Related Questions

A steam carraying 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
An insulating refractory brick should have high porosity and low thermal conductivity. Which of the following is not used for inducing porosity in the insulating refractory bricks during its manufacture?
A Cork
B Saw dust
C Sand
D Chemically prepared foam
In case of D.C. machine winding, number of commutator segments is equal to
A Number of armature coils
B Number of armature coil sides
C Number of armature conductors
D Number of armature turns
The commutator segments are connected to the armature conductors by means of
A Copper lugs
B Resistance wires
C Insulation pads
D Brazing
What device separates a single network into two segments but lets the two segments appear as one to higher protocols?
A Switch
B Bridge
C Gateway
D Router
Which of the following is the most widely used insulating material for steam carray-ing pipelines?
A Ceramic fibre blanket
B Glass wool and 85% magnesia
C Vermiculite
D Slag wool
Which of the following is the most widely used heat insulating material for pipelines carrying steam?
A Tar dolomite bricks followed by asbestos
B Fireclay refractory followed by aluminium sheet
C Cotton followed by aluminium foil
D 85% magnesia cement and glass wool
The material for commutator brushes is generally
A Mica
B Copper
C Cast iron
D Carbon
The insulating material for a cable should have
A Low cost
B High dielectric strength
C High mechanical strength
D All of the above
The insulating material for cables should
A Be acid proof
B Be non-inflammable
C Be non-hygroscopic
D Have all above properties

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