P6,17 The goal of vertical cakeoff and landing (VFOL) aircraft is to achieve operation from relatively sunult airports and yet opernte as a nOrmal airomft in level flight [17]. An aircraft taking off in a form similar to a missile (on end) is inherently unstable (see Example 3.4 for a discussion of the inverted pendulum). A con- tro! systeni using adjustable jets can control the vehi- cle, as shown in Figute 16.17. (a) Determine the range of gain for wlhich the system is stable. (b) Determine the gain K tor which the system is marginally stable Bud the roots of the charucteristic equation for this value of K. FIGURE P6.17 Control of a jump jet aircraft. Controller Aircraft dynamics R(s) Y(sx) Desired K(s + 2) Actual vertical s+ 10 s(s – 1) vertical path path

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A shunt generator us connected to a load that draws 8.8 kW, Ra= 0.04 ohms and Rsh=. 48 ohms. If the power developed in the armature is 106.3% of the power delivered to the load, determine the terminal voltage of the generator.  A 15 kW, 230 V shunt generator was run light as a motor to determine its stray power losses at rated load . The applied voltage across the armature computed for test was 254 V and the armature current drawn is 2 A. The armature and shunt field resistances are 0.25 and 100. ohms, respectively. Calculate the generator efficiency at half load. Assume stray power losses to be constant.  A shunt generator supplies 100 A at 200 V. The armature and shunt resistances are 0.025 ohms and 100. ohms respectively. If the copper losses are equal to the iron losses at this load, find the brake horsepower of the engine driving the generator.

The flux density distribution in the airgap of a 60Hz,4-pole, salient pole machine is sinusoidal, having an amplitude of 0.8 T. Calculate the instantaneous and rms values of the voltage induced in 1150-turn, If the axial length of the armature and its inner diameter are both 100 mm.