Power Engineering - 2


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20 Questions MCQ Test Mock Test Series for SSC JE Mechanical Engineering | Power Engineering - 2

Power Engineering - 2 for SSC 2023 is part of Mock Test Series for SSC JE Mechanical Engineering preparation. The Power Engineering - 2 questions and answers have been prepared according to the SSC exam syllabus.The Power Engineering - 2 MCQs are made for SSC 2023 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Power Engineering - 2 below.
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Power Engineering - 2 - Question 1

Reheating in a gas turbine

Detailed Solution for Power Engineering - 2 - Question 1

Reheating is a method of increasing the mean temperature of heat reception. In this the gas is again heated after it has expanded in the gas turbine. This increases the work output of the turbine by keeping the compressor work constant. By reheating the mean temperature of heat rejection is also increased, resulting in a decrease in the thermal efficiency of the plant.

Power Engineering - 2 - Question 2

When inspection doors on the walls of boilers are opened, flame does not leap out because

Detailed Solution for Power Engineering - 2 - Question 2

The flame does not leap out during opening of inspection door because there is negative pressure in the combustion area. Negative pressure is achieved in balanced draft boilers by using forced draft fans to force air into boiler (pressuring it) and Induced draft fans to remove air from the boilers to create negative pressure

Power Engineering - 2 - Question 3

Boiler rating is usually defined in terms of

Detailed Solution for Power Engineering - 2 - Question 3

Boiler rating is the heating capacity of a steam boiler. It is expressed in BTU per hour (BTU/h), horsepower (hp), or steam output in kg/hr at 100°C’ and atmospheric pressure. Each kilogram of steam receives 2257 kJ of heat from the boiler.

The rating indicates the maximum capacity of a boiler. When a boiler operates at its maximum rated capacity, it is referred to as the maximum load. If the load varies from hour to hour, it operates at a varying load. Load and load variations can influence the amount of chemicals required for treatment and the treatment controls required.

Power Engineering - 2 - Question 4

Cochran boiler is a

Detailed Solution for Power Engineering - 2 - Question 4

It is a multi-tubular vertical fire tube boiler having numbers of horizontal fire tubes. It is the modification of a simple vertical boiler where the heating surface has been increased by means of numbers of fire tubes.

Power Engineering - 2 - Question 5

Coke is produced by

Detailed Solution for Power Engineering - 2 - Question 5

Coke is produced by heating coal for several hours to high temperature (T ≈ 1000‐1100oC) out of contact of air until all volatile matters are removed. The process is called “carbonization” or Destructive distillation of coal”

Power Engineering - 2 - Question 6

Which solution is used in ice plant?

Detailed Solution for Power Engineering - 2 - Question 6

There are three main circuits of working medium in ice plant:

Refrigeration circuit: Ammonia as working medium (primary refrigerant) which produces the cold by changing its phase at different location.

Cooling water circuit: Cooling water as working medium to remove the heat of condenser.

Brine circuit: Brine solution as working medium which transfers the cold from ammonia to water filled cans where ice is to be formed.

Power Engineering - 2 - Question 7

Rotary compressor is used in those cases where:

Detailed Solution for Power Engineering - 2 - Question 7

Power Engineering - 2 - Question 8

Joule cycle is used in:

Detailed Solution for Power Engineering - 2 - Question 8

Gas turbines operate on Brayton cycle/Joule cycle. The Joule cycle consists of four internally reversible processes:

  • Isentropic compression (in a compressor)
  • Constant-pressure heat addition
  • Isentropic expansion (in a turbine)
  • Constant-pressure heat rejection
Power Engineering - 2 - Question 9

What is a load curve?

Detailed Solution for Power Engineering - 2 - Question 9

A load curve, also known as load profile, is a chart illustrating the variation of electrical load over a period of time. Generating companies or electrical utilities use this chart to study the pattern of load variation and to obtain information regarding the amount of power to be generated at a specific time.

Power Engineering - 2 - Question 10

A gas turbine plant working on Joule cycle produces 4000 kW of power. If its work ratio is 40%, what is the power consumed by the compressor in (kW

Detailed Solution for Power Engineering - 2 - Question 10

 

∴WC=WT−Wnet=10000−4000=6000kW

Power Engineering - 2 - Question 11

In Bryton cycle, heat addition is a________.

Detailed Solution for Power Engineering - 2 - Question 11

Brayton cycle is a theoretical cycle for gas turbines. This cycle consists of two reversible adiabatic or isentropic processes and two constant pressure processes. The heat addition and rejection takes place at constant pressure.

Power Engineering - 2 - Question 12

In a 50% reaction stage of a gas turbine

Detailed Solution for Power Engineering - 2 - Question 12

R = static enthalpy change in rotor/static enthalpy change in stage

ΔhR = 0.5 ΔhR + 0.5 ΔhS

ΔhR = ΔhS

Power Engineering - 2 - Question 13

The compressor does not form a part of

Detailed Solution for Power Engineering - 2 - Question 13

A deceleration of the air from Mach number 3 at diffuser inlet to Mach 0.3 in combustion chamber causes the pressure ratio to rise to more than 30. Due to shock and other losses inevitable at such velocities of the pressure rise is not available at the required combustion pressure. This principle of ram pressure rise is used in the ramjet engines. Thus compressor does not form a part of ramjet.

Power Engineering - 2 - Question 14

The primary fuel used in nuclear power plants is

Detailed Solution for Power Engineering - 2 - Question 14

Uranium-235, enriched to about 5% from its naturally occurring level of 0.7% is used as primary fuel in the nuclear power plants.

Power Engineering - 2 - Question 15

Which of the following is the non-positive displacement compressor?

Detailed Solution for Power Engineering - 2 - Question 15

Example of non-positive displacement compressor :

i) Centrifugal compressor

ii) Axial flow compressor

iii) Dynamic compressor

iv) Blade comrpessor

Power Engineering - 2 - Question 16

The once-through boiler is

Detailed Solution for Power Engineering - 2 - Question 16

The Benson boiler employs forced circulation and has a unique characteristic of the absence of steam separating drum. The entire process of heating, steam formation and superheating is done in a continuous tube and accordingly it is called as once-through boiler.

Power Engineering - 2 - Question 17

Free air is air at

Detailed Solution for Power Engineering - 2 - Question 17

Free air delivered is a term used to compare the handling capacity of different compressors. It is volume of air when converted to 1 bar pressure and 15°C.

Power Engineering - 2 - Question 18

In an impulse turbine, the pressure drops

Detailed Solution for Power Engineering - 2 - Question 18

In impulse turbine pressure drop takes place only in the nozzle. There is no pressure drop either in moving or in fixed blades. The pressure in the moving and fixed blades remains constant.

Power Engineering - 2 - Question 19

The efficiency of jet engine is

Detailed Solution for Power Engineering - 2 - Question 19

For turbo jet engines the efficiency is higher for higher speeds. Whereas in turbo prop engines it first increases then decreases.

Power Engineering - 2 - Question 20

For minimum work input in a two-stage compression process the intermediate pressure is the

Detailed Solution for Power Engineering - 2 - Question 20

For minimum work input during compression precess,

 

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