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
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
Refractory materials are never used in the construction of
A Segar cones
B Orton cones
C Pressure vessels
D Ovens & retorts
Thoria is an expensive refractory material and is radioactive in nature. Thorium oxide is used in the manufacture of
A Segar cones
B Muffles for muffle furnaces
C Insulating bricks
D Crucibles used for melting of high purity metals
High thermal conductivity of a refractory material is not important, when it is to be used in the
A Coke oven regenarators
B Muffle furnace
C Blast furnace
D Recuperators
Antonym of 'Refractory' is:
A Stubborn
B Obedient
C Intractable
D Cussed
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

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