Related Questions

Circular areas of same size have been marked to drill holes in a road. If the radius of one of the holes to be drilled is 21cm, and there are 10 holes to be drilled along the road, what is the total area in sq.cm of all the 10 circles marked to be drilled? (π = 22 / 7)
Which of the following statements are correct? A. Laser printers use dry ink B. Unlike dot matrix and inkjet printers, laser printers do not use ink when producing a document C. Laser printers use the property of static electricity D. Laser printers produce ozone gas and tiny toner particulates in the air Choose the correct answer from the options given below
Drilled holes and honed holes could be designated by which of the following grades?
Number of holes drilled per second depends on the holes diameter.
How much amount of tapers are occurred in Laser drilled holes?
The correct statements are A. We can not see a bird’s ears. A bird has tiny holes on both sides of its head. B. Generally, the holes are covered with feathers. C. You will see tiny holes on a lizard’s head. These are its ears. D. A crocodile also has ears like this, but we can not see them easily. 
Consider the following statements in connection with deflection-type and null-type instruments: 1. Null-type instruments are more accurate than the deflection-type ones. 2. Null-type of instrument can be highly sensitive compared to a deflection-type instrument. 3. Under dynamic conditions, null-type instruments are less preferred to deflection-type instruments. 4. Response is faster in null-type instruments as compared to deflection-type instruments. Which of the above statements are correct?
In a punching press, the requirement is to punch 40 mm diameter holes in a plate having a thickness of 15 mm. The rate at which the holes should be punched is 30 holes/min. Energy requirement is of 6 N-m per mm2 of sheared area. If the punching takes time 1/10 of a second and the speed of the flywheel varies from 160 to 140 rpm, determine the mass of the flywheel having radius of gyration of 1 m.
In a semiconductor it is observed that three-quarters of the current is carried by electrons and one quarters by holes. If the drift speed is three times that of the holes, what is the ratio of electrons to holes?
What is the maximum depth up to which holes can be drilled using LBM?