What are the logic’s adopted in barring gear motor?

What are the logic’s adopted in barring gear motor?
by

1 Answer

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 of MCC)

a) All above

b) Bearing oil pressure is >0.35 kg/ cm2.

c) No thermal over load of 42S.

d) No one-DG condition.

Start permission (42 of MCC)

a) Start permissive of 42S.

b) Barring gear engage or motor speed reached to 1475 rpm.

c) Turbine speed is <100 rpm.

d) Bearing oil pressure is >0.35 kg/ cm2.

e) No thermal over load of 42.

f) No one-DG condition. 

by

Related questions

Why starting resistor is provided in barring gear motor?

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. 

What are the logics adopted to close the field breaker?

Description : What are the logics adopted to close the field breaker? 

Last Answer : a) Turbine speed 2880 rpm. b) Class A, B and BG trip reset. c) Auto/manual reference minimum. d) Auto/manual channels supply normal. e) FB closing circuit healthy.

What are the purposes of barring gear?

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. 

Register are assumed to use positive-edge-triggered _ a. Flip-flop b. Logics Cc. Circuit d. Operation

Description : Register are assumed to use positive-edge-triggered _ a. Flip-flop b. Logics Cc. Circuit d. Operation

Last Answer : a. Flip-flop

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 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

Last Answer : Answer: B

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

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

What type of motor starting adopted in MCC?

Description : What type of motor starting adopted in MCC?

Last Answer : DOL (direct on line) starter.  

Is there no mechanism that disallows a president from barring certain news outlets?

Description : Is there no mechanism that disallows a president from barring certain news outlets?

Last Answer : answer:Welcome to Trump-Land. Where lies are common and “Fake news” is videos of Trump doing things he said he didn’t do.

Generally, barring accidents, do vegetarians live longer and better?

Description : Generally, barring accidents, do vegetarians live longer and better?

Last Answer : answer:99% of longevity is genetically based. My great grandmother was born a 7 month preemie in a farm house in Indiana in 1885. She lived til almost 98, independently until 97 and attributed her longevity to ... you want, I don;t want to live to be 100 and I am not into self deprivation. lol

Barring self defense and defense of others in obviously immiment physical peril, what would it take to get you mad enough to fight?

Description : Barring self defense and defense of others in obviously immiment physical peril, what would it take to get you mad enough to fight?

Last Answer : answer:Considering that I: 1) Go to jail forever if I get into a fight for almost any reason; 2) Will lose a fight unless I try to heinously injure my opponent in the first couple of seconds ... Fighting is stupid anyhow. Usually it's boys being moronic over something. We should all just screw hug.

If you had an extra room in your home, what would you do with it, barring any financial restrictions?

Description : If you had an extra room in your home, what would you do with it, barring any financial restrictions?

Last Answer : I would either throw ALL my shit in there and make it a junk room Or I would turn it into an entertainment room (pool table, huge t.v., video game consoles, etc).

The chemical potential of a component (μi) of a phase is the amount by which its capacity for doing all work, barring work of expansion is increased per unit amount of substance added for an infinitesimal addition at constant temperature and pressure. It is given by (A) (∂E/∂ni)S, v, nj (B) (∂G/∂ni)T, P, nj = (∂A/∂ni) T, v, nj (C) (∂H/∂ni)S, P, nj (D) All (A), (B) and (C)

Description : The chemical potential of a component (μi) of a phase is the amount by which its capacity for doing all work, barring work of expansion is increased per unit amount of substance added for an infinitesimal addition at constant temperature and ... , nj (C) (∂H/∂ni)S, P, nj (D) All (A), (B) and (C)

Last Answer : (D) All (A), (B) and (C)

Critical temperature is defined as the temperature above which a gas will (A) Not liquify (barring exceptions) (B) Immediately liquify (C) Never liquify however high the pressure may be (D) None of these

Description : Critical temperature is defined as the temperature above which a gas will (A) Not liquify (barring exceptions) (B) Immediately liquify (C) Never liquify however high the pressure may be (D) None of these

Last Answer : (C) Never liquify however high the pressure may be

What if you stopped in 5th gear on your motor cycle can you still downshift while stopped?

Description : What if you stopped in 5th gear on your motor cycle can you still downshift while stopped?

Last Answer : as long as the clutch is engaged there shouldnt be a problem. not a motorcycle person though, im a car person, but im sure the same concepts apply.

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

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

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 : 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

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 steering gear room B. each power operated watertight door system C. each charging panel for temporary emergency batteries D. all of the above

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

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 : 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

Last Answer : Answer: A

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 volts were applied to the 'setpoint module' B. 'reduction gear lube oil pressure' fell below switch setting C. 50 PSI were applied to the 'setpoint module' D. the pressure switch closed

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

Last Answer : Answer: B

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 helm B. move in one direction only regardless of the movement of the helm C. not respond to output from the rotary actuator D. stop moving only when the helm is counter-rotated to put the pump at neutral stroke

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

Last Answer : Answer: A

What are the interlocks between 415 V and 6.6 kV switch gear?

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. 

What is requirement of speeder gear assembly?

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. 

What is the type of brush used in brush gear?

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. 

How cooling is done for slip ring and brush gear?

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.

What is the function of speeder gear?

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. 

What are the purposes of turning gear?

Description : What are the purposes of turning gear? 

Last Answer : Turning gear is used to run the turbine from rest to low speed and from normal running speed to low speed with the help of barring motor to eliminate the hogging and sagging of turbine because of the high temperature. 

List out energy conservation techniques to be adopted to reduce losses in the induction motor.

Description : List out energy conservation techniques to be adopted to reduce losses in the induction motor.

Last Answer : Following are the list of energy conservation techniques in electrical motors:  1) Reduction in iron losses by using low loss silicon steel core material laminated to thinner dimension. 2) Using bigger ... balancing. 11) By improving power quality. 12) Operating motor in star mode at light load.

What are the methods adopted to reduce harmonic torques?

Description : What are the methods adopted to reduce harmonic torques?

Last Answer : The methods used for reduction or elimination of harmonic torques are chording, integral slot winding, skewing and increasing the length of air gap.

Why wound rotor construction is adopted?

Description : Why wound rotor construction is adopted?

Last Answer : The wound rotor has the facility of increasing the rotor resistance through slip rings. High value of rotor resistance is needed during starting to get a high value of starting torque.

Why synchronizing scheme has been adopted? What are interlocks provided?

Description : Why synchronizing scheme has been adopted? What are interlocks provided?  

Last Answer : To check running and incoming buses, which are going to be interconnected are in synchronism with each other. Interlocks 1. Synch selector. 2. Only one breaker can operate at a time. 3. ... will bypass this synch contact). Bypass facility is provided to close the breaker on dead bus only. 

Why ungrounded 250V DC system adopted in our system?

Description : Why ungrounded 250V DC system adopted in our system?

Last Answer : The 250V DC system is feeding to some of the vital loads such as breaker control etc. Even if one ground has occurred then also these controls should be available. Continuous monitoring of ground current is employed to eliminate the by passing of logic due to double ground. 

What are the protections adopted in UPS or PMCC supply?

Description : What are the protections adopted in UPS or PMCC supply?

Last Answer : LV (incomer) or UPS input CTZM, Over current, Short circuit protections PMCC S or T input or UPS output Under voltage (27), 51RYB, 51N protections. 

What is the purpose of static starter? How current setting adopted?

Description : What is the purpose of static starter? How current setting adopted?

Last Answer : The static starter limits the starting current of the motor to 2.5 times the motor rated current instead of 6 times the rated current. If the motor is directly on UPS, the UPS fuse will blow, ... set to limit the starting current. This is achieved by firing angle control of back to back thyristor. 

How neutral grounding adopted?

Description : How neutral grounding adopted? 

Last Answer : For above 3.3 kV and below 22 kV resistance grounding is preferred. In this voltage level capacitive ground current is not large, so reactance grounding is not used. For below 3.3 kV ... in transmission lines, generators etc. to neutralize capacitive current by adding reactive current.  

What are the lighting systems adopted in KGS?

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. 

What are the types of bearings are adopted for small motors and large motors?

Description : What are the types of bearings are adopted for small motors and large motors?

Last Answer : Small motors (LT motors) Horizontal mounted - deep groove ball bearing at both ends. Medium motors Roller bearing at DE and deep groove bearing at NDE. Large motors (HT motors above 750 kW) Horizontal ... mounted - face to face angular contact ball bearing at NDE and roller or ball bearing at DE.