Description : Which of the listed transformer uses a single winding to produce voltage transformation? A. Stepup transformers B. Stepdown transformers C. Autotransformers D. Isolation transformers
Last Answer : Answer: C
Description : The voltage at the reference electrode of the circuit shown in the illustration is applied to the input of a/an ______________. EL-0090 A. class A detector whose output drives an ... drives an 2-stage isolation transformer D. magnetic amplifier whose output controls a saturable reactor
Last Answer : Answer: D
Description : What is an isolation transformer?
Last Answer : A. An isolation transformer also referred to as insulating transformer, is one where the primary and secondary windings are separate.
Description : What is transformation ratio for step up, step down and isolation transformer?
Last Answer : K>1 for step up transformer K
Description : Calculated the noise figure of the amplifier whose Req equals 2518Ω (RT=600Ω) if its driven by a generator whose output impedance is 50Ω. A. 39.4 B. 3.94 C. 394 D. 0.394
Last Answer : A. 39.4
Description : Why Delta Star transformer Are Used For Lighting Loads?
Last Answer : For lighting loads, neutral conductor is must and hence the secondary must be star winding. and this lighting load is always unbalanced in all three phases. To minimize the current unbalance in the primary we use delta winding in the primary. So delta / star trformer is used for lighting loads.
Description : State two applications of isolation transformer
Last Answer : Applications of isolation transformer: i) Isolates the load equipment from supply ground: ii) Reduction of voltage spikes iii) It acts as a decoupling device. iv) Protects loads from harmonic distortion.
Description : What is an isolation transformer? State any two applications of isolation transformer.
Last Answer : i) Isolation transformers are specially designed transformers for providing electrical isolation between primary & secondary windings. The transformer has primary and secondary windings placed on the common core ... ground: ii) Reduction of voltage spikes iii) It acts as a decoupling device.
Description : Describe any two functions of Isolation transformer.
Last Answer : Function of isolation transformer: 1. Primary purpose of isolation transformer is to isolate the two circuits and not to step-up or step-down the voltage. 2. The ground connection ... secondary. 5. The isolation transformer reduces the transients of high amplitudes and short time interval
Description : List special features of isolation transformer with any four applications.
Last Answer : .embed-container { position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden; max-width: 100%; } .embed-container iframe, .embed-container object, .embed-container embed { position: absolute; top: 0; left: 0; width: 100%; height: 100%; }
Description : Explain construction and working of isolation transformer.
Last Answer : Isolation Transformer https://youtu.be/gq9kjLlhPN0
Description : function of equipment’s used in sub-stations : (i) Earth Switch (ii) Relay (iii) Lighting Arrester (iv) Auxiliary transformer
Last Answer : (i) Earth Switch It's function is to discharge the ground capacitance when line is open circuited for maintenance purpose by isolator.) Earthing switch is inter - locked with isolator from the safety point ... 3-ph, 4wire, 400V) to give supply to control room, area lighting, staff quarters etc,
Description : Explain energy conservation method in lighting system by using installation of separate transformer / servo stabilizer.
Last Answer : Energy conservation techniques by installation of separate transformer / servo stabilizer: The luminous efficiency of lamps depends upon the voltage applied across the terminals. It gives its best ... the voltage constant in that installation for giving best luminous efficiency of lamps.
Description : Induction generator a) can not work in isolation b) can work in isolation c) should work in parallel with synchronous generators d) any of the mentioned
Last Answer : Ans: C
Description : The device shown in the illustration is being used ________. EL-0083 A. in a step-down operation B. in a step-up operation C. in an isolation circuit D. as a filter
Last Answer : Answer: A
Description : The purpose of a short circuit forcing module (short time trip) installed in a branch line is to provide ____________. A. high speed clearance of low impedance short circuits in the branch B. ... C. isolation of short circuits by selective tripping of branch circuit breakers D. all of the above
Description : Why Isolation switches are provided along with the circuit breakers?
Last Answer : Isolation switches are provided for separating the disconnected element from the live portion of the system for the purpose of safety
Description : Why we need isolation transformers in power circuit ? why cant we use breakers to isolate?
Last Answer : In Isolation transformer is used, if there is change in parameter values of any side, the other side parameters will remain unchanged.
Description : What are isolation transformers?
Last Answer : In this type of transformer the primary and secondary are same. When it is required to isolate the primary and secondary circuits these type of transformers are used. It protects the circuits connected in secondary side when major fault occurs in primary side.
Description : When supplying emergency lighting loads, the storage battery initial voltage must not exceed the standard system voltage by more than _____________. A. 2% B. 3% C. 5% D. 10%
Description : According to Coast Guard Regulation (46 CFR) for emergency power and lighting systems, which of the listed items is the only permissible starting aid for the emergency diesel generator engine? A. Ether B. Lube oil heater C. Jacket water heater D. Fuel oil heater
Description : Which of the following statements is/are true regarding requirements for receptacle outlets aboard vessels? A. Each receptacle outlet operating at 100 volts or more must have a grounding pole. B. Outlets ... machinery with a portable light having a 50 foot flexible cord. D. All of the above.
Description : Which of the following statements of Coast Guard Regulations (46 CFR) concerning battery installations is correct? A. Sign, permanently secured to the battery trays, indicating that 'naked lights or smoking is ... on the bottom. D. Power and lighting batteries must be of the lead-acid type only.
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
Description : The source of emergency lighting and power at loss of normal ship's power on a cargo vessel should be obtained from the ______________. A. emergency generator supply to the emergency ... switchboard C. battery supply to the main switchboard D. turbogenerator supply to the emergency switchboard
Description : The purpose of the automatic bus transfer shown in the illustration is to ___________. EL-0014 A. stepdown voltage to the lighting distribution panel B. provide emergency power to ... emergency switchboard from the main switchboard D. provide overcurrent protection to the lighting distribution panel
Last Answer : Answer: B
Description : The electrical schematic shown in the illustration indicates the lighting feeder circuit is _____________. EL-0014 A. three phase, 450 volt, and 60 cycle B. three phase, 120 volt, and 60 cycle C. single phase, 120 volt, and 60 cycle D. not specified
Description : In the lighting distribution circuit shown in the illustration, if all switches are closed and fuse 'F2' were to open, all lights on branches ____________. EL-0013 A. '1', '2', and '3' would go out B. '1' ... and '3' would burn dimly D. '1' and '3' would go out, while branch '2' would remain lit
Description : If the voltage supplied to the lighting circuit is 110 volts, how much current is used by a 100 watt light bulb? A. 0.08 amps B. 0.91 amps C. 1.10 amps D. 90.9 amps
Description : In the illustration if BRANCH NO. 1 is a lighting circuit for crew's berthing, Federal Regulations (46 CFR) require the maximum fuse rating for that branch to be _________. EL-0013 A. 80% of the connected load B. 15 amps C. 20 amps D. 30 amps
Description : In the illustration if BRANCH NO. 1 is a lighting circuit for crew's berthing, 46 CFR requires the maximum fuse rating for that branch to be _________. EL-0013 A. 15 amps B. 80% of the connected load C. 20 amps D. 30 amps
Description : If the illustrated lighting branch distribution box is not for cargo or deck lighting, the Coast Guard Regulations (46 CFR) requires the designed load attached to Branch NO.2 to be no more than _________. EL-0013 A. 5 amps B. 16 amps C. 30 amps D. 50 amps
Description : Federal Regulations (46 CFR) require the circuit in the illustration to _________. EL-0009 A. be at the vessel's ship's service generator distribution switchboard for normal power, normal lighting ... ground will interfere with the operation of electronic equipment D. All the above are correct
Description : In the illustrated one line diagram, if the turbo generator fails, the diesel generator_________. EL-0014 A. will automaticly start and supply power to the emergency power switchboard, the power ... be manually started but once running will supply power to the lighting main through the ABT.
Description : The devices labeled 'L' in the illustration are _________. EL-0003 A. load lights indicating that the generator breaker is closed and the generator is supplying power to the main bus B. ... o'clock position the lights are at their dimmest or out indicating the the generators are in phase
Description : Due to the operating characteristics of the system, time lag fuses (or dual-element fuses) are necessary for use in _____________. A. main lighting circuits B. motor starting circuit C. emergency lighting circuits D. general alarm circuits
Description : Transformers are used onboard ships with AC generators to _____________. A. change frequency B. increase power output to modulating frequency controllers C. decrease power output to modulating frequency ... D. permit higher voltage for electric motor operation and low voltage for lighting circuits
Description : Handheld phase sequence indicators are useful when ________. A. preparing to parallel alternators B. connecting lighting branch circuits C. troubleshooting DC motors D. connecting shore power lines to the ship
Description : Which of the following components are used to assemble a fluorescent lighting system? A. Lamp B. Starter C. Ballast D. All of the above
Description : Time delayed or delayed action-type fuses are designed to _____________. A. prevent grounds in branch circuits B. prevent opens in motor circuits C. permit momentary overloads without melting D. guard lighting and electronic circuits
Description : A delayed-action fuse is most frequently used in which of the listed circuits? A. Lighting circuit B. Motor circuit C. Electric heater circuit D. Radar circuit
Description : Which of the listed types of lighting circuits does the diagram shown in the illustration represent? EL-0081 A. High pressure sodium B. Low voltage quartz C. Mercury vapor D. Standard fluorescent
Description : The diagram shown in the illustration represents a _________. EL-0058 A. dual speed, 2-winding motor controller B. navigation running light circuit C. single phase, 2-motor selectable starter D. common fluorescent lighting circuit
Description : Where should the lighting arrestor is placed in distribution lines?
Last Answer : Near distribution transformers and out going feeders of 11kv and incoming feeder of 33kv and near power transformers in sub-stations.
Description : Why Delta Star Transformers are used for Lighting Loads?
Last Answer : A. For lighting loads, neutral conductor is must and hence the secondary must be star winding.This lighting load is always unbalanced in all three phases. To minimize the current unbalance in the primary we use delta winding in the primary. So delta / star transformer is used for lighting loads.
Description : Where should the lighting arrestor be placed in distribution lines?
Last Answer : A:Near distribution transformers and out going feeders of 11kv and incomming feeder of 33kv and near power transformers in sub-stations.
Description : Where are the lighting arrestors placed in distribution lines?
Last Answer : Near distribution transformers and outgoing feeders of 11kv and incoming feeder of 33kv and near power transformers in sub-stations.
Description : What types of lighting fittings are used in the battery room?
Last Answer : Flame proof acid resistant
Description : What are the lighting systems adopted in KGS?
Last Answer : There are two systems. a. Normal lighting with class IV power supply. b. Emergency lighting with class II power supplies and in control room with class I power supplies.
Description : What are the types of lighting?
Last Answer : a. Direct lighting: light directly comes from the source to the surface. b. Indirect lighting: light reflects from the wall, reflector or ceilings etc. c. Semi direct lighting: light comes through the shade.