Minimum thermal efficiency of a steam boiler may be around ____________________ percent ?
(A) 25
(B) 45
(C) 65
(D) 20
Corona discharge is related to the operation of a/an_______________________?
(A) Induction motor
(B) Electrostatic precipitator
(C) Fast breeder reactor
(D) Magneto hydrodynamic generator (MHD)
Silicon crystal can be converted to p-type semi-conductor by doping with__________________?
(A) Phosphorous
(B) Nitrogen
(C) Carbon
(D) Boron
Which of the following is normally not found in both the S.I. (petrol) & C.I. (diesel) engines ?
(A) Air filter
(B) Fuel injector
(C) Exhaust silencer
(D) Battery
Vibration upto 100 kilo hertz can be most accurately measured by a ________________ type accelerometer ?
(A) Preloaded spring
(B) Piezoelectric
(C) Bonded strain gauge
(D) None of these
Brinell Hardness Number (BHN) for talc is approximately in the range of ____________________?
(A) 1-5
(B) 20-30
(C) 100-150
(D) 200-250
Pressure exerted by a liquid depends upon its_________________?
(A) Surface tension
(B) Density
(C) Viscosity
(D) Buoyancy
Drills are usually made of__________________?
(A) Cermets
(B) High speed steel
(C) Alloy steel
(D) Tungsten carbide
An ideal material for making cooking vessels should have___________________?
(A) High heat capacity
(B) Low heat capacity
(C) High thermal conductivity
(D) Both
Propulsion of rocket follows from the_________________?
(A) Newton’s second law of motion
(B) Newton’s third law of motion
(C) Law of projectiles
(D) Archimedes principle