Mechanical Engineering Interview Questions and Answers

156 :: How does hydraulic clutches work?

By using a non-compressible fluid, it acts like a solid push rod.

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157 :: Why is over-pressurizing an Air Conditioning system bad?

Overcharging a refrigeration or air conditioning system can result in an explosion. To avoid serious injury or death, never overcharge the system. Always use proper charging techniques. Limit charge amounts to those specified on the system equipment serial label or in the original equipment manufacturer's service information.

Overcharging the system immerses the compressor motor, piston, connecting rods, and cylinders in liquid refrigerant. This creates a hydraulic block preventing the compressor from starting. The hydraulic block is also known as locked rotor.

Continued supply of electricity to the system causes heat to build in the compressor. This heat will eventually vaporize the refrigerant and rapidly increase system pressure. If, for any reason, the thermal protector fails to open the electrical circuit, system pressure can raise to high enough levels to cause a compressor-housing explosion.

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158 :: What is the difference between blower and fan?

A fan can turn air, but a blower forces the air faster.

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159 :: What is the date of first Titan launch from Cape Canaveral?

The Titan I was launched from Launch Pad 15 on February 6 1959.

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160 :: What is knurling?

Knurling is a machining process normally carried our on a centre lathe. The act of Knurling creates a raised criss-cross pattern on a smooth round bar that could be used as a handle or something that requires extra grip.

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