What is the energy of a thermal neutron?

What is the energy of a thermal neutron? 
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1 Answer

Answer :

0.025 eV (energy volt)  
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Velocity of the thermal neutron (< 0.025 eV) used for fission of U-235 is around __________ m/sec. (A) 1 (B) 2200 (C) 3 × 10 11 (D) 9 × 10 21

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Which power plant has minimum operating cost? a) Hydroelectric power plant b) Thermal power plant c) Nuclear power plant d) Gas Turbine Power Plant Ans: A 42. Which of the following have highest operating cost? a) Hydroelectric power plant b) Thermal power plant c) Nuclear power plant d) Solar electric power plant

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The illustrated motor fails to start and gives a loud hum when the start button is depressed, your first action should be to __________. EL-0007 A. disassemble the motor to fix the centrifical switch so the start windings will be energized B. push the stop button to deenergize the 'M' coil C. reset the thermal overload D. hold the 'M' contactor closed by hand while wearing electrical safety gloves to get motor started

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The arc resulting from the tripping of a circuit breaker is prevented from damaging the contacts by _____________. A. designing the contacts to open slowly B. directing the arc into an arc chute C. an inverse timed thermal trip for short circuit currents D. instantaneous magnetic trip for overload currents

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If a delicate component must be soldered into a circuit, the component may be protected from the heat of the soldering process by _____________. A. operating the soldering gun not more than 60 seconds at a time B. using a thermal shunt C. pre-oxidizing the leads to be soldered D. coating the leads to be soldered with a light oil film

Description : If a delicate component must be soldered into a circuit, the component may be protected from the heat of the soldering process by _____________. A. operating the soldering gun not more than 60 seconds at ... oxidizing the leads to be soldered D. coating the leads to be soldered with a light oil film

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Which of the following actions can be carried out in order to prevent thermal runaway in a transistor? A. Increase the current through the collector-base junction. B. Install a heat sink. C. Shift the 'Q' point to increase collector current. D. Increase the potential difference between the emitter and the base.

Description : Which of the following actions can be carried out in order to prevent thermal runaway in a transistor? A. Increase the current through the collector-base junction. B. Install a heat sink. ... point to increase collector current. D. Increase the potential difference between the emitter and the base.

Last Answer : Answer: B

Line losses in a distribution circuit are kept to a minimum by __________. A. adding rubber insulation conductors to the circuit B. using higher current and lower voltage C. increasing the number of thermal relays in the circuit D. using higher voltage and lower current

Description : Line losses in a distribution circuit are kept to a minimum by __________. A. adding rubber insulation conductors to the circuit B. using higher current and lower voltage C. increasing the number of thermal relays in the circuit D. using higher voltage and lower current

Last Answer : Answer: D

A circuit is protected from overheating by a/an ___________. A. pyrometer B. thermal overload relay C. magnetic contactor D. overload transformer

Description : A circuit is protected from overheating by a/an ___________. A. pyrometer B. thermal overload relay C. magnetic contactor D. overload transformer

Last Answer : Answer: B

A three-phase, induction-type motor experiences an open in one phase. Which of the listed automatic protective devices will prevent the machine from being damaged? A. Overspeed trip B. Thermal overload relay C. Three-pole safety switch D. Magnetic blowout coil

Description : A three-phase, induction-type motor experiences an open in one phase. Which of the listed automatic protective devices will prevent the machine from being damaged? A. Overspeed trip B. Thermal overload relay C. Three-pole safety switch D. Magnetic blowout coil

Last Answer : Answer: B

Fuses placed in series with a thermal trip-type circuit breaker are used for _____________. A. time-delay protection B. short-circuit protection C. short duration surge protection D. sustained overload protection

Description : Fuses placed in series with a thermal trip-type circuit breaker are used for _____________. A. time-delay protection B. short-circuit protection C. short duration surge protection D. sustained overload protection

Last Answer : Answer: B

The main difference between a motor control circuit containing low voltage protection and low voltage release is that the latter contains _____________. A. a magnetic operating coil B. normally open line contacts C. thermal-overload protection D. a momentary-contact start button

Description : The main difference between a motor control circuit containing low voltage protection and low voltage release is that the latter contains _____________. A. a magnetic operating coil B. normally open line contacts C. thermal-overload protection D. a momentary-contact start button

Last Answer : Answer: D

In a cartridge-type fuse, the metal element is contained in a ___________________. A. porcelain window B. thermal cut out C. fiber tube D. flasher device

Description : In a cartridge-type fuse, the metal element is contained in a ___________________. A. porcelain window B. thermal cut out C. fiber tube D. flasher device

Last Answer : Answer: C

Protection against sustained overloads occurring in molded-case circuit breakers is provided by a/an __________. A. overvoltage release B. thermal acting trip C. thermal overload relay D. current overload relay

Description : Protection against sustained overloads occurring in molded-case circuit breakers is provided by a/an __________. A. overvoltage release B. thermal acting trip C. thermal overload relay D. current overload relay

Last Answer : Answer: B

Where a thermal-acting breaker is required to be used in an area of unusually high, low, or constantly fluctuating temperatures, an ambient compensating element must be used. This element consists of a ______________. A. cylindrical spring on the contact arm B. conical spring on the contact arm C. second bimetal element D. second electromagnet

Description : Where a thermal-acting breaker is required to be used in an area of unusually high, low, or constantly fluctuating temperatures, an ambient compensating element must be used. This element consists of ... arm B. conical spring on the contact arm C. second bimetal element D. second electromagnet

Last Answer : Answer: C

What are different types of circuit breakers employed in thermal power plant?

Description : What are different types of circuit breakers employed in thermal power plant?

Last Answer : Answer: For low voltage operation 415/220V vacuum circuit breakers or air break circuit breakers are employed. For voltage ratings about 6.6kV and beyond SF6 circuit breakers are employed.

How Generator Transformer is cooled in Thermal Power Plant?

Description : How Generator Transformer is cooled in Thermal Power Plant?

Last Answer : Answer: MVA power rating of the Generator Transformer will be equal to the alternator. Hence lot of heat will be generated while generator transformer is under operation. Oil Forced Air Forced (OFAF) type of cooling is employed for generator transformer

What are the different Generator Protections employed in Thermal Power Plants?

Description : What are the different Generator Protections employed in Thermal Power Plants?

Last Answer : Answer: Faults in the windings, Over load protection, Over heating of windings or bearings, Over speed protection, Loss of Excitation protection, Motoring operation protection, Inadvertent ... , out of step operation protection, sub-synchronous oscillations protection and earth fault protection

What are the major electric systems in Thermal Power Plant?

Description : What are the major electric systems in Thermal Power Plant?

Last Answer : Answer: Major electrical equipment in thermal power plant are • Turbine Generator • Exciter System • Generator Protection System • Generator Transformer • HT/LT switch gear • Electrical Switch-yard

What is the largest pump in the thermal power plant?

Description : What is the largest pump in the thermal power plant?

Last Answer : Answer: In thermal power plant Boiler Feed Pump (BFP) is the largest pump, it delivers the water to the boiler.

What are different types of Steam boilers used in Thermal Power Plants?

Description : What are different types of Steam boilers used in Thermal Power Plants?

Last Answer : Answer: Different type of boiler used in thermal power plants are: • Fire tube boiler • Water tube boiler • Natural Circulation boiler • Forced Circulation boiler • Once through boiler

What are different types of circuit breakers employed in thermal power plant?

Description : What are different types of circuit breakers employed in thermal power plant?

Last Answer : For low voltage operation 415/220V vacuum circuit breakers or air break circuit breakers are employed. For voltage ratings about 6.6kV and beyond SF6 circuit breakers are employed.

How Generator Transformer is cooled in Thermal Power Plant?

Description : How Generator Transformer is cooled in Thermal Power Plant?

Last Answer : MVA power rating of the Generator Transformer will be equal to the alternator. Hence lot of heat will be generated while generator transformer is under operation. Oil Forced Air Forced (OFAF) type of cooling is employed for generator transformer

What are the different Generator Protections employed in Thermal Power Plants?

Description : What are the different Generator Protections employed in Thermal Power Plants?

Last Answer : Faults in the windings, Over load protection, Over heating of windings or bearings, Over speed protection, Loss of Excitation protection, Motoring operation protection, Inadvertent energisation ... , out of step operation protection, sub-synchronous oscillations protection and earth fault protection

What are the major electric systems in Thermal Power Plant?

Description : What are the major electric systems in Thermal Power Plant?

Last Answer : Major electrical equipment in thermal power plant are Turbine Generator Exciter System Generator Protection System Generator Transformer HT/LT switch gear Electrical Switch-yard

On what factors efficiency (thermal) of the steam plant depends?

Description : On what factors efficiency (thermal) of the steam plant depends?

Last Answer : Efficiency of the thermal plant depends on three factors, they are pressure of steam entering the turbine temperature of the steam entering the turbine pressure in the condenser Thermal efficiency ... as low as possible. Thermal efficiency also increases by reheating the steam between turbine stages