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The resistance of a wire is 126.48ohms at 100°C and 100ohms at 30°C.
Determine the temperature coefficient of copper at 0°C.
The electromotive force of a standard cell is measured with a
potentiometer that gives a reading of 1.3562V. When a 1.0 megaohm
resistor is connected across the standard cell terminals, the
potentiometer reading drops to 1.3560V. What is the internal resistance of the standard cell
A 1.0 mm diameter wire is maintained at a temperature of 360◦C and exposed to a convection environment at 40◦C with h=120 W/m2·◦C. Calculate the thermal conductivity that will just cause an insulation thickness of 0.25 mm to produce a “critical radius.” How much of this insulation must be added to reduce the heat transfer by 26.8 percent from that which would be experienced by the bare wire?
In a quick return motion mechanism of a Crank and slotted lever type the ratio of maximum velocities is 2.if the length of stroke is 25cm find(1) the length of the slotted lever,
(2)the ratio of time of cutting and written stroke and (3) the maximum cutting velocity per second if the Crank rotates is 30 r.p.n
In a quick return motion mechanism of a Crank and slotted Lever type the ratio of maximum velocities is 2
Fig shows a mechanism in which the hydraulic actuator O2A
is expanding at a constant rate of 10 cm / sec. Determine
the directions and magnitudes of angular velocity and
acceleration of link O4A.
A reciprocating roller follower has cycloidal motion and its stroke of 30 mm is completed in 90°of the cam rotation. The follower is offset against the direction of rotation by 6.25 mm and radius of the roller is 12.5 mm. determine the base circle radius which would limit the pressure angle to 30°
In a crank and slotted lever quick return motion mechanism, the ratio of maximum
velocity at return stroke to the maximum velocity at cutting stroke is 2. If 25cm is the
stroke length, find (a) slotted lever length, (b) the ratio of time of cutting to return
strokes, (c) If the crank rotates at 30rpm, what is the maximum cutting velocity per
sec.
A reciprocating roller follower has cycloidal motion and its
stroke of 30 mm is completed in 90°of the cam rotation.
The follower is offset against the direction of rotation by
6.25 mm and radius of the roller is 12.5 mm. determine the
base circle radius which would limit the pressure angle to
30°.
In the mechanism shown in fig., the crank O2A makes 300
r.p.m in the conte clock wise direction as shown. Find
(i) Angular velocity of link O1A. (ii) Velocity of slider at B.
