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4

Dowtherm is a

A. High temperature heating medium (a petroleum product)

B. Product of coal tar distillation

C. Very heat sensitive material

D. None of these

Correct Answer :

A. High temperature heating medium (a petroleum product)


Related Questions

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4

The maximum stress below which a material can withstand an infinite number of cycle of stress, is termed as the

A. Fatigue strength

B. Creep strength

C. Resilience

D. Endurance limit

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4

Load cells used for the measurement of weight has

A. Compact & rugged construction with an accuracy of 0.1 to 1%

B. No moving parts and incurs negligible deflection under load

C. Provision of thermal compensation and is hermetically sealed

D. All 'a', 'b' & 'c'

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4

The majority charge carriers in p-type silicon are

A. Free electrons

B. Ions

C. Conduction electrons

D. Holes

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4

Between 230 and 370°C, blue brittleness is caused in mild steel because of the

A. Immobility of dislocation

B. Strain-ageing

C. Increase in Young's modulus

D. Strain hardening

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4

A steam carrying pipeline is insulated with two layers of insulating materials with the inferior insulation material forming the inner part. If the two insulating layers are interchanged, the heat conducted will

A. Increase

B. Decrease

C. Remain unaffected

D. May increase or decrease; depends on the thickness of each layer

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4

Lead pencil contains

A. Graphite

B. Lead sulphide

C. Lead

D. Both (B) & (C)

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4

Routing in production, planning & control is concerned with the

A. Sequence of operation to be performed

B. Progress of work performed

C. Authorisation of work to be performed

D. Balancing of load on machines

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4

The most suitable material of construction for a sewer to carry sewage under high pressure is

A. Asbestos cement

B. Steel

C. Cement concrete

D. Stoneware

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4

Fatigue limit improvement by over stressing the metal by successively increasing the load is called coaxing. In fatigue failure, the material fails

A. Below the yield point

B. Above the yield point

C. Below the elastic limit

D. At the elastic limit

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4

The main constituent of bones is

A. CaF2

B. Ca3(PO4)2

C. CaCO3

D. CaCl2

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4

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

A. Casting

B. Pattern

C. Draft

D. Distortion

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4

Which of the following contributes maximum as main source of sulphur in the blast furnace charge?

A. Sinter

B. Coke

C. Iron ore

D. Limestone

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4

__________ is not used as a material of construction in thermocouples.

A. Alumel

B. Rhodium

C. Constantan

D. Duralumin

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4

__________ metal is used as a bearing liner material.

A. Pewter

B. White

C. Babbitt

D. Gun

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4

Thermal efficiency of an internal combustion engine is around __________ percent.

A. 8

B. 35

C. 65

D. 80

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4

__________ is used as a material of construction for the blade of power saw.

A. Wrought iron

B. Stainless steel

C. Mild steel

D. High speed steel

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4

Friction factor for fluid flow in pipe does not depend upon the

A. Pipe length

B. Pipe roughness

C. Fluid density & viscosity

D. Mass flow rate of fluid

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4

Unit of viscosity in CGS system is

A.

B.

C.

D.

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4

'Cryogenics' is concerned with the generation & use of low temperature in the range of

A. 0°K to 123°K

B. 0°C to - 123°C

C. 0°C to - 273°C

D. 0°K to 273°K

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4

At the point of boundary layer separation in fluid flow, the

A. Shear stress is maximum

B. Velocity gradient is flat

C. Density variation is maximum

D. Shear stress is zero

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4

Use of water as a manometric liquid suffers from the disadvantage of its

A. Low vapour pressure

B. Corrosive nature

C. High vapour pressure

D. High boiling point

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4

Which of the following is not used as a bearing material?

A. Copper-lead alloys

B. Babbitts

C. Bronzes

D. Cermets

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4

A material is capable of resisting softening at high temperature, because of its property termed as

A. Hot temper

B. Hot hardness

C. Fatigue

D. Creep

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4

Which of the following is not the function of a volute casing provided in a centrifugal pump?

A. To reduce the head loss in discharge

B. To increase the pump efficiency

C. To collect liquid from the periphery of the impeller and to transmit it to the delivery pipe at constant velocity

D. To increase the pump discharge rate

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4

In condensers used in thermal power plants, steam is normally used in shell side and cooling water on the tube side, because of the reason that

A. Compared to the mass flow rate of cooling water, the rate of condensation of steam is invariably smaller

B. Maintaining vacuum on tube side is more difficult than that on the shell side

C. Water velocity can be increased conveniently to increase the overall heat transfer co-efficient because of its lower specific volume compared to steam

D. Condenser can act as a storage unit for condensed steam

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4

Regeneration of molecular sieve requires it to be heated to a temperature of about __________ °C.

A. 80-120

B. 200-300

C. 600-800

D. 1000-1100

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4

Hot extrusion process is not used for making

A. Cast iron pipe for domestic water supply

B. Aluminium curtain rods

C. Stainless steel tubes used in furnitures

D. Any of these

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4

In chemical dehumidification of air

A. Both specific humidity & dry bulb temperature increases

B. Both specific humidity & dry bulb temperature decreases

C. Specific humidity decreases & dry bulb temperature increases

D. Specific humidity increases & dry bulb temperature decreases

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4

The ratio of the shear stress to the principal stress on a principal plane is

A. 0

B. 1

C. 1/2

D. 1/3

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__________ stress cannot be sustained by a fluid in equilibrium.

A. Shear

B. Tensile

C. Compressive

D. None of these