Chemical Engineering Basics

681. The taper provided on pattern for its easy & clean withdrawal from the mould is termed as the __________ allowance.

1. Casting
2. Pattern
3. Draft
4. Distortion

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682. The temperature at which ferromagnetic material can no longer be magnetised by the outside forces, is termed as the

1. Critical point
2. Curie temperature
3. Inversion temperature
4. Eutectic temperature

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683. The temperature at which the magnetic property of iron disappears (i.e., it becomes nonmagnetic) and its electrical conductivity & specific heat also changes, is called the 'Curie point', which is __________ °C.

1. 768
2. 908
3. 1400
4. 1539

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684. The thermodynamic law, PV^y = constant, is not followed by the

1. Free expansion of an ideal gas
2. Adiabatic expansion of steam in turbine
3. Adiabatic compression of air
4. Ideal compression of air

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685. The thickness of oxide film is y at time t. If K₁, K₁ and K₁ are the temperature dependent constants, the parabolic law of oxidation is given by

1. y² = 2k₁t + k₂
2. y = k₁ ln (k₂t + k₃)
3. y = k₁ t + k₂
4. y = k₁t³ + k₂

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686. The trace metal present in insulin is

1. Cu
2. Zn
3. Fe
4. Ni

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687. The transition temperature at which all the ferromagnetic materials become paramagnetic materials is termed as the 'Curie temperature'. Its value for cobalt is __________ °C.

1. 768
2. 1127
3. 1359
4. 1480

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688. The two elements required to form substitutional solid solution should not have

1. Same crystalline structure
2. Same valency
3. Widely differing electronegativity
4. Same atomic sizes

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689. The type of pump used for lifting large quantity of sewage is a __________ pump.

1. Gear
2. Centrifugal
3. Reciprocating
4. Plunger

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690. The underground well of a biogas plant is called the

1. Septic tank
2. Oxidation well
3. Digestor
4. Lagoon

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