gear room B. galley C. living quarters D. wheelhouse
Last Answer : Answer: A
Description : According to Coast Guard Regulations (46 CFR), which of the following systems must be arranged so as to be energized by the final emergency power source? A. at least one light in the ... operated watertight door system C. each charging panel for temporary emergency batteries D. all of the above
Last Answer : Answer: D
Description : As shown in the illustrations, ordered rudder angle is fed back from the ________________. EL-0097 A. power unit to the magnetic amplifier B. steering gear to the control potentiometer C. magnetic amplifier to the steering gear D. rudder yoke to the non-followup controller
Description : When power is restored after a complete power failure, a steering gear pump motor will ____________. A. have to be restarted B. have to be reset C. restart automatically D. trip its overload relays
Last Answer : Answer: C
Description : An open-circuit fault between the pressure switch and the 'annunciator module' shown in the illustration would cause the alarm circuit to react in the same manner as if ___________. EL-0094 A. 3.5 ... below switch setting C. 50 PSI were applied to the 'setpoint module' D. the pressure switch closed
Description : If the steering stand selector switch is allowed to remain in the 'Non-Followup' mode after testing of the steering gear, the rudder will _____________. EL-0097 A. not respond to commands from the ... actuator D. stop moving only when the helm is counter-rotated to put the pump at neutral stroke
Description : What are the interlocks between 415 V and 6.6 kV switch gear?
Last Answer : 6.6 kV Breaker closed cannot rack in or out. Service lever cannot move while breaker closed. Breaker cannot be closed in in-between position. 415 V Breaker door cannot be opened when breaker is ... . Breaker cannot be closed in in-between position. Breaker closed cannot be rack in or out.
Description : What is requirement of speeder gear assembly?
Last Answer : To bring the turbine to synchronous speed and get tight lock with grid by grid frequency. BPC signal is given in Auto mode to the speeder gear motor.
Description : What are the logic’s adopted in barring gear motor?
Last Answer : For start permission a) Local or remote start. b) JOP is running. c) Motor hand barring is permissive. d) 42 contactor in MCC is off. e) Turbine speed is <100 rpm. Start permission (42S ... is >0.35 kg/ cm2. e) No thermal over load of 42. f) No one-DG condition.
Description : What is the type of brush used in brush gear?
Last Answer : Low co-efficient of friction and self-lubricating morganite grade carbon HM100. Now a day we are using LFC554 for economical reasons.
Description : How cooling is done for slip ring and brush gear?
Last Answer : A centrifuge fan is mounted on the shaft in between two slip rings for ventilation of the slip rings and brush gear.
Description : Why starting resistor is provided in barring gear motor?
Last Answer : Starting resistance at stator reduces voltage at stator terminals and accelerates the motor very slowly so as to allow smooth gear engagement. Other methods are a) Auto transformer. b) Star-delta starter.
Description : What is the function of speeder gear?
Last Answer : Speed raising beyond governor takeover speed upto full speed is achieved by raising and lowering the speeder gear.
Description : For practical purposes, in a simple series circuit, the source voltage will be dropped across one resistor if it has ______________. A. half the resistance of the other resistor B. a resistance equal to the other C. at least ten times the resistance of the other D. a partial short circuit
Description : Which of the following statements is true concerning a polyphase synchronous propulsion motor? A. The motor is started as an induction motor. B. Resistance is gradually added to the rotor circuit. C. ... is held below the rated current. D. The field winding is energized for starting purposes only.
Description : What are the purposes of cable trays?
Last Answer : a. Avoid sagging of cables b. Give mechanical support
Description : What type of governing system used in turbine and what are the purposes of the system?
Last Answer : Hydraulic governing system of centrifugal (speed) governer type is adopted in turbine. Sensitive oil pressure to actuate centrifugal governer is 6.1 kg/cm2 (max). At 6.7 kg/cm2 relief valve ... speeder gear from BPC signal. Once synchronised the grid frequency and speeder gear controls the speed.
Description : What are the purposes of bleed condenser?
Last Answer : The purposes of bleed condenser are, a. To cool the bleed water, which goes to bleed cooler. b. To provide cool hot water to the PHT purification system.
Description : For what purposes transformer ratio meter can be used?
Last Answer : Transformer ratio meter can be used for, a. To find the ratio of a transformer. b. To find the phase angle deviation of primary and secondary voltage of transformer. c. To find the magnitude of magnetizing currents.
Description : Mention the important parts of a power transformer and their purposes.
Last Answer : Conservator: This allows for shrinkage and swelling of transformer oil. When the oil is heated up it swells and rises to the conservator. When cools down it goes back to main tank. Conservator reduces sludge ... put. There are two types of tap changer. Online tap changer and off line tap changer.
Description : What are the purposes or advantages of transformer?
Last Answer : Purposes a. Electrical energy may be transmitted economically over long distance by stepping up of voltages to reduce the line losses. b. To distribute the low voltages at consumer side by stepping down ... There by efficiency is high and about 95 to 98%. b. Practically maintenance is very less.