Q. An optical gauge works on the principle of
1) Interference of light
2) Reflection
3) Dispersion
4) Polarisation
Q. A fluorescent tube contains
1) Argon
2) Nitrogen
3) Neon
4) Oxygen
Q. The feeding of a job in planner is done by
1) Table movement
2) Tool movement
3) Ram movement
4) Movement of a clapper box
Q. Which of the following machines utilises fly cutters?
1) Planner
2) Milling machine
3) Lathe machine
4) Shaper
Q. Crater wear takes place in single point cutting tool at
1) Flank
2) Rake
3) Side
4) Both Flank & Rake
Q. It is difficult to magnetise steel because of its
1) Low permeability
2) High retentivity
3) High permeability
4) High density
Q. In electric machines, laminated cores are used with a view to reduce the
1) Friction loss
2) Copper loss
3) Eddy current loss
4) Hysteresis loss
Q. In DC generators, the brushes are always placed
1) Along the Geometric Neutral Axis (GNA)
2) Along the Magnetic Neutral Axis (MNA)
3) Perpendicular to MNA
4) Perpendicular to GNA
Q. Critical resistance of a DC generator RC is
1) Inversely proportional to speed
2) Proportional to speed
3) Inversely proportional to the square of speed
4) Proportional to the square of speed
Q. If the current and the voltage are out of phase by 90 degree, then the power is
1) Minimum
2) Maximum
3) 1.1 VI
4) Zero
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