Solved Question Paper of Recruitment Test (Computer Based Recruitment Test) conducted by UPSC for the Post of Air Safety Officer in the Office of the Directorate General of Civil Aviation held on 11.08.2019.

71. A bipolar transistor has a common-emitter current gain of 125. If the transistor operates with a collector current of 50 mA, what is the value of base current?
(A) 400 Î¼A
(B) 40 Î¼A
(C) 4 Î¼A
(D) 0.4 Î¼A

72.

(A) 11.36 cm
(B) 1.136 cm
(C) 22.72 cm
(D) 2.272 cm

73. What is K value in (127.24)8 = (K)10?
(A) 87.1325
(B) 87.2135
(C) 87.3125
(D) 87.1125

74. Which one of the following systems is most suitable for short range navigation of airplanes?
(B) Instrument Landing System (ILS)
(C) VHF Omni-directional Range (VOR)
(D) Global Positioning System (GPS)

75. Which one of the following engine types is having Maximum flight Mach number as 0.5?
(A) Ramjet engine
(B) Turboprop engine
(C) Turbojet engine
(D) Piston engine with propeller

76. For a Fanno flow curve, in subsonic region friction causes
(A) irreversible deceleration of the flow with pressure rise
(B) irreversible deceleration of the flow with pressure drop
(C) irreversible acceleration of the flow with pressure drop
(D) irreversible acceleration of the flow with pressure rise

77. The thrust of rocket engines is
(A) directly proportional to flight speed
(B) directly proportional to square of flight speed
(C) inversely proportional to flight speed
(D) independent of flight speed

78. Engine Pressure Ratio (EPR) is defined as
(A) the ratio of the compressor inlet pressure to the ambient pressure
(B) the ratio of the turbine exit pressure to the ambient pressure
(C) the ratio of the turbine exit pressure to the compressor inlet pressure
(D) the ratio of the compressor inlet pressure to the turbine exit pressure