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Answer :

Plugging method of braking is generally used in elevators.

Related questions

Last Answer : Regenerative method of braking is based on that back e.m.f. is equal to the applied voltage.

Last Answer : Cumulative compound D.C. motor is preferred for elevators.

Last Answer : Shunt motors,  Series motors, Compound motors

Description : Explain in brief how anti-lock braking system works

Last Answer : An ABS is a system on motor vehicles which prevents the wheels from locking while braking stopping safely is one of the most important functions a motor vehicle can perform. Diagram: ... to decrease the pressure on the braking circuit, effectively reducing the braking force on that wheel.

Last Answer : The braking retardation is usually in the range 10 to 15 km phps.

Last Answer : During rheostat braking of D.C. series motors motor is run as a generator.

Last Answer : Speed control by Ward Leonard method gives uniform speed variation in both directions.

Description : Why do people waiting to get on an elevator always stand right in the doorway?

Last Answer : Funny, this brings back a memory of where I used to work. I think the person getting off should be allowed to get off and then the people waiting should get on. There was a little lawyer that barged on the elevator every time, almost knocking people down. We called her the “elevator Nazi”.

Description : Care to share your most memorable elevator experience?

Last Answer : My favorite actually happened to my Mom. She and a about 7 middle-aged female friends were on an elevator when a 30-something guy got on. The doors closed. The most attractive of the bunch, my Mom's friend ... said, Let's get him, girls! The look on the young man's face was, apparently, priceless!

Description : How to Choose a Birth Control Method

Last Answer : How to Choose a Birth Control Method Birth control methods depend on the couple's needs and commitment to the method. Some couples just need to prevent pregnancy while others wish to avoid sexually- ... unplanned sex, a broken condom or failure to take birth control pills two days in a row.

Description : How to Use the Rhythm Method

Last Answer : How to Use the Rhythm Method The rhythm method is one of the many natural ways of birth control. This technique is based on the length of your menstrual cycle. Here are some tips you can ... their phases. There are numerous natural birth control techniques. Use the one the best suits your needs.

Description : Explain the thermal triggering method of SCR. Enlist different triggering methods of SCR.

Last Answer : Types of Triggering: 1) Forward voltage triggering 2) Thermal triggering (Temperature triggering) 3) Radiation triggering (Light triggering) 4) dv/dt triggering 5) Gate triggering ... generated leakage current increases. This current gets multiplied internally and thyristor is turned on. 

Description : Illustrate with neat wiring diagram a single lamp control by two point method.

Last Answer : Single lamp control by two point method:  This system is commonly used for stair case wiring. It consists of two way switches (the switch operates always in one of the two possible positions) the ... the person will change the position of switch S2, so that the lamp will be switched OFF'.

Description : A parallel RLC circuit has the node equation Determine v(t) using the phasor method.

Last Answer : A parallel RLC circuit has the node equation Determine v(t) using the phasor method.

Description : Describe fire extinguishing method.

Last Answer : (i) Carbon Dioxide Extinguishing Systems  This type is the most suitable & widely recommended one for electrical fires. Carbon dioxide (CO2) extinguishers are normally Class C ... particles to expand chemically inhibiting combustion and expelling the oxygen thereby smothering the flames.

Description : Draw and explain bulk correction method for power factor & control.

Last Answer : Bulk correction method for power factor & control: i) Here individual starter controls the capacitors located at distribution panel. ii) Centralized compensation is employed in large industrial plants where many ... capacitor units in steps to maintain P.F. more than preset limit (0.95). 

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 : Merits of two wattmeter method

Last Answer : Advantages of Two Wattmeter Method for 3-Phase Power Measurement: 1) It is used for balanced as well as unbalanced load. 2) For the star type load, it is not necessary to ... reactive volt-amperes for balanced loads also. 7) The circuit connections are independent of load connection.

Description : Write one advantage and one disadvantage each for spring control method and gravity control method.

Last Answer : Advantages of Spring Control Method: 1) The spring-controlled meters may be used in any position. 2) In some instruments, springs can be used as current leads. 3) As springs are light in weight ... only. 2) Scale is non-uniform. 3) Control weights add to the weight of instrument.

Description : State any two disadvantages of one wattmeter method of measurement of 3 phase power.

Last Answer : State any two disadvantages of one wattmeter method of measurement of 3 phase power. Disadvantages of one wattmeter method:- 1. Only used for balanced load 2. It can not be used for ... connection then neutral point must be available 4. Delta connection must be opened to connect current coil.

Description : With neat diagram explain calibration of energy meter by direct loading method.

Last Answer : Calibration of Energy Meter by Direct Loading Method:  There are three methods for testing/calibration:  1. Long period dial test  2. Using rotary sub- standard meter  3. Using precision grade instruments  All ... of substandard meter in kWh  Then % error = [(D - DS)/DS] x 100

Description : Explain V- I method of measurement of medium resistance. 

Last Answer : In this method, use suitable source, ammeter and voltmeter and connect them as shown in the above diagram. Take reading of voltmeter and ammeter, then value of resistance = R = V/I Ω To minimise the error take 4 to 5 observation for the same resistance and take their average.

Description : Explain spring control method with neat diagram.

Last Answer : Spring Control Method: As shown in the figure the inner ends of the both springs are attahced to the spindle ,while outer end of upper spring is attached to the lever and outer end of ... the springs are twisted in opposite direction to the motion of pointer and produce controlling torque.

Description : List one advantage and one disadvantage of one wattmeter method. 

Last Answer : Advantages:  1) Only one wattmeter is used.  2) Less number of connections.  3) Cost required is less.  Disadvantages:  1) Used only for 3- Φ balanced load and not for ... be accessible for connecting the Pressure coil.  3) Delta connection must be opened to connect current coil. 

Description : List any four errors in induction type energy meter. Give method of compensation for each.

Last Answer : Errors in Induction Type Energy Meter with their Compensation:  1) Error due to friction: This error can be compensated by the additional shading band provided on the shunt electromagnet.  2) Phase ... error: This error can be compensated by providing a flux diverter' to the current magnet. 

Description : The self GMD method is used to evaluate

Last Answer : The self GMD method is used to evaluate inductance and capacitance

Description : The power consumed by a balanced 3-ph load is measured by two-wattmeter method. The meter readings are 8 kW and 4 kW. The power factor of the load is (A) zero (B) 0.5 (C) between zero and 0.5 (D) between 0.5 and unity

Last Answer : The power consumed by a balanced 3-ph load is measured by two-wattmeter method. The meter readings are 8 kW and 4 kW. The power factor of the load is between 0.5 and unity

Description : Compared to Gauss-Seidel method, Newton-Raphson method takes : A. less number of iterations and more time per iteration B. less number of iterations and less time per iteration C, more number of iterations and more time per iteration D. more number of iterations and less time per iteration

Last Answer : Compared to Gauss-Seidel method, Newton-Raphson method takes : A. less number of iterations and more time per iteration B. less number of iterations and less time per iteration ... of iterations and more time per iteration D. more number of iterations and less time per iteration

Description : The bridge method commonly used for finding mutual inductance is (A) Heaviside Campbell bridge (B) Schering bridge (C) De Sauty bridge (D) Wien bridge

Last Answer : The bridge method commonly used for finding mutual inductance is Heaviside Campbell bridge

Last Answer : Plugging braking method can bring the locomotive to dead stop.

Last Answer : The main disadvantage of the Ward-Leonard control method is high initial cost, high maintenance cost, low efficiency at light loads.

Last Answer : For constant torque drive armature voltage control speed control method is preferred.

Last Answer : Annual depreciation as per straight line method, is calculated by the capital cost minus the salvage value, is divided by the number of years of life.

Description : In a regenerative braking, which of the following is generally true?  (a) Back e.m.f. in the motor exceeds the applied voltage (b) Back e.m.f. is less than the applied voltage ... dissipated in a resistance (d) Kinetic energy of the motor is dissipated through free wheeling diode across the motor 

Last Answer : In a regenerative braking, which of the following is generally true?  (a) Back e.m.f. in the motor exceeds the applied voltage (b) Back e.m.f. is less than the applied voltage ... in a resistance (d) Kinetic energy of the motor is dissipated through free wheeling diode across the motor 

Description : What are the features of the best (in whatever way) elevators in the world?

Last Answer : Elevator with see through floor on the outside of the building. CNN report

Description : When do you see buttons in elevators "G" for Ground and when is it "1"(1st) floor?

Last Answer : And G can be for garage. I think it depends on the individual building, and how they set it up. And L can be for lobby, where 1 is for the floor above.

Description : In what country do they reserve elevators for the ones who need it only?

Last Answer : In Japan the engineering office where I worked was on the 4th floor. It was considered lazy and dishonorable to take the elevator. You could use it without shame if you were moving a lot of material, a woman ... it. We'd go up the 4 flights 2 steps at a time - and pretend we were not winded.

Description : Are residential elevators overpriced?

Last Answer : I think for 25,000 I would save it and buy a larger ranch style house, rather than putting 25k into an elevator. My guess would be that the few companies that install residential elevators know ... cutting out the floor, installing the electrical, the unit itself, and the labor for all the rest.

Description : Are there elevators in giant windmills?

Last Answer : Stairs.

Description : Term for meeting more people near elevators?

Last Answer : Those areas are like a ‘hot spot’ of socializing. I guess that’s what I would call it. A social hot spot. Or a common meeting place. I don’t know of a specific term, but I can think of a few describing words that would work.

Description : what- two elevators are side by side. the freight elevator is at the bottom floor and traveling upward, and the express elevator is at the 20th floor and traveling downward. the height of the freight elevator?

Last Answer : in floors is described by the equation y= 1/4x, ......

Description : What did people do before elevators were invented?

Last Answer : People took the stairsBuilding height was limited by the number of floors people couldbe expected to climb up or down on the stairs

Description : What is the extreme fear of elevators called?

Last Answer : What is the answer ?

Description : What exactly do the emergency buttons in elevators do?

Last Answer : Older elevators have an emergency button to contact the building engineer in the event of a malfunction. Newer ones have a phone you can use to call the building supervisor to tell ... and some connect you with the maintenace department. Always check an elevator for emergency instructions.

Description : How are home elevators installed?

Last Answer : Elite Elevators providing home lifts in UAE. They are installed in any type of homes to provide an elegant look for the homes as well as to add convenience in the travel along the floors of the homes. Home elevators are available in various models and designs with various specifications

Description : Do all apartments have residential elevators?

Last Answer : Though residential elevators do add value to a property, not all apartments have residential elevators. If you would like to use one, you should check with the property before signing a rental agreement.

Description : Does Medicare pay for chair elevators for the disabled?

Last Answer : I need a chair elevator for my husband that is disabled. Will medicare pick up the cost?

Description : Bucket elevators are not suitable for the vertical lifting of __________ materials. (A) Fine (e.g. - 200 mesh size coal) (B) Sticky (e.g. clay paste) (C) Small lumpy (e.g. grains and sand) (D) Free flowing

Last Answer : (B) Sticky (e.g. clay paste

Description : Which of the following mechanical conveyors does not come under the division ‘scrapers’? (A) Ribbon conveyor (B) Flight conveyor (C) Bucket elevators (D) Drag conveyor

Last Answer : (C) Bucket elevators

Description : The control surface which gives longitudinal control is: a. The rudder b. The ailerons c. The elevators d. The flaps

Last Answer : c. The elevators