Test: Pressure & Its Measurements, Reciprocating Pumps, Flow Around Submerged Bodies - Drag & Lift - 1 - Mechanical Engineering MCQ

An inverted U-tube manometer is used to measure the pressure difference between two pipes A and B, as shown in the figure. Pipe A is carrying oil(specific gravity=0.8) and pipe B is carrying water. The densities of air and water are 1.16 kg/m3 and 1000 kg/m3, respectively. The pressure difference between pipes A and B is _____kPa.
Acceleration due to gravity:g = 10 m/s2 

What will be the discharge of a single-acting pump if it has one cylinder of area 0.5 m² and stroke of length 20 cm and if the pump has 180 rpm of speed?

A single-acting reciprocating pump has a 15 cm piston with a crank radius of 15cm. The delivery pipe is 10 cm in diameter. At a speed of 60 rpm, 310 litres/minute of water is lifted to a height of 15 cm. Find the coefficient of discharge.

Consider the following coefficients: (R_e = Reynolds number)
1. 1.328 R_{e_ (0.5)} for laminar flow
2. 2.072 R_{e_ (0.2)} for turbulent flow
3. 0.072 R_{e _ (0.2)} for turbulent flow
4. 1.028 R_{e _ (0.5)} for laminar flow
The coefficient of drag for a flat would include

An automobile moving at a velocity of 40 km/hr is experiencing a wind resistance of 2 kN. If the automobile is moving at a velocity of 50 km/hr,the power required to overcome the wind resistance is:  

Improved streaming produces 25% reduction in the drag coefficient of a torpedo. When it is travelling fully submerged and assuming the driving power to remain the same, the crease in speed will be:

A parachutist has a mass of 90 kg and a projected frontal area of 0.30m² in free fall. The drag coefficient based on frontal area is found to be 0.75. If the air density is 1.28 kg/m³, the terminal velocity of the parachutist will be: