Silicon crystal can be converted to p-type semi-conductor by doping with__________________?

A. Phosphorous
B. Nitrogen
C. Carbon
D. Boron

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)

Minimum thermal efficiency of a steam boiler may be around ____________________ percent ?

A. 25
B. 45
C. 65
D. 20

Eutectic reaction for iron-carbon system occurs at a temperature of _______________ °C ?

A. 723
B. 959
C. 1147
D. 1493

Consider the equilibrium A(g) + B(g) = AB(g). When the partial pressure of A is 10-2 atm, the partial pressure of B is 10-3 atm and the partial pressure of AB is 1 atm, the equilibrium constant ‘K’ is____________________?

A. 10 atm-1
B. 105 atm-1
C. 10 (dimensionless)
D. 105 (dimensionless)

Tesla metre per ampere (T. m/A) is the unit for the measurement of_______________?

A. Magnetic susceptibility
B. Magnetic moment
C. Permeability of free space
D. Flux density

The joint for soldering is supported by binding wire made of ____________________?

A. Mild steel
B. Copper
C. Soft iron
D. Stainless steel

The bolt is subjected to _______________ when the nut is tightened by putting the washer beneath it?

A. Tension
B. Shear
C. Compression
D. Bending & tension

Which of the following is not a characteristic observed in material failure by fatigue fracture ?

A. Plastic deformation of material does not occur
B. Initiation of crack from below the surface does not occur
C. Initiation of crack occurs on the surface of the machine part
D. Presence of both rough & smooth zone with conchoidal markings in smooth zone of the

Leakage in a cooking gas cylinder is detected by___________________?

A. Radio-isotopes
B. Pouring soap solution on the surface and locating the gas bubbles
C. Halide torch
D. Pungent smell of mercaptans present in the gas