Related Questions

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
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
Refractory period in the ventricles corresponds to the
A Period of ventricular contraction
B Period of ventricular action potential
C QRS complex of ECG
D PR interval of ECG
E ST segment of ECG
Refractory period in the ventricles
A Decreases during sympathetic stimulation of the heart
B Corresponds to the period of ventricular contraction
C Corresponds to the QRS complex of ECG
D Corresponds to the period of ventricular action potential
E Is shorter than the skeletal muscle
Absolute refractory period in the ventricles
A Corresponds to the period of ventricular depolarization.
B Corresponds to the period of ventricular contraction.
C Is the period when the ventricles are completely unexcitable.
D Is shorter than the corresponding atrial muscle.
E Decrease during stimulation of the vagus nerve to the heart.
Fusion point of an acidic refractory material is
A Increased by the addition of basic oxides
B Reduced by the addition of basic oxides
C Not affected by the addition of basic oxides
D Not affected by the addition of basic oxides
Which of the following is not a high alumina refractory material?
A Kyanite
B Sillimanite
C Diaspore
D Periclase
Which of the following will happen if the thickness of refractory wall of furnace is increased?
A Heat loss through furnace wall will increase
B Temperature inside the furnace will fall
C Temperature on the outer surface of furnace walls will drop
D Energy consumption will increase
Refractory bricks having high thermal conductivity is desirable, when it is to be used in the
A L.D. converter
B Blast furnace
C Rotary kiln
D Recuperator

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