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 μA
(B) 40 μA
(C) 4 μA
(D) 0.4 μA
(A) 400 μA
(B) 40 μA
(C) 4 μA
(D) 0.4 μA
Answer: (A)
72.
(A) 11.36 cm
(B) 1.136 cm
(C) 22.72 cm
(D) 2.272 cm
Answer: (A)
73. What is K value in (127.24)8 = (K)10?
(A) 87.1325
(B) 87.2135
(C) 87.3125
(D) 87.1125
(A) 87.1325
(B) 87.2135
(C) 87.3125
(D) 87.1125
Answer: (C)
74. Which one of the following systems is most suitable for short range navigation of airplanes?
(A) Long Range Radio Aid to Navigation (LORAN)
(B) Instrument Landing System (ILS)
(C) VHF Omni-directional Range (VOR)
(D) Global Positioning System (GPS)
(A) Long Range Radio Aid to Navigation (LORAN)
(B) Instrument Landing System (ILS)
(C) VHF Omni-directional Range (VOR)
(D) Global Positioning System (GPS)
Answer: (C)
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
(A) Ramjet engine
(B) Turboprop engine
(C) Turbojet engine
(D) Piston engine with propeller
Answer: (D)
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
(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
Answer: (C)
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
(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
Answer: (D)
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
(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
Answer: (C)
79. Across a strong normal shock, the ratio of density after the shock to that of before the shock attains a value of
Answer: (C)
80. In a ramjet engine, the inlet static pressure rise is achieved by
(A) venturimeter
(B) nozzle
(C) diffuser
(D) tail pipe
(A) venturimeter
(B) nozzle
(C) diffuser
(D) tail pipe
Answer: (C)
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