# Large capacity generators are invariably?

Large capacity generators are invariably hydrogen cooled.

## Related questions

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

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

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.

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

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.

Answer : Power plant having maximum demand more than the installed rated capacity will have utilisation factor more than unity.

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

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

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

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

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

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

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

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

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

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

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.

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

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

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

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

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

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

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

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

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

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

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

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

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.

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

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

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

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

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

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

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

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

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

Description : Large size steam plants and nuclear plants are suitable for   (a) Intermediate loads (b) Base loads (c) Both base and peak loads (d) Peak loads

Answer : Large size steam plants and nuclear plants are suitable for Base loads

Description : In large capacity transformers, 5% of the turns at the end of hv winding are provided with extra insulation so as to provide protection  (1) against corona (2) against lightning (3) due to surges occurring during switching operation (4) All of these

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

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

Description : A large hydropower station has a head of 324 metre and an average flow of 1370 metre3 / second. The available hydraulic power from this station will be: A) 4.35 MW B) 4.15 MW C) 4.47 MW D) 4.73 MW

Answer :  A large hydropower station has a head of 324 metre and an average flow of 1370 metre3 / second. The available hydraulic power from this station will be: 4.35 MW

Description : The following graph represents the installed capacity for cement production (in tonnes) and the actual production (in tonnes) of nine cement plants of a cement company. Capacity utilization of a plant ... difference between total production of large plants and small plants, in tonnes is _____

Description : “Cleistogamous flowers are invariably autogamous because” (a) These flowers do not open at all. (b) There is no chance of cross – pollen landing on the stigma. (c) These flowers have exposed anthers and stigma. (d) These flowers are wind pollinated.

Description : Which one of the following is not a software myth? (A) Once we write the program and get it to work, our job is done. (B) Project requirements continually change, but ... not understand how to control software projects internally, it will invariably struggle when it outsources software projects.

Answer : (D) If an organization does not understand how to control software projects internally, it will invariably struggle when it outsources software projects.

Description : The chemical component that is invariably found in all viruses is : (1) proteins (2) lipids (3) DNA (4) RNA

Description : People with Down’s syndrome invariably affected by: (1) Huntington’s disease (2) Alzheimer’s disease (3) Meningitis (4) Brain haemorrhage

Description : In AC. circuits, laminated iron is invariably used in order to?

Answer : In AC. circuits, laminated iron is invariably used in order to reduce eddy current loss.

Description : Shunt generators are most suited for stable parallel operation as their voltage characteristics are (a) drooping (b) identical (c) linear (d) rising

Description : Polyphase generators produce simultaneous multiple sinusoidal voltages that are separated by certain constant: A. Phase -angles B. Frequency C. Voltage D. Current

Answer : Polyphase generators produce simultaneous multiple sinusoidal voltages that are separated by certain constant: Phase -angles

Description : Consider efficiencies of hydro-turbines and generators. If the efficiency of a hydro-turbine is 80% and the efficiency of a generator is 90%, what is the overall efficiency of the unit? w) 85% x) 72% y) 90% z) 70%

Description : Recommend with justification the generators used in SWT.

Answer : 1. Fixed Speed Induction Generator: This is squirrel cage induction generator for fixed speed. This is 1) reliable 2) self-starting 3) easy to adjust 4) have low maintenance.  2. ... optimizes use of given grid capacities 6) Better cooling performance 7) Reduced noise level of moving parts.

Description : List various types of generators used in WPP.

Answer : Various Types of Generators Used in WPP: 1. Squirrel Cage Induction Generator ( SCIG ) 2. Wound Rotor Induction Generator ( WRIG ) 3. Doubly Fed Induction Generator ( DFIG ) 4. Wound Rotor synchronous Generator ( WRSG) 5. Permanent Magnet Synchronous Generator ( PMSG)

Description : Classify different types of generators.

Answer : Different Types of Generators:  1) Separately excited DC generator  2) Self excited DC generator: (i) DC series generator (ii) DC shunt generator (iii) DC Compound generator: short shunt and long shunt / (cumulative or differential)

Description : Two 3-phase synchronous generators with reactance 60% and 40% feed a fault current of 1200 A up to short-circuit fault point. The short-circuit current is (A) 1200 A (B) 2400 A (C) 4000 A (D) 5000 A

Description :  Which of the following generators is used for DC arc welding application ? (A) Series generator (B) Shunt generator (C) Differential compound generator (D) Over -compound generator

Description : In signal generators - a) energy is created b) energy is generated c) energy is converted from a simple DC source into ac energy at some specific frequency d) all the above

Answer : In signal generators - energy is converted from a simple DC source into ac energy at some specific frequency

Description : What is the other name used for DC generators? A. Dynamos B. Alternator C. Capacitor D. Dynamotor

Answer : Dynamos is the other name used for DC generators.

Description : In DC generators, armature reaction is produced by the: (A) field current (B) armature conductors (C) field pole winding (D) load current in armature

Answer : In DC generators, armature reaction is produced by the: load current in armature

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