# Posts by Dhilsath

Total # Posts: 12

**Maths**

HOw to calculate CFT of the wooden box?

**Theory of machine**

Fill in the blanks: 1. A disc is spinning with an angular velocity w rad/sec about the axis of pin. The coupled to the causing precession will be ....... 2. The swaying couple is due to the ...... unbalanced force. 3.All pairs are ....... pair in a pantograph. 4.In a ...... ...

**Theory of machine**

A punching machine carries out 5 holes per minute. Each hole of 30 mm dia in 40 mm thick plate requires 10 NM of energy per mm^2 of the sheared area. The punch has a stroke of 90 mm. find the power of the motor required if the mean speed of the flywheel if 20 m/s. If the total...

**Heat Transfer**

2.Emissivity 3.high 5.Electromagnetic

**Heat Transfer**

Fill In the Blanks: 1.The physical significance of ....... is that it tells us how fast heat is propogated or it diffuses through a material during changes of temperature with time. 2. According to Krichoff's law in thermal equilibrium absorptivity is equal to ........ 3....

**Heat Transfer**

Define Thermal diffusivity law?

**Heat Transfer**

Explain thermal conductivity & give its variation in case of solid, liquids and gases?

**Heat Transfer**

A metal storage tank of external area 0.5 m^2 contains water at 65 degree C. & is located inside a large enclosure with wall at 10 deg.C. the tank is painted black on the outside & its emissivity is approx. to 0.95. How much reduction in heat loss would occur if the outside ...

**Dynamics**

The power developed by a man in riding up a 6 percent grade at a constant speed is 200 w. The man and his bicycle have a combined mass of 80 kg. Determine the speed of riding

**Dynamics**

A pelton wheel attains its operating speed of 800 rev/min within 2s after it is turn on. Determine the constant angular accelerations of pelton wheel. also find the total number of revolutions the wheel makes before it attains operating speed

**Dynamics**

A ball is thrown vertically upward with a velocities of 18 m/s. Two seconds later another ball is thrown upwards with a velocity of 13.5 m/s. at what position above the ground will they meet?

**Dynamics**

a 1500 kg automobile is traveling up to 20 degree incline at a speed of 6 m/s. if the driver wishes to stop his car in a distance of 5m, determine the frictional force at pavement which must be supplied by rear wheels