Chemical Engineering Basics

91. According to maximum shear stress failure criterion, yielding in material occurs, when the maximum shear stress is equal to __________ times the yield stress.

1. 0.5
2. 2
3. √2
4. √3/2

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92. According to thermodynamic Fahrenheit scale, the fundamental interval between ice point to steam point is

1. 180°
2. 212°
3. 32°
4. 273°

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93. Addition of __________ to steel does not help in improving its machinability.

1. Sulphur
2. Silicon
3. Lead
4. Phosphorous

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94. Addition of __________ to steel does not impart hardness.

1. Nickel
2. Copper
3. Chromium
4. Silicon

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95. Addition of silicon to cast iron

1. Promotes graphite module formation
2. Improves its ductility
3. Does not promote graphite flakes formation
4. Increases the fluidity of molten metal

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96. Addition of small amount of __________ to grey cast iron is done to produce nodular grey cast iron.

1. Manganese
2. Phosphorous
3. Magnesium
4. Chromium

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97. Adhesives

1. Can’t be used in the form of pressure sensitive tapes
2. Can’t join two dissimilar metals
3. Cure instantaneously after application on a surface
4. None of these

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98. Age hardening is connected with

1. Babbitt metal
2. Gun metal
3. Stainless steel
4. Duralumin

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99. Air intake for an air compressor should be preferably taken from

1. A site, where cooling towers are located nearby
2. A site, where open coal yard in located nearby
3. An air conditioned room maintained at a temperature of 18°C
4. An outside atmosphere at 10°C

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100. Air standard Otto cycle is more efficient than the diesel cycle for the same

1. Heat addition & compression ratio
2. Heat addition & pressure
3. Compression ratio & pressure
4. Cylinder dimension & rpm

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