Related Questions

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
Dry mix hydraulic compositions of refractory aggregates with suitable bonding materials are called refractory
A Mortars
B Cements
C Castables
D None of these
If a refractory contains high content of silicon, it means refractory is
A Acidic
B Basic
C Neutral
D Brittle
Which of the following bricks has the most close values of RUL and PCE?
A Silica bricks
B Fireclay bricks
C High alumina bricks
D Tar dolomite bricks
Refractoriness under loads (RUL) is quite close to the fusion temperature (PCE) for __________ bricks.
A Fireclay
B Silica
C Dolomite
D Very low alumina
A Thevenin ac equivalent circuit always consists of an equivalent ac voltage source and an equivalent capacitance.
A True
B False
Norton's theorem provides a method for the reduction of any ac circuit to an equivalent form consisting of an equivalent voltage source in series with an equivalent impedance.
A True
B False
Thevenin's theorem provides a method for the reduction of any ac circuit to an equivalent form consisting of an equivalent current source in parallel with an equivalent impedance.
A True
B False
A sector of a circle of radius 5 cm is recast into a right circular cone of height 4 cm. What is the volume of the resulting cone?
A 12π cm2
B 33π cm3
C 32π cm2
D 4π cm2
The height and weighs of a solid cone are 6 cm and 2.7 kg. The weighs of a similar cone of 5 cm height is _____ .
A 9.75 kg
B 9.25 kg
C 6.25 kg
D 5.75 kg

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