PIPE 4TH

Which one of the following statements is correct?

• The sensible heat gain is due to the difference in humidity

• The latent heat gain is due to the temperature difference between the fresh air and the air in space

• The heat gain through the walls of ducts carrying conditioned air through unconditioned space in the building adds to the sensible heat gain

• Maximum heat gain to a building occurs through walls

The sequence of absorption in flue gas analysis by Orsat’s apparatus is respectively ________.

• CO2, O2, CO

• CO, O2, CO2

• CO2, CO, O2

• O2, CO2, CO

Which of the following is given as a result of proximate analysis of coal?

• various chemical constituents, carbon, hydrogen, oxygen and ash

• fuel constituents as percentage by weight, of moisture, volatile, fixed carbon and ash

• percentage by weight, of moisture, volatile matter, fixed carbon and ash

• percentage of chemical constituents including carbon, hydrogen and oxygen

In power plant economics, the ratio of the average load to the peak load over a designated period of time is called ________.

• load factor

• generated factor

• diversity factor

• power factor

What is the standard condition for air?

• 21°C, 101.325 kPa and relative humidity 36%

• at 15°C and 1kg/cm2

• at 0°C and standard atmospheric conditions

• at atmospheric conditions at any specific location

A thermodynamic system is said to be closed if ________.

• both mass and energy cross the system boundary

• only energy and work transfer takes place across system boundary without any mass transfer

• only mass transfer takes place across the system boundary

• neither mass nor energy transfer takes place across system boundary

When a system undergoes through a number of different processes and finally returns to its initial state then it is known as ________.

• a thermodynamic process

• a thermodynamic cycle

• a thermodynamic system

• a non-cyclic process

The ideal thermodynamic cycle on which the gasoline or petrol engine work is ________.

• Otto cycle

• Joule cycle

• Rankine cycle

• Stirling cycle

Thermal conductivity of solid metals ________ if the temperature is increased.

• decreases

• increases

• remains same

• unpredictable

Heat conduction in gases is due to ________.

• electromagnetic waves

• motion of electrons

• elastic impact of individual molecules