Which of the following statements are correct for turbo-prop powered aircrafts?
1. The propulsion efficiency of turboprop is higher than that of turbo-jet and rockets for low speeds up to about 800 km/hr.
2. For the same thrust the turbine in the turbo-prop aircraft is smaller than in the turbo-jet aircraft
3. For the turbo-prop the flight velocity cannot exceed the jet velocity.
(A) 1, 2 and 3 (B) 1 and 2 only
(C) 2 and 3 only (D) 1 and 3 only