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Browse complete papersThe dynamic viscosity of an oil used for lubrication between a shaft and sleeve is 4 poise.
The shaft diameter is 0.3m, and it rotates at 240 rpm.
Calculate the power lost in the bearing if the sleeve length is 120 mm and the thickness of the oil film is 1 mm.
643.4 watt
700 watt
543.4 watt
1000 watt
Correct answer
643.4 watt
Two soap bubbles of diameters 40 mm and 60 mm coalesce to form a single bubble.
Find the excess pressure inside the new bubble if the surface tension is 0.03 N/m.
0.67 \( N/m^{2} \)
1.67 \( N/m^{2} \)
4.67 \( N/m^{2} \)
3.67 \( N/m^{2} \)
Correct answer
0.67 \( N/m^{2} \)
What is the effect on the internal excess pressure if the diameter of a soap bubble is doubled?
Double
Become half
Become one-fourth
Remain unchanged
Correct answer
Double
If for a capillary tube the rise of water is 2 cm at \( \theta=30^\circ \), what will be the change in height if the contact angle changes to \( \theta=45^\circ \)? Assume other factors remain constant.
Height increases to about 2.41 cm
Height decreases to about 1.63 cm
Height decreases to about 1.414 cm
Height remains the same
Correct answer
Height increases to about 2.41 cm
Under which condition will the body float in a stable equilibrium position?
Let: G- Centre of gravity, M- Metacentric height, B- Center of buoyancy
G is above M
M is above G
B is above G
G, B and M coincide
Correct answer
G is above M
A body floating at the interface of two liquids will always have:
Equal volume in both liquids
Equal buoyant force from both liquids
Total buoyant force equal to weight
Higher density than both liquids
Correct answer
Equal volume in both liquids
Which of the following statements best explains why work developed per kg of air is higher in a gas turbine than in an I.C. engine?
Higher compression ratio in gas turbines
Higher mechanical efficiency of gas turbines
Use of excess air for combustion in gas turbines
Expansion of gases up to atmospheric pressure in gas turbines
Correct answer
Higher compression ratio in gas turbines
Who originally theorized the four-stroke cycle used in today's gasoline engines (Otto cycle)?
Rudolf Diesel
Bea de Rochas
Dugald Clerk
Nicolaus August Otto
Correct answer
Rudolf Diesel
Which component is found in both gasoline (petrol) and diesel engines among these options?
Carburettor
Spark plug
Injector
Crankshaft
Correct answer
Carburettor
In a four-stroke spark ignition engine, ignition of the fuel-air mixture occurs______.
during the suction stroke
at the beginning of compression stroke
during the exhaust stroke
near the end of the compression stroke
Correct answer
during the suction stroke