Large capacity generators are invariably?

by

1 Answer

Answer :

Large capacity generators are invariably hydrogen cooled.

by

Related questions

_______ is invariably used as base load plant.

Last Answer : Nuclear power plant is invariably used as base load plant.

In a power plant if the maximum demand on the plant is equal to the plant capacity, then?

Last Answer : In a power plant if the maximum demand on the plant is equal to the plant capacity, then plant reserve capacity will be zero.

Generating capacity connected to the bus bars and ready to take load when switched on is known as ?

Last Answer : Generating capacity connected to the bus bars and ready to take load when switched on is known as spinning reserve.

For high value of diversity factor, a power station of given installed capacity will be in a position to supply?

Last Answer : For high value of diversity factor, a power station of given installed capacity will be in a position to supply more number of consumers.

Generators for peak load plants are usually designed for maximum efficiency at?

Last Answer : Generators for peak load plants are usually designed for maximum efficiency at 50 to 75 percent full load.

How to Shrink Large Pores

Description : How to Shrink Large Pores

Last Answer : How to Shrink Large Pores Large pores can be a hassle, especially in a world full of airbrushed models with no visible pores filling our magazine pages. Large pores can also lead to a tendency ... add calamine or sandalwood powder to the tomato juice before applying. Rinse it off with warm water.

A large AC generator, supplying power to an infinite bus, has a sudden short-circuit occurring at its terminals

Description : A large AC generator, supplying power to an infinite bus, has a sudden short-circuit occurring at its terminals. Assuming the prime mover input and the voltage behind the transient reactance to remain constant immediately after the fault, acceleration of the generator rotor is

Last Answer : A large AC generator, supplying power to an infinite bus, has a sudden short-circuit occurring at its terminals. Assuming the prime mover input and the voltage behind the transient reactance ... , acceleration of the generator rotor is inversely proportional to the moment of inertia of the machine

A sensitive galvanometer produces large deflection for a?

Last Answer : A sensitive galvanometer produces large deflection for a small value of current.

Interruption of large currents by relay requires?

Last Answer : Interruption of large currents by relay requires arc suppressing blow out coils, wide separation of the opened contacts, high speed opening of contacts.

What is the channel capacity of a noisy channel with conditional probability of error p = 1/2?

Description : What is the channel capacity of a noisy channel with conditional probability of error p = 1/2? A) 0 B) 1 C) Infinity D) 2  

Last Answer : What is the channel capacity of a noisy channel with conditional probability of error p = 1/2?  A) 0 B) 1 C) Infinity D) 2  

As per Shannon’s channel capacity theorem, if samples are transmitted in ‘T’ seconds over a noisy channel

Description : As per Shannon’s channel capacity theorem, if samples are transmitted in ‘T’ seconds over a noisy channel which is bandlimited to ‘B’ Hz. The number of samples ‘n’ is given by (symbols/notations carry their usual meaning) A) B/T B) T/B C) 2BT D) BT/2 

Last Answer : As per Shannon’s channel capacity theorem, if samples are transmitted in ‘T’ seconds over a noisy channel which is bandlimited to ‘B’ Hz. The number of samples ‘n’ is given by ( ... /notations carry their usual meaning) A) B/T B) T/B C) 2BT D) BT/2 

Breaking capacity of a circuit breaker is usually expressed in terms of

Description : Breaking capacity of a circuit breaker is usually expressed in terms of  (1) Ampere (2) Volts (3) MW (4) MVA

Last Answer : Breaking capacity of a circuit breaker is usually expressed in terms of MVA

Power station having Load factor = 70%, capacity factor = 50%, used factor = 60%, maximum demand = 20MW

Description : Power station having Load factor = 70%, capacity factor = 50%, used factor = 60%, maximum demand = 20MW then annual energy production is  (1) 122.8 GWh (2) 198.55 GWh (3) 128.2 GWh (4) 188.82 GWh

Last Answer : Power station having Load factor = 70%, capacity factor = 50%, used factor = 60%, maximum demand = 20MW then annual energy production is 122.8 GWh

Overload capacity of diesel engines is usually restricted to?

Last Answer : Overload capacity of diesel engines is usually restricted to 2 percent.

DC GENERATORS MCQ

Description : DC GENERATORS MCQ

Last Answer : 101. Wave winding is composed of (a) any even number of conductors (b) any odd number of conductors (c) that even number which is exact multiple of poles + 2 (d) that even number ... increase the field resistance (c) increase the speed of primemover (d) check armature insulation resis¬tance Ans: a

How Generators Work

Description : How Generators Work

Last Answer : How Generators Work Generators are devices which produce electricity. They produce electricity by converting mechanical energy from power sources. Examples would be steam, water, wind and gasoline. These ... can also be used for recreational purposes. Examples would be camping, boating or fishing.

Why are generators rated in kVA not in kW ?

Description : Why are generators rated in kVA not in kW ?

Last Answer : Because It's rating of generator kva is apparent power. Kw is active power which we use. And one is kvar reactive power.

Two synchronous generators G1, G2 are operating in parallel and are equally sharing KVAR (Lag) component

Description : Two synchronous generators G1, G2 are operating in parallel and are equally sharing KVAR (Lag) component of load. To shift part of KVAR from G2 to G1, while keeping terminal voltage fixed, the following action must be done

Last Answer : Two synchronous generators G1, G2 are operating in parallel and are equally sharing KVAR (Lag) component of load. To shift part of KVAR from G2 to G1, while keeping terminal voltage fixed, the following action must be done Raise If1 and lower If2

Identify the increasing order of voltage regulation of the following dc generators a same load :

Description : Identify the increasing order of voltage regulation of the following dc generators a same load :  (A) differential compound, shunt and under compound  (B) shunt, differential compound and ... C) under compound, shunt and differential compound  (D) shunt, under compound and differential compound

Last Answer : Identify the increasing order of voltage regulation of the following dc generators a same load : under compound, shunt and differential compound 

Two synchronous generators operating in parallel supply a common load of 2.5 MW. The frequency-power

Description : Two synchronous generators operating in parallel supply a common load of 2.5 MW. The frequency-power characteristics have a common slope of 1 MW/Hz and the no-load frequencies of the generators are 51.5 Hz and 51.0 Hz, ... system frequency is (A) 50 Hz (B) 51 Hz (C) 51.25 Hz (D) 51.5 Hz

Last Answer : Two synchronous generators operating in parallel supply a common load of 2.5 MW. The frequency-power characteristics have a common slope of 1 MW/Hz and the no-load frequencies of the generators are 51.5 Hz and 51.0 Hz, respectively. Then the system frequency is 50 Hz

When two D.C. series generators are running in parallel, an equilizer bar is used?

Last Answer : If  equalising bar is connected to the 2 DC generators  the current will be equal in 2 generators irrespective of parallel connection so that we connect equaliser bar

In D.C. generators the polarity of the interpoles?

Last Answer : In D.C. generators the polarity of the interpoles is the same as that of the main pole ahead.

For the parallel operation of two or more D.C. compound generators, we should ensure that?

Last Answer : For the parallel operation of two or more D.C. compound generators, we should ensure that series fields of all generators should be either on positive side or negative side of the armature.

Compensating windings are used in D.C. generators?

Last Answer : Compensating windings are used in D.C. generators to neutralise the cross-magnetising effect of the armature reaction.

D.C. generators are connected to the busbars or disconnected from them only under the floating condition?

Last Answer : D.C. generators are connected to the busbars or disconnected from them only under the floating condition to avoid sudden loading of the primemover, to avoid mechanicaljerk to the shaft, to avoid burning of switch contacts.

In D.C. generators, the brushes on commutator remain in contact with conductors which?

Last Answer : In D.C. generators, the brushes on commutator remain in contact with conductors which lie under interpolar region.

In D.C. generators, current to the external circuit from armature is given through?

Last Answer : In D.C. generators, current to the external circuit from armature is given through commutator commutator.

In D.C. generators the pole shoes are fastened to the pole core by?

Last Answer : In D.C. generators the pole shoes are fastened to the pole core by counter sunk screws.

D.C. generators are installed near the load centres to reduce?

Last Answer : D.C. generators are installed near the load centres to reduce line losses.

D.C. generators are normally designed for maximum efficiency around?

Last Answer : D.C. generators are normally designed for maximum efficiency around full-load.

In DC generators lamination core are generally made of?

Description : In DC generators lamination core are generally made of?

Last Answer : In DC generators lamination core are generally made of silicon steel.

How a three phase three line system can be converted to three phase four line system using Scott connection?

Description : How a three phase three line system can be converted to three phase four line system using Scott connection?

The field coils of D.C. generator are usually made of (a) mica (b) copper (c) cast iron (d) carbon

Description : The field coils of D.C. generator are usually made of (a) mica (b) copper (c) cast iron (d) carbon

Last Answer : Ans: b (b) copper

The resistance of armature winding depends on (a) length of conductor (b) cross-sectional area of the conductor (c) number of conductors (d) all of the above

Description : The resistance of armature winding depends on (a) length of conductor (b) cross-sectional area of the conductor (c) number of conductors (d) all of the above

The armature of D.C. generator is laminated to (a) reduce the bulk (b) provide the bulk (c) insulate the core (d) reduce eddy current loss

Description : The armature of D.C. generator is laminated to (a) reduce the bulk (b) provide the bulk (c) insulate the core (d) reduce eddy current loss

Which of the following could be lamina-proximately the thickness of laminations of a D.C. machine ? (a) 0.005 mm (b) 0.05 mm (c) 0.5 m (d) 5 m

Description : Which of the following could be lamina-proximately the thickness of laminations of a D.C. machine ? (a) 0.005 mm (b) 0.05 mm (c) 0.5 m (d) 5 m

Laminations of core are generally made of (a) case iron (b) carbon (c) silicon steel (d) stainless steel

Description : Laminations of core are generally made of (a) case iron (b) carbon (c) silicon steel (d) stainless steel

List any two Thermal Power Station in Maharashtra with their installed capacity.

Description : List any two Thermal Power Station in Maharashtra with their installed capacity. 

Last Answer :  Thermal Power Station in Maharashtra with their installed capacity :

Diesel generators #1 and #2 are operating in parallel at near full load capacity. Diesel generator #1 suddenly trips out mechanically due to low lube oil pressure. The reverse power relay functions properly and trips generator #1 electrically off the bo A. Start the emergency generator. B. Ascertain cause of the low lube oil pressure. C. Strip the board of all nonvital circuits. D. Secure alarms, reset reverse power relay, and restart #1 engine.

Description : Diesel generators #1 and #2 are operating in parallel at near full load capacity. Diesel generator #1 suddenly trips out mechanically due to low lube oil pressure. The reverse power relay functions ... all nonvital circuits. D. Secure alarms, reset reverse power relay, and restart #1 engine.

Last Answer : Answer: C