Aircraft Performance Questions and Answers – Cruise Method 1 – 1

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This set of Aircraft Performance Multiple Choice Questions & Answers (MCQs) focuses on “Cruise Method 1 – 1”.

1. In cruise method 1 the air pressure is decreased whereas the aircraft weight is increased.
a) True
b) False

Explanation: In cruise method 1 the air pressure is decreased as well as the aircraft weight is decreased. In cruise method 1 the W/p ratio is maintained constant and also L/D ratio is also kept constant.

2. What is the condition of cruise method 1?
a) Air pressure is increased
b) Aircraft weight is increased
c) W/D ratio is kept constant
d) L/D ratio is varying

Explanation: In cruise method 1 the air pressure is decreased as well as the aircraft weight is decreased. In cruise method 1 the W/p ratio is maintained constant and also L/D ratio is also kept constant.

3. Cruise climb technique is involved in ___________
a) cruise method 1
b) cruise method 2
c) cruise method 3
d) cruise method 4

Explanation: Cruise climb technique is involved in cruise method 1. In cruise method 1 the air pressure is decreased as well as the aircraft weight is decreased. In cruise method 1 the W/p ratio is maintained constant and also L/D ratio is also kept constant.

4. Which of the following is incorrect statement regarding cruise method 1?
a) W/D ratio is kept constant
b) L/D ratio is varying
c) Air pressure is decreased
d) Aircraft weight is decreased

Explanation: In cruise method 1 the air pressure is decreased as well as the aircraft weight is decreased. In cruise method 1 the W/p ratio is maintained constant and also L/D ratio is also kept constant.

5. What is Brequet Range expression?
a) R1 = $$\frac{D}{C}\frac{L}{V}$$ ln ω
b) R1 = $$\frac{1}{C} \left[\frac{2W}{\rho S}\right]^{\frac{1}{2}} \frac{C_L^{\frac{1}{2}}}{C_D}$$ ln ω
c) R1 = $$\frac{1}{V} \left[\frac{2W}{\rho S}\right]^{\frac{1}{2}} \frac{C_L^{\frac{1}{2}}}{C_D}$$ ln ω
d) R1 = $$\frac{V}{C}\frac{L}{D}$$ ln ω

Explanation: Brequet Range expression is given by R1 = $$\frac{V}{C}\frac{L}{D}$$ ln ω where V is true airspeed, C is specific fuel consumption, L is lift, D is drag, and ω is fuel ratio. This Brequet Range expression comes in the cruise method 1.

6. Brequet Range expression value is maximum at __________
a) 1.316 Vmd
b) 1.216 Vmd
c) 1.3 Vmd
d) 1.2 Vmd

Explanation: Brequet Range expression is given by R1 = $$\frac{V}{C}\frac{L}{D}$$ ln ω where V is true airspeed, C is specific fuel consumption, L is lift, D is drag, and ω is fuel ratio. This Brequet Range expression comes in the cruise method 1. Brequet Range expression value is maximum at 1.316 Vmd.

7. What is range factor in cruise method 1?
a) $$\left[\frac{V_{mdi}}{C} E_{max}\right]$$
b) $$\left[\frac{V_{max}}{C} E_{max}\right]$$
c) $$\Big\{\frac{2u^3}{u^4+1}\Big\}$$
d) $$\Big\{\frac{2u^4}{u^4+1}\Big\}$$

Explanation: Range factor in cruise method 1 is given by $$\left[\frac{V_{mdi}}{C} E_{max}\right]$$. The range equation in cruise method 1 is given by R1 = $$\left[\frac{V_{mdi}}{C} E_{max}\right]\Big\{\frac{2u^3}{u^4+1}\Big\}$$ ln ω where V is true airspeed, C is specific fuel consumption, L is lift, D is drag, Emax is endurance and ω is fuel ratio.

8. Which of the following does range factor consists?
a) Air density
b) Cruise weight
c) Temperature
d) Cruise weight and air density

Explanation: Range factor consists of cruise weight and air density. Range factor in cruise method 1 is given by $$\left[\frac{V_{mdi}}{C} E_{max}\right]$$. The range equation in cruise method 1 is given by R1=$$\left[\frac{V_{mdi}}{C} E_{max}\right]\Big\{\frac{2u^3}{u^4+1}\Big\}$$ ln ω where V is true airspeed, C is specific fuel consumption, L is lift, D is drag, Emax is endurance, u is relative airspeed and ω is fuel ratio.