IR - Instrument Rating License Test for Helicopters IR (H) - Aircraft General Knowledge Instrumentation Practice Exam PDF License License IR (H) - Aircraft General Knowledge Instrumentation Practice Exam PDF Questions Available Here at: https://www.easy-quizzz.com/us/dmv-practice-test/ir-instrument-rating-license-test-for- helicopters/ir-h-aircraft-general-knowledge-instrumentation-practice-exam/quiz.html Enrolling now you will get access to 0 questions in a unique set of IR (H) - Aircraft General Knowledge Instrumentation Practice Exam Question 1 One of the most significant dangers related to the use of the on-board oxygen system is that... Options: A. the oxygen, in contact with oil or grease, causes a chemical reaction that can lead to spontaneous combustion B. at high altitude and low surrounding atmospheric pressure, the debit flow of the oxygen is insufficient for normal respiration C. after maintenance, there is always a remainder of lubricant (e.g. oil or grease) in the oxygen lines, producing toxic gases D. fungus can grow in the oxygen lines because of the high humidity of the on-board environment Answer: A Explanation: The oxygen, in contact with oil or grease, causes a chemical reaction that can lead to spontaneous combustion. Question 2 Consider the following situation, the rudder ratio limiter of an aircraft gets stuck in high-speed/high altitude License License IR (H) - Aircraft General Knowledge Instrumentation Practice Exam PDF https://www.easy-quizzz.com/us/ mode when decelerating for the approach. Which of the following statements is correct? Options: A. Increased maximum operating speed B. Reduced crosswind limitation C. A greater flap setting will be required D. Greater rudder authority during approach Answer: B Explanation: The rudder ratio limiter getting stuck in high-speed/high altitude mode when decelerating for the approach will result in a reduced crosswind limitation. This is because a stuck rudder ratio limiter can affect the aircraft's control effectiveness, especially during crosswind conditions. Question 3 Consider a jet engine whose control is based on the Engine Pressure Ratio (EPR): with a constant EPR, the thrust decreases when the altitude increaseswith a constant EPR, the thrust is independent of the Mach numberAt same environmental conditions, a given EPR setting maintains the thrust irrespective of engine wear due to ageing.the EPR is determined by the total pressure difference between the turbine outlet and the compressor inlet on take-off, in the event of icing not detected by the crew, the indicated EPR is lower than the real EPRThe combination that regroups all of the correct statements is: Options: A. 1, 5 B. 1, 3 C. 2, 3, 4 D. 3, 4, 5 Answer: B Explanation: The correct combination of statements is 1 and 3. With a constant EPR, the thrust decreases when the altitude increases and at the same environmental conditions, a given EPR setting maintains the thrust irrespective of engine wear due to aging. Question 4 If the two loops of an engine fire detection system detect a low resistance and a low capacity: Options: License License IR (H) - Aircraft General Knowledge Instrumentation Practice Exam PDF https://www.easy-quizzz.com/us/ A. the loops are faulty B. the engine is on fire C. everything is normal D. the system is under test Answer: A Explanation: If the two loops of an engine fire detection system detect a low resistance and a low capacity, it indicates that the loops are faulty. Question 5 An intercooler fitted between a supercharger and the inlet manifold will... Options: A. reduce the mass flow through the engine B. increase the combustion temperature C. reduce pre-ignition D. minimise the risk of detonation Answer: D Explanation: An intercooler fitted between a supercharger and the inlet manifold will help reduce the temperature of the compressed air before it enters the engine, which can minimize the risk of detonation. Question 6 A lithium-ion battery is most unsafe when the battery... Options: A. has an internal short circuit B. is charged rapidly C. has a very low charge D. is discharged quickly Answer: A Explanation: Lithium-ion batteries are most unsafe when they have an internal short circuit, as this can lead to thermal License License IR (H) - Aircraft General Knowledge Instrumentation Practice Exam PDF https://www.easy-quizzz.com/us/ runaway and potentially cause a fire or explosion. Question 7 A helicopter is equipped with a retractable undercarriage. What happens if the pilot selects UP with the landing gear lever when the helicopter is still on the ground? Options: A. The landing gear starts to retract even with the ground safety pin installed B. Only those wheels without a microswitch contact will retract C. If the ground safety pin has also been removed, the landing gear starts to retract D. As long as the helicopter remains on the ground the landing gear retraction process is inhibited Answer: D Explanation: The landing gear retraction process is inhibited as long as the helicopter remains on the ground. Question 8 Why is it important to remove hydraulic fluid that has spilled onto the aircraft as soon as possible? Options: A. To minimise environmental damage B. To prevent skin corrosion C. To reduce friction drag D. To protect against lightning strikes Answer: B Explanation: It is important to remove hydraulic fluid that has spilled onto the aircraft as soon as possible to prevent skin corrosion. Question 9 An abortive (hung) start is the term used to describe an attempt to start in which the engine: Options: A. lights up, but fails to accelerate sufficiently B. fails to light up License License IR (H) - Aircraft General Knowledge Instrumentation Practice Exam PDF https://www.easy-quizzz.com/us/ C. commences initial rotation, but fails to receive any fuel D. will not rotate Answer: A Explanation: An abortive (hung) start is when the engine lights up during start-up but fails to accelerate sufficiently. Question 10 Where installed, airborne fluid anti-icing systems are mainly used on.. Options: A. engine intakes B. engine pylons C. pitot probes D. wing leading edges Answer: D Explanation: Airborne fluid anti-icing systems are mainly used on wing leading edges to prevent ice formation. Would you like to see more? 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