One kg of ethylene (C2 H4 ) requires 2 kg of oxygen and produces 7 22 kg of carbon dioxide and __________ kg of water or steam.
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1 kgf/cm2 is equal to
A. 760 mm Hg
B. Zero mm Hg
C. 735.6 mm Hg
D. 1 mm Hg
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Work done is zero for the following process
A. Constant volume
B. Free expansion
C. Throttling
D. All of the above
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The fuel mostly used in blast furnace for extracting pig iron from iron ores is
A. Hard coke
B. Soft coke
C. Pulverized coal
D. Bituminous coal
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On weight basis, air contains following parts of oxygen
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On volume basis, air contains following parts of oxygen
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A gas is compressed in a cylinder by a movable piston to a volume one half its original volume. During the process 300 kJ heat left the gas and internal energy remained same. The work done on gas in Nm will be
A. 300 Nm
B. 300,000 Nm
C. 30 Nm
D. 3000 Nm
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Gases have
A. Only one value of specific heat
B. Two values of specific heat
C. No value of specific heat
D. Under some conditions one value and sometimes two values of specific heat
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According to Dalton's law, the total pressure of the mixture of gases is equal to
A. Greater of the partial pressures of all
B. Average of the partial pressures of all
C. Sum of the partial pressures of all
D. Sum of the partial pressures of all divided by average molecular weight
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When a gas is heated, change takes place in
A. Temperature
B. Pressure
C. Volume
D. All of these
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A sudden fall in the barometer reading is a sign of approaching
A. Fine weather
B. Rains
C. Storm
D. Cold wave
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If heat be exchanged in a reversible manner, which of the following property of the working substance will change accordingly
A. Temperature
B. Enthalpy
C. Internal energy
D. Entropy
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A path 1-2-3 is given. A system absorbs 100 kJ as heat and does 60 kJ of work while along the path 1-4-3, it does 20 kJ of work. The heat absorbed during the cycle 1-4-3 is
A. -140 kJ
B. -80 kJ
C. -40 kJ
D. +60 kJ
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One molecule of oxygen is __________ times heavier than the hydrogen atom.
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The oxygen atom is ________ times heavier than the hydrogen atom.
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Heat and work are
A. Point functions
B. System properties
C. Path functions
D. Intensive properties
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During throttling process
A. Heat exchange does not take place
B. No work is done by expanding steam
C. There is no change of internal energy of steam
D. All of the above
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Universal gas constant is defined as equal to product of the molecular weight of the gas and
A. Specific heat at constant pressure
B. Specific heat at constant volume
C. Ratio of two specific heats
D. Gas constant
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The index of compression ‘n’ tends to reach ratio of specific heats ‘y’ when
A. Flow is uniform and steady
B. Process is isentropic
C. Process is isothermal
D. Process is isentropic and specific heat does not change with temperature
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The fuel mostly used in cement industry and in metallurgical processes is
A. Wood charcoal
B. Bituminous coke
C. Pulverized coal
D. Coke
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