What are the torque settings used in IPBD connection?

What are the torque settings used in IPBD connection?
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1 Answer

Answer :

M12 (Nut bolt) 4506 100 kg-cm or 55 NM

M16 (Nut bolt) 9006 250 kg-cm or 80 NM

M20 (Nut bolt) 18006300 kg-cm or 100 NM 
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Description : What are the tests to be carried during PM checks of IPBD?  

Last Answer : a) Physical inspection of bus for any spark or overheating or discoloration. b) Physical inspection of copper braided flexibles for discoloration. c) Physical inspection of inspection window gaskets, seal off ... Tan-delta test of IPBD m) IR value measurement n) Cleanliness checks entire IPBD. 

What are the isolations required for working on IPBD/ Generator?

Description : What are the isolations required for working on IPBD/ Generator?

Last Answer : a. Generator field breaker open and tagged. b. GT breaker open and earth switch closed.  c. Barring gear motor stopped and tagged. d. Generator PT's isolated and tagged. e. CB 472 and CB 474 open ... 's are isolated and tagged. f. Before doing any work on brush gear 64F1 relay to be taken out. 

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Description : What is the protection for IPBD? 

Last Answer : Generator – GT overall differential protection.  

What is use of hot air blower in IPBD?

Description : What is use of hot air blower in IPBD?

Last Answer : To remove moisture and to prevent moisture condensation inside the duct at commissioning time or in long shutdown periods. 

Why seal-off bushings are used in IPBD?

Description : Why seal-off bushings are used in IPBD?  

Last Answer : To prevent interchange of air at different temperature and leakage of hydrogen or infiltration of dust into the bus duct. 

Why aluminium bus bars are silver-plated in IPBD?

Description : Why aluminium bus bars are silver-plated in IPBD?

Last Answer : Aluminium bus bars are silver-plated at flexible connection to prevent the galvanic corrosion ant also for low contact resistance. 

Why neoprene rubber bellows are used in IPBD?

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Last Answer : Neoprene rubber bellows are used near the terminals of the equipment and also at building wall from indoor to outdoor area to allow thermal expansion and to minimise vibrations. 

What are the salient features of IPBD?

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Last Answer : a. This for a vital link between generator, GT, UAT, SPPT, SET and neutral grounding transformer. b. The continuous enclosure operating at ground potential limits the leakage flux outside the enclosure ... maintenance is nil. j. Separate parts erected IPBD. Hence changing parts makes it easy. 

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Description : Why flexible expansion joints are used in IPBD?

Last Answer : To cater thermal expansion and contraction due to heating and to eliminate mechanical vibrations to the equipment. 

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Description : What is type of nut and bolts are used in IPBD?  

Last Answer : Non-magnetic stainless steel nut and bolts are used in IPBD to restrict magnetic effect at joints.  

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Description : Why neoprene rubber bellows in generator IPBD?

Last Answer : Prevent vibrations transmitted from generator to IPBD.  

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Description : The torque and current curves for a three-phase induction motor with a cage rotor, are shown in the illustration. Which of the following statements is true concerning the depicted curves? EL-0056 A. As slip ... D. If the motor is loaded to the point where 40% slip has resulted, it will stall.

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Last Answer : Answer: D

The primary function of an electric motor is to ___________. A. develop torque B. generate high voltages C. produce a magnetic field D. generate high electrical resistance

Description : The primary function of an electric motor is to ___________. A. develop torque B. generate high voltages C. produce a magnetic field D. generate high electrical resistance

Last Answer : Answer: A

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Last Answer : Answer: A

A characteristic of a wound-rotor induction motor, with a high resistance rotor winding, is _____________. A. low starting torque B. high starting torque C. high speed D. low starting voltage

Description : A characteristic of a wound-rotor induction motor, with a high resistance rotor winding, is _____________. A. low starting torque B. high starting torque C. high speed D. low starting voltage

Last Answer : Answer: B

If an induction motor were to be operated at 90% rated voltage, _____________. A. there would be an increase in starting torque B. starting current would increase slightly C. synchronous speed would decrease slightly D. the slip would increase

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Last Answer : Answer: D

The function of the autotransformers used with the starters of large AC motors is to provide _____________. A. increased voltage for starting B. increased torque for starting C. reduced voltage for starting D. speed control

Description : The function of the autotransformers used with the starters of large AC motors is to provide _____________. A. increased voltage for starting B. increased torque for starting C. reduced voltage for starting D. speed control

Last Answer : Answer: C

The full load torque of an electric motor is the __________. A. minimum torque developed by the motor accelerating from stop to full speed B. turning moment exerted by the motor at rated load and speed C. maximum torque developed by the motor with rated voltage and frequency D. turning moment exerted by the motor from any rotor angular position at any load

Description : The full load torque of an electric motor is the __________. A. minimum torque developed by the motor accelerating from stop to full speed B. turning moment exerted by the motor at rated load ... and frequency D. turning moment exerted by the motor from any rotor angular position at any load

Last Answer : Answer: B

Excessive heat in an operating motor controller can result from _____________. A. a closed starter contact B. loose connections C. missing arc chutes D. low motor starting torque

Description : Excessive heat in an operating motor controller can result from _____________. A. a closed starter contact B. loose connections C. missing arc chutes D. low motor starting torque

Last Answer : Answer: B

An across-the-line starter provides ___________________. A. maximum torque B. slow starting power C. high speed D. reduced voltage

Description : An across-the-line starter provides ___________________. A. maximum torque B. slow starting power C. high speed D. reduced voltage

Last Answer : Answer: A

If a three-phase induction motor malfunctions and drops to a single-phase (one supply line open) ____________. A. the motor will continue to run if it is not heavily loaded B. more torque will be developed C. the motor will immediately stop and not be able to be restarted D. the motor will immediately stop and can only be restarted at no load

Description : If a three-phase induction motor malfunctions and drops to a single-phase (one supply line open) ____________. A. the motor will continue to run if it is not heavily loaded B. more torque will be ... be able to be restarted D. the motor will immediately stop and can only be restarted at no load

Last Answer : Answer: A

The timer element found in a reverse power relay obtains its operating torque via _____________. A. line voltage B. the main bus C. electromagnets D. a separate battery source

Description : The timer element found in a reverse power relay obtains its operating torque via _____________. A. line voltage B. the main bus C. electromagnets D. a separate battery source

Last Answer : Answer: C

Regarding an induction motor, the power developed by the rotor automatically adjusts itself to the _____________. A. power required to drive the load B. speed required to drive the load C. current flow in the motor stator D. torque developed by the rotating field

Description : Regarding an induction motor, the power developed by the rotor automatically adjusts itself to the _____________. A. power required to drive the load B. speed required to drive the load C. current flow in the motor stator D. torque developed by the rotating field

Last Answer : Answer: A

What is the function of the interpoles installed in DC motors? A. To provide greater torque by strengthening the main field. B. To provide sparkless commutation without having to shift the brushes. C. To limit the production of counter-electromotive force. D. To limit the starting surge current.

Description : What is the function of the interpoles installed in DC motors? A. To provide greater torque by strengthening the main field. B. To provide sparkless commutation without having to shift the brushes. C. To limit the production of counter-electromotive force. D. To limit the starting surge current.

Last Answer : Answer: B

Reduced voltage applied to a motor during the starting period will _____________. A. result in decreased acceleration time only B. lower the starting current and increase accelerating time C. cause a greater starting torque D. increase the starting current and pump capacity

Description : Reduced voltage applied to a motor during the starting period will _____________. A. result in decreased acceleration time only B. lower the starting current and increase accelerating time C. cause a greater starting torque D. increase the starting current and pump capacity

Last Answer : Answer: B

Across-the-line starters are used with AC motors to provide _____________. A. reduced starting current B. regulated starting current C. high starting torque D. controlled starting acceleration

Description : Across-the-line starters are used with AC motors to provide _____________. A. reduced starting current B. regulated starting current C. high starting torque D. controlled starting acceleration

Last Answer : Answer: C

The rotor slots of a repulsion-type motor are generally skewed (placed nonparallel to the rotor axis) to _________. A. produce a constant starting torque B. permit a greater air gap with the starter C. permit a smaller air gap with the starter D. reduce eddy current losses

Description : The rotor slots of a repulsion-type motor are generally skewed (placed nonparallel to the rotor axis) to _________. A. produce a constant starting torque B. permit a greater air gap with the starter C. permit a smaller air gap with the starter D. reduce eddy current losses

Last Answer : Answer: A