Basic open hearth furnace (BOF) is not used for producing ______________ steel?
(A) Killed
(B) Rimming
(C) High alloy
(D) None of these
______________ circuit is most commonly used to measure strain with the help of a strain gauge?
(A) Ballast
(B) Voltage balancing potentiometric
(C) Simple current sensitive
(D) None of these
Lead is poured into the joint between two _______________ pipes ?
(A) Mild steel
(B) Concrete
(C) Cast iron
(D) Asbestos cement
Co-efficient of performance of a Carnot cycle refrigerator operating between – 23°C and + 27°C is ________________?
(A) 3
(B) 5
(C) 0.5
(D) 1.5
Unit of surface tension in S.I. unit is_________________?
(A) Watt/m
(B) Joule/m2
(C) Newton/m2
(D) Joule/m
The noble metals________________?
(A) Are exemplified by Na, K and Li
(B) Do not resist corrosion very strongly
(C) Are the lowermost in the electro-chemical series of metals
(D) None of these
Which of the following is the most suitable abrasive for grinding high tensile strength materials ?
(A) Silicon carbide
(B) Corundum
(C) Aluminium oxide
(D) Boron carbide
Which of the following is an unconventional source of energy ?
(A) Thermal power
(B) Hydroelectric power
(C) Nuclear-fusion power
(D) Solar power
Wave length of X-rays is about 1 angstrom; however it cannot pass through a sheet of ________________?
(A) Paper
(B) Cloth
(C) Lead
(D) Aluminium
For infinite parallel planes having emissivities ε1 & ε2, the interchange factor for radiation from surface 1 to surface 2 is given by__________________?
(A) (ε1 + ε2)/ε1.ε2
(B) ε1.ε2/(ε1 + ε2 – ε1.ε2)
(C) ε1.ε2
(D) ε1 + ε2