Thrust Weight Ratio MCQs : Here you will find MCQ Questions related to "Thrust Weight Ratio" in Aircraft Design. These Thrust Weight Ratio MCQ Questions Will help you to improve your Aircraft Design knowledge and will prepare you for various Examinations like Competitive Exams, Placements, Interviews and other Entrance Exmaniations
Thrust-to-weight ratio is a dimensionless ratio of thrust to weight of a?
B. jet engine
D. All of the above
Explanation: Thrust-to-weight ratio is a dimensionless ratio of thrust to weight of a rocket, jet engine, propeller engine, or a vehicle propelled by such an engine that is an indicator of the performance of the engine or vehicle.
SI units of thrust-to-weight ratio?
Explanation: The thrust-to-weight ratio can be calculated by dividing the thrust (in SI units – in newtons) by the weight (in newtons) of the engine or vehicle and is a dimensionless quantity.
In below Propeller-driven aircraft formula, hp is?
A. propulsive efficiency
B. true airspeed
C. shaft horsepower
Explanation: np is propulsive efficiency (typically 0.8), hp is the engine's shaft horsepower, and V is true airspeed in feet per second.
A plane can take off even if the thrust is less than its weight?
C. Can be yes or no
D. Can not say
Explanation: A plane can take off even if the thrust is less than its weight: if the lift to drag ratio is greater than 1, the thrust to weight ratio can be less than 1, i.e. less thrust is needed to lift the plane off the ground than the weight of the plane.
Higher value of thrust loading indicates ____
A. lowest maximum speed
B. lowest climb
C. lowest acceleration
D. higher maximum speed
Explanation: Thrust loading is nothing but a ratio. It is the ratio of aircraft thrust to the weight of the aircraft. Higher thrust loading means higher thrust for given weight. This will improve maximum speed of an aircraft.
The thrust can also be measured in ?
Explanation: The thrust can also be measured in pound-force (lbf) provided the weight is measured in pounds (lb)
Power loading of prop driven aircraft is ______
A. same as lift of propeller
B. greater or equal to one
C. always be zero
D. equal to drag always
Explanation: Power loading for propeller driven aircraft is an important parameter representing the relation between power and weight. Power loading will always be greater than one and in much idle case it will be one. It cannot be zero. Lift and drag are forces.
Thrust loading is defined as ____________
A. ratio of lift to thrust
B. ratio of drag to thrust
C. ratio of lift to weight
D. ratio of thrust produced by an engine to the weight of the aircraft
Explanation: Thrust loading is nothing but the thrust to weight ratio. It is defined as the ratio of thrust produced by the engine to the weight of the aircraft. Thrust loading will vary from aircraft to aircraft. It can be between 0.2-0.6 typically.
In cruising flight, the thrust-to-weight ratio of an aircraft is the inverse of the lift-to-drag ratio.
C. Can be true or false
D. Can not say
Explanation: In cruising flight, the thrust-to-weight ratio of an aircraft is the inverse of the lift-to-drag ratio because thrust is the opposite of drag, and weight is the opposite of lift.
What is thrust matching?
A. Comparison of the engine’s available thrust at cruise to the estimated weight of aircraft
B. Comparison of the engine’s available lift at cruise to the estimated drag of aircraft
C. Comparison of the engine’s available thrust at cruise to the estimated drag of aircraft
D. Comparison of the engine’s available power at cruise to the estimated drag of aircraft
Explanation: Thrust matching is nothing but the comparison of an engine’s available thrust at cruise to the estimated drag of aircraft. It is used for better initial estimation of the thrust to weight ratio.