Description : A rheostat differs from potentiometer in the respect that it?
Last Answer : A rheostat differs from potentiometer in the respect that it has higher wattage rating.
Description : When the input and output wipers of a balanced potentiometer are in the same angular position, what is the value of the error voltage?
Last Answer : Zero.
Description : Are there any differences between fire hydrants and fire department connections?
Last Answer : Fire hydrants are essential when it comes to putting out fire by the fire department. Fire hydrants are connected to a large water supply through underground pipes. When firefighters arrive on the scene, ... , it opens a valve deep underground that allows water to start to flow into the hydrant.
Description : Which of the following is an obligation of being an ICAO contracting state? a. ICAO must be informed about all new flight crew licenses and any suspended validity of such licenses ... of tickets on international airline connections d. ICAO must be informed about changes to national regulations
Last Answer : b. ICAO must be informed about differences from the standards detailed in any of the annexes to the Chicago convention
Description : What connections in a TDR system are reversed to set up the system for addition?
Last Answer : . The R1 and R3 leads between the TDR rotor and the TX to which it is connected.
Description : What connections in a TDX system are reversed to set up the system for addition?
Last Answer : The number and type of synchro receivers, the mechanical loads on these receivers and the operating temperatures of both the transmitter and receivers.
Description : In a TDX system with standard synchro connections, the TX rotor is at 120º and the TDX rotor is at 40º. What position will the TR indicate?
Last Answer : . 80º.
Description : Where are the external connections made on standard synchros?
Last Answer : At the terminal board.
Description : In fiber-to-fiber connections, Fresnel reflection is one source of coupling losses. Light is reflected back into the source fiber and is lost. What causes Fresnel reflection?
Last Answer : A step change in refractive index that occurs at fiber joints, caused by fiber separation.
Description : Ships’ generators produce 450-volt, three-phase, ac power; however, most equipment uses 117-volt, single-phase power What transformers and connections are used to convert 450- volt, threephase power to 117-volt, single-phase power?
Last Answer : A method of generating oscillations, a method of turning the oscillations on and off (keying), and an antenna to radiate the energy.
Description : Those of you who believe in an immortal soul, how do you explain the physical connections to mental behavior?
Last Answer : answer:You are making a mistaken assumption. The soul doesn’t control or influence the brain or the physical, you’re conflating spiritual center with the physical body. Our behavior is not ruled by our souls.
Description : If coils 'R1-R2-R3' at the receiver of figure 'B' shown in the illustration turned opposite of those in the transmitter by design, what corrective action should be taken? EL-0092 A. Reverse the 60 Hz supply ... is needed. C. Interchange leads 'R1' and 'R3'. D. Interchange leads 'R2' and 'R3'.
Last Answer : Answer: B
Description : If coils 'R1-R2-R3' at the receiver of figure 'B' shown in the illustration were in 180 degree error with those of the transmitter, what corrective action should be taken? EL-0092 A. Reverse the 60 Hz ... is proper operation. C. Interchange leads 'R1' and 'R3'. D. Interchange leads 'R2' and 'R3'.
Last Answer : Answer: A
Description : If coils 'R1-R2-R3' at the receiver of figure 'B' shown in the illustration turned opposite of those in the transmitter, what corrective action should be taken to have both turn in the same direction? EL-0092 A ... is needed. C. Interchange leads 'R1' and 'R3'. D. Interchange leads 'R2' and 'R3'.
Last Answer : Answer: C
Description : A rheostat has 100 turns of a wire of radius 0.4 mm having resistivity `4.2xx10^(-7) Omega`m. The diameter of each turn is 3 cm. What is the maximum v
Last Answer : A rheostat has 100 turns of a wire of radius 0.4 mm having resistivity `4.2xx10^(-7) ... the maximum value of resistance that it can introduce ?
Description : Moving the rheostat handle shown in the illustration, that is used to control a DC generator, towards the 'raise' direction will increase the _____________. EL-0030 A. field resistance B. armature resistance C. armature speed D. line voltage
Last Answer : Answer: D
Description : An open occurring within the field rheostat of an AC generator can be detected by short circuiting its terminals and observing a ____________. A. negative deflection of the wattmeter pointer B. ... of the wattmeter pointer C. buildup of alternator voltage D. low, but constant alternator voltage
Description : Which of the following statements is true about the illustrated circuit? EL-0030 A. The field rheostat is used for manual voltage control. B. if the generator is flat compounded then the field rheostat ... to act like a series motor and overspeed with the controller in the full raise position.
Description : The kilowatt load can be adjusted on a paralleled generator by using the _____________. A. field rheostat B. governor control C. automatic voltage regulators D. hand tachometer
Description : The KW load is evenly distributed between two alternators just placed in parallel by adjusting _____________. A. a balance coil B. the governor settings C. the field excitation D. a rheostat
Description : If two AC generators have just been placed in parallel, the true power load is initially distributed evenly by _____________. A. a balance coil B. changing field excitation C. adjusting the governor control settings D. a rheostat
Description : What is the power rating safety factor for the light dimming rheostat shown in the illustration at '77H'? EL-0100 A. 1 B. 2 C. 3 D. 6
Description : If a unloaded shunt motor's field were weakened by rheostat resistance or by an open circuit, the motor would _________. A. overspeed due to reduced CEMF B. stop because of low flux C. continue to run at base speed D. slow down and overheat
Description : Which of the instruments listed is used to check insulation resistance? A. Magneto B. Megohmmeter C. Dynamometer D. Rheostat
Description : You are attempting to parallel two AC generators and the synchroscope pointer is revolving slowly in the fast direction. You should _____________. A. use the governor control switch to adjust the incoming ... the 0° position D. use the field rheostat to adjust the speed of the incoming machine
Description : The frequency of an AC generator is controlled by the _____________. A. rheostat B. governor C. exciter D. capacitor
Description : Loss of or weak residual magnetism in an alternator or generator can be corrected for by _________________. A. running the rotor in the opposite direction for 5 minutes B. allowing the generator ... rheostat fully counterclockwise D. using a storage battery or battery charger to 'flash' the field
Description : The frequency of an AC generator is adjusted by means of the ____________. A. main alternator field rheostat B. exciter field rheostat C. prime mover governor control D. equalizing reactor
Description : The cycles per second developed by the alternator aboard your vessel is determined by _____________. A. the speed of the engine driving the alternator B. the resistance applied to the field rheostat C. the synchronous speed of induction D. the adjustments made to the voltage regulator
Description : The speed of a wound-rotor induction motor _____________. A. will be fixed by the number of field poles B. can be varied by a rheostat-type control C. can only be synchronous speed at full load D. can only attain synchronous speed at no load
Description : A DC shunt generator has its field windings connected in _____________. A. series with the series windings B. parallel with the field rheostat C. series with the armature windings D. parallel with the armature windings
Description : When starting a DC propulsion motor the variable rheostat must FIRST be turned ____________. A. all the way to the run position then quickly back to slow B. to the slow position then gradually moved to full speed C. to the mid position D. quickly to the run position
Description : A variable shunt, connected across the series field coils of a DC compound wound generator, to permit adjustment of the degree of compounding, is called a _____________. A. divider B. diverter C. converter D. rheostat
Description : An adjustable resistor, whose resistance can be changed without opening the circuit in which it is connected, is called a _____________. A. bleeder resistor B. rheostat C. bridge D. variable shunt strip
Description : The simplest method of controlling the terminal voltage of compound-wound DC generator is with a _____________. A. hand-operated field rheostat connected in series with the shunt field circuit B. ... in series with the load D. balance coil diverting neutral current through the shunt field
Description : The device that most commonly utilizes the principle of electromagnetic induction is the _____________. A. diode B. transformer C. transistor D. rheostat
Description : A motor using a rheostat in the motor circuit to vary the speed is called a ____________. A. squirrel-cage induction motor B. regenerative braking motor C. wound-rotor induction motor D. synchronous motor
Description : What is the diff. between electronic regulator and ordinary rheostat regulator for fans?
Last Answer : The difference between the electronic and ordinary regulator is that in electronic reg. power losses are less because as we decrease the speed the electronic reg. give the power needed for ... speed is controlled but in rheostatic control resistance is decreased by steps to achieve speed control.
Description : What is the diff. btwn. Electronic regulator and ordinary rheostat regulator for fans?
Last Answer : A: The difference between the electronic and ordinary regulator is the fact that in electronic reg. power losses tend to be less because as we minimize the speed the electronic reg. give ... speed is controlled but in rheostatic control resistance is decreased by steps to achieve speed control.
Description : In the motors starting purpose why the armature rheostats at maximum position while the field rheostat is kept in minimum position?
Last Answer : A: In the time of starting a motor the field rheostat is kept in minimum state for the high starting torque. In the time of starting a motor the armature rheostats is used to control or reduce the high starting current. This high starting current can damage the motors starting systems.
Description : What is the difference between resistor, rheostat and potential divider?
Last Answer : Resistor: a fixed resistance connected permanently in the circuit for limiting the current to definite value is called the resistor. Rheostat: a variable resistance by sliding contacts on it the current can ... : when a resistance is used to develop a voltage drop it is called a potential divider.
Description : What is the difference between Electronic regulator and ordinary rheostat regulator for fans?
Last Answer : The difference between the electronic and ordinary regulator is that in electronic regulator power losses are less because as we decrease the speed the electronic regulator give the power needed ... is controlled but in rheostat control resistance is decreased by steps to achieve speed control.
Description : What is the purpose of the rheostat in ohmmeter?
Last Answer : compensate aging battery of the mter
Description : A multipurpose instrument for measuring current, potential difference and resistance is a) Ohmmeter b) Astatic galvanometer c) Rheostat d) AVO Meter
Last Answer : d) AVO Meter
Last Answer : During rheostat braking of D.C. series motors motor is run as a generator.
Description : what is Rheostat ?
Last Answer : Rheostat is varible resistance device which gives large range variation in resistance generally used for operating electrical motors
Description : Other than their physical differences, what is the major difference between a TDX and a TDR?
Last Answer : Their application: a TDX has one electrical and one mechanical input with an electrical output.
Description : What are two major differences between velocity servos and position servos?
Last Answer : Velocity loop senses velocity rather than position. When velocity loop is nulled, an error signal is still present and the load continues to move.
Description : What are the major differences between magnetic tape units?
Last Answer : The speed at which the tape is moved past the read/write head and the density of the recorded information.