Description : What does the torque switch mechanism senses to operate?
Last Answer : Torque switch senses whether the torque of motor has exceeded the set point irrespective of position of valve.
Description : The winch shown in the illustration will not operate in any speed in the lowering direction and at an abnormal speed in 'first point hoist'. The possible cause is that _______________. EL-0102 A. ... '1M' in the power circuit are badly corroded D. master switch contacts 'MS6' have weak springs
Last Answer : Answer: B
Description : A single-phase induction motor will only start if you spin the rotor rapidly with the line switch closed. After starting, its speed fluctuates between very slow and half-speed. The problem ... in the ________. A. starting winding B. centrifugal mechanism C. centrifugal switch D. running winding
Last Answer : Answer: D
Description : A single-phase induction motor fails to start. The rotor is spun rapidly with the line switch closed. Having started by this method it is noted that the motor fluctuates between a very slow ... lies in the ______ A. starting winding B. centrifugal mechanism C. centrifugal switch D. running winding
Description : As shown in the illustration, the symbol is used in electrical drawings to designate a ____________. EL-0026 A. limit switch with one set of normally open contacts B. maintaining type ... type push button with a mechanical interlock D. normally closed contact held open mechanically by an interlock
Last Answer : Answer: C
Description : The purpose of the 'heater resistors' for the winch circuit shown in the illustration is to _______________. EL-0102 A. limit the current in the heater circuit B. dispel moisture in the ' ... panel C. keep the winch brake housing below the dew point D. maintain winch motor operating temperature
Description : Indicate how you will select the limit switch contacts for indication and for cutting the supply to the motor?
Last Answer : For cutting off the supply to the motor normally closed (NC) contacts of limit switch (LS) should be wired in series with interposing relay coil of respective direction of the valve so that when ... should remain NC only and vice-versa. So for close direction NC contact of close direction
Description : Explain the operational aspects of limit switch and torque switch in rotork valve actuator.
Last Answer : a. When limit function is selected? b. When torque function is selected? Limit function - when limit function is selected in rotork valve, the limit switches will operate when the limit set ... . The limit switches will not act (only torque switch will act when selected to torque function).
Description : Do you require separate limit switch for closing and separate limit switch for opening?
Last Answer : Ans. YES.
Description : As shown in the illustration, a 'pitch cutback' feature is incorporated in the system. This circuit reduces pitch amount to prevent engine overload when it senses ____________. EL-0095 A. pitch error of ... servo' C. excessive propeller speed or fuel to either engine D. only one engine on the line
Description : Which component of seed drill is used for transmit power to operate seed dropping mechanism. a) Frame b) Transport wheel c) Seed box d) Covering device
Last Answer : Transport wheel
Description : Why would my multi-speed fan switch operate at reverse strength?
Last Answer : Perhaps in the strange fashion of fans the speed directly after off is the highest, then the rest are respectively slower. And they simply numbered them 0–4 for aesthetic purposes?
Description : What is the difference between a switch and a hub? A. Switches operate at physical layer while hubs operate at data link layer B. Switches operate at data link layer while hubs operate at ... hubs operate at physical layer D. Switches operate at transport layer while hubs operate at physical layer
Last Answer : C. Switches operate at data link layer while hubs operate at physical layer
Description : If the ignition switch is placed in the ON position and all the engine instruments operate properly except the gas gauge, where would the fault probably be?
Last Answer : Between point (3) and the gas gauge tank unit ground.
Description : I can't figure out how to wire the thermostat, transformer, fan/limit switch, and an electrical cut off (to pilot light) in my 1945 Armstrong Furnace. Help!
Last Answer : You may wish to talk to an electrical contractor, if you need to be up to code. Where I live, it would not be legal for the layman to do this kind of work. Your laws may vary, but it’s worth checking them out.
Description : If an electrical heater has three heating elements connected in parallel why does each element have its own fusible link and limit switch?
Last Answer : What is the answer ?
Description : Consider the statement which is followed by two arguments (I) and (II): Statement: Should India switch over to a two party system? Arguments: (I) Yes, it will lead to stability of Government. (II) No, ... (II) is strong; (C) Both the arguments are strong. (D) Neither of the arguments is strong.
Last Answer : (C) Both the arguments are strong.
Description : Draw the symbol and state the applications of : 1) Push button switch 2) Selector switch 3) Solenoid valve 4) Limit switch
Last Answer : 1) Push Button It is used in start-stop control circuit 2) Selector Switch : It is used to select one input out of many, 3) Solenoid valve: is used to control flow of fluid such as air, pressurized oil. 4) Limit switch: It is used to detect presence of object
Description : In accordance with Coast Guard Regulations (46 CFR), a circuit breaker located in the machinery space and installed in a 440V AC system must _____________. A. be dependent upon mechanical ... the maximum asymmetrical shortcircuit current available at the point of application D. all of the above
Description : Which of the following statements is a requirement of Coast Guard Regulations (46 CFR) concerning emergency diesel generator engines? A. The fuel must have a flash point not less than 75°F. B. ... to each side of the vertical. D. The starting battery must produce 12 consecutive cranking cycles.
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 : Which of the listed motors will operate at the highest RPM, assuming that each operates at the same frequency? A. A four-pole synchronous motor under normal load. B. A four-pole induction motor under ... A six-pole synchronous motor under normal load. D. A six-pole induction motor under full load.
Last Answer : Answer: A
Description : Universal motors will operate on AC or DC current, and are generally found in _____________. A. portable tools B. large pump motors C. turbo electric main motors D. forced draft fans
Description : A four-pole induction motor, operating on three-phase 60 cycle current will operate at approximately ___________. A. 850 RPM B. 1,150 RPM C. 1,750 RPM D. 3,550 RPM
Description : If the energy input is significantly reduced to the prime mover of one shipboard alternator operating in parallel with others, that alternator will _____________. A. continue to operate at no load B. lose ... overspeed C. begin to motorize and then trip out D. slow down and operate at reduced load
Description : If field excitation is suddenly lost to an alternator operating in parallel, that alternator will _____________. A. supply excessive current to the bus B. operate at the same load, but with reduced voltage C. lose its load and tend to overspeed D. become overloaded and slow down
Description : In the illustrated motor controller circuit, which statment is true? EL-0023 A. The high and low speed lights operate at less than line voltage with a resistor in series. B. This controller can be ... . The wattage of the high speed light must be greater than the wattage of the low speed light.
Description : If there is a reduction in the normally supplied frequency to a 120/240 volt, threephase AC current motor from 60 hertz to 55 hertz, the motor would _____________. A. run at a slower speed B. operate at a lower current C. overheat D. trip off the line
Description : How long after energizing 'ATMX' at '41Y' shown in the illustration do the contacts of 'ATM' operate? EL-0100 A. 3 minutes B. 27 minutes C. 30 minutes D. 33 minutes
Description : If many turns of an alternating current coil for a contactor become short circuited, the coil _____________. A. will continue to operate B. will probably burn out immediately C. will operate on reduced current D. temperature will drop
Description : Modern handheld digital tachometers operate by counting light pulses returned to the unit by ______________. A. the tach generator B. either the coupling or shaft C. a small bulb attached to the shaft D. a piece of reflective tape
Description : Why is it desirable to operate paralleled AC generators at the same power factor? A. Circulating currents are kept to a minimum. B. Field excitation losses are kept to a minimum. C. Generator ... will have a lesser tendency to hunt. D. Because a power factor increase will decrease kilowatt output.
Description : Power necessary to operate the horn relay shown in the illustration ____________. EL-0093 A. comes from each station's magneto B. is supplied from a 115 volt source C. is conducted through the relay's contacts D. also lights lamps 'R' and 'T'
Description : As load is added to a shunt motor, the motor will _________. A. speed up B. continue to operate at the same speed C. slow down slightly D. stop
Description : If many turns of an alternating current coil for a contactor become short circuited, the coil _____________. A. temperature will drop B. will probably burn out immediately C. will continue to operate D. will operate on reduced current
Description : Shunt, series, and compound wound motors, are all DC motors designed to operate from _____________. A. constant potential, variable current DC sources B. variable potential, constant current DC ... C. variable potential, variable current DC sources D. constant potential, constant current DC sources
Description : Power necessary to operate the horn shown in the illustration _____________. EL-0093 A. comes from each station's magneto B. is supplied from a 115 volt source C. is conducted through a relay coil D. also lights lamps 'R' and 'T'
Description : How many different D.C. voltages are required to operate the circuit shown in the illustration? EL-0094 A. Two B. Three C. Four D. Five
Description : On AC vessels, which of the following statements represents the most difficult problem involved in obtaining a DC potential suitable for use by computer components? A. A stepdown transformer is ... voltage must be rectified and made ripple free. D. Rectifiers cannot operate with voltage regulators.
Description : Which type of AC single-phase motor will also operate on direct current? A. Split-phase B. Series-wound C. Shaded-pole D. Repulsion-start
Description : Which of the following statements is true concerning all three-phase alternators? A. Each has three separate but identical armature windings acted on by one system of rotating magnets. B. Each has one ... The three phases always provide power to the load through three sets of slip rings and brushes.
Description : The purpose of the capacitor within component 'B' of the circuit shown in the illustration is to ____________. EL-0081 A. prolong the life of the component's contacts B. discharge the neon within ... the inductive reactance in the circuit D. store power to operate the circuit should 'D' open
Description : Which of the following conditions will occur if the solenoid coil burns out on a cargo winch with an electrical brake? A. The brake will be set by spring force. B. The motor will overspeed and burn ... the cargo boom will fall. D. Nothing will happen; the winch will continue to operate as usual.
Description : Brushless generators are designed to operate without the use of ___________. A. brushes B. slip rings C. commutators D. all of the above
Description : Why do cylindrical Alternators operate with steam turbines?
Last Answer : A: Steam turbines are found to operate at fairly good efficiency only at high speeds. The high speed operation of rotors tends to increase mechanical losses and so the rotors should have a ... axial length are used for Synchronous generators driven by steam turbines with either 2 or 4 poles.
Description : Will rotor earth fault relay operate for earth fault in main exciter winding or RCU Diode Bridge also?
Last Answer : Yes.
Description : How will you proceed to operate the valve manually after an electrical operation?
Last Answer : After electrical operation to operate manually we must tilt the lever provided on the actuator to hand (manual) position by which the sliding clutch gets engaged with hand drive.
Description : What is the function of hammer blow mechanism?
Last Answer : Hammer blow mechanism allows motor to rotate freely for ½ or ¼ turn and the dog teeth on worm gear comes against the dog teeth on sliding clutch with a blow. This is use full when valve is stuck in fully open or closed condition.
Description : Of the 5 senses of sight,hearing,taste,smell and touch,what is your one must have in choosing a mate?
Last Answer : Hearing. It’s the quickest way to find out what he’s really like.