Related Questions

The moment of inertia of a circular lamina of diameter ‘d’, about an axis perpendicular to the plane of the lamina and passing through its centre, is
A $$\frac{{\pi {{\text{d}}^4}}}{{12}}$$
B $$\frac{{\pi {{\text{d}}^4}}}{{16}}$$
C $$\frac{{\pi {{\text{d}}^4}}}{{24}}$$
D $$\frac{{\pi {{\text{d}}^4}}}{{32}}$$
E $$\frac{{\pi {{\text{d}}^4}}}{{36}}$$
The thickness of laminations used in a transformer is usually
A 0.4 mm to 0.5 mm
B 4 mm to 5 mm
C 14 mm to 15 mm
D 25 mm to 40 mm
The laminations of the armature of a D.C. machine are usually _____ thick.
A 0.1 to 0.2 mm
B 0.2 to 0.3 mm
C 0.3 to 0.4 mm
D 0.4 to 0.5 mm
Laminations of core are generally made of
A Case iron
B Carbon
C Silicon steel
D Stainless steel
The degree of mechanical vibrations produced by the laminations of a transformer depends on
A tightness of clamping
B gauge of laminations
C size of laminations
D all of the above
The transformer laminations are insulated from each other by
A mica strip
B thin coat of varnish
C paper
D any of the above
The noise resulting from vibrations of laminations set by magnetic forces, is termed as
A Magnetostriction
B Boo
C Hum
D Zoom
A machine P can print out one lakh books in 8 hours. Machine Q can print the same number of books in 10 hours while machine R can print them in 12 hours. All the machines are started at 9 A.M.While machine P is stopped at 11 A.M. and remaining two machines completed the work. Approximately at what at what time will the work time (to print one lakh books) be finished?
A 11.30 Am
B 12 Noon
C 12.30 Pm
D 11.35 am
A small factory with 3 machines has a job of stamping out a number of pan covers. The newest machine can do the job is 3 days, another machine can do it in 4 days, and the third machine can do it in 6 days. How many days will the factory take to do the job using all the machine?
A 1.333
B 4.333
C 6
D 13
A machine P can paint one lakh books in 8 hours; machine Q can print the same number of books in 10 hours while machine R can print them in 12 hours. All the machines started operating at 9 A. M. while machine P is stopped at 11 A. M. and the reamaining two machines completed the work. Approximately at what time will the work (to print one lakh books) be finished?
A 11:30 A. M
B 12:00 noon
C 12:30 P. M.
D 1:00 P. M.

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