Q400 Systems Test Bank

56. Lifting the safety guard and rotating the selector knob to the open position allows the _____ to be fully open during emergency operations?

Forward saftey valve

67. Selecting the DUMP position on the pressurization system accomplishes what?

Fully opens the AFT outflow valve

125. In addition to a dual DC Generator failure, what is required for the EPCU to enter emergency mode?

INOP TRU and Airplane in Air

52. Manual mode is used on the pressurization system for what reason?

If Auto mode is INOP

117. A L TRU caution light will illuminate when what happens?

If the Respective TRU is offline or has failed.

114. Where are the Transformer Rectifier Units (TRUs) located?

In The nose

89. Which of the following statements regarding the avionics cooling system is most accurate?

It is completely automatic and uses three fans to cool the system..

116. During normal operation, which busses do the TRUs power?

L or R Secondary Bus

131. When the aircraft is powered by external DC power, which busses are powered?

L/R main feeder buses, Essential Buses, and feeder busses

122. If the Right Main Bus has a bus fault, which battery is disconnected from the system?

Main Batt

133. Which switch would pilots use to connect the main battery to the associated feeder bus?

Main Battery switch in the DC control Panel

127. When in emergency mode, which busses automatically disconnect from the batteries?

Main Bus

100. Which batteries are used for engine starting when ground power is not available?

Main/Aux

79. If bleed air from the engines is unavailable in flight, where does the air come from for cabin ventilation?

NACA Vent on Dorsal Fin

78. If the pack FCSOV malfunctions, it defaults to which of the following positions?

OPEN

136. At what point will electrical bus load shedding begin?

Once three dc sources fail

53. Holding the spring-loaded toggle switch to the DECR side accomplishes what?

Opens the Aft OutFlow Valve DECREASES cabin Pressure... Increases cabin Altitude..

60. If bleed air is unavailable in flight, the cabin and flight compartments can be ventilated with what?

Outside Ram Air

119. What does it mean when a plus sign (+) is displayed in front of a value on the MFD Electrical page?

Overload of power source

110. Where can the GPU be connected to the aircraft for DC power?

Plug on the left forward fuselage

129. Where are the AC generators mounted on the aircraft?

Propeller reduction gearbox

80. Where is the vent that allows ram air to enter the aircraft for the air conditioning system located?

Rear Dorsal Fin

68. When the pressurization mode switch is selected to the MAN position, which of the following is true?

Selecting Increase on the manual diff switch CLOSES the Aft outflow valve. Selecting Decrease on the manual diff switch OPENS the Aft outflow valve.

137. In emergency mode, the _____ are the main energy source for the airplane.

TRU Batteries

104. True or False: When the battery master is in the OFF position, all battery power is turned off no matter what position the other switches are in.

TRUE

123. True or False: If a Secondary bus fault occurs, the increased current will trip the circuit breaker for the respective TRU.

TRUE

126. True or False: In emergency mode, the batteries are the main source of power.

TRUE

140. True or False: The Pneumatics system provides air for airstair door seal pressurization?

TRUE

146. True or False: Bleed air is continuously supplied to the deicing system, regardless of flightdeck bleed switch positions.

TRUE

70. True or False: The air conditioning packs cool the hot bleed air prior to it entering the flight compartment and passenger cabin.

TRUE

72. True or False: Within the air cycle machine, there is a primary and a secondary heat exchanger.

TRUE

75. True or False: The ECU modulates the pack Flow Control and Shutoff Valve position based on Air Conditioning Control Panel selections.

TRUE

94. True or False: The electrical system comprises both a direct current (DC) system and an alternating current (AC) system.

TRUE

True or False: The aircraft's pressurization is provided by engine bleed air?

TRUE

76. True or False: If only one pack is operational, air flow will be reduced?

TRUE. Reduced to 70% of Selection

112. True or False: The EPCU protects the system from too high and too low DC power voltage form the external power source.

True

135. True or False: When a minus sign (-) is shown before a number on the MFD Electrical page, it means the battery is discharging.

True

96. True or False: Circuit breaker panels can be found in the left and right main landing gear wheel wells.

True

85. The Pack FCSOV will open when what happens?

When one pack switch is selected to Manual or Auto

107. When the battery temperature is within limits, what color does it display as on the MFD Electrical page?

White

139. Which of the following statements regarding the AC cross tie function is most accurate?

Works automatically to ensure both AC busses are Powered

109. If any battery temperature is 50 degrees C to 60 degrees C, what color does the battery temperature display as on the MFD Battery page?

Yellow

108. When the battery temperature exceeds normal limits, what colors would display on the MFD Electrical page?

Yellow or Red

Which valve is primarily manipulated to control the pressurization in the cabin of the aircraft?

Aft Out-Flow Valve

121. When does the EPCU send a signal to the generator to trip it offline during a Main DC bus fault?

After .5 seconds or more

124. In addition to an inoperative TRU, what is required for the EPCU to enter emergency mode?

Airplane in air — Both DC gens are not available

118. On the ground, what busses does the APU generator provide power for?

All six busses

101. How long will the batteries power the aircraft if normal electrical power fails?

At Least 60 minutes Some models do 45 minutes or 60 minutes

86. What valves are responsible for controlling the temperature of pack outlet air?

Bypass Valves

57. When the pressurization system is in AUTO and the FWD outflow valve is rotated to the open position, it causes the AFT outflow valve to _____.

Close

54. Holding the spring-loaded toggle switch on the pressurization panel to the INCR side accomplishes what?

Closes Aft Outflow valve which increases cabing pressure and decreases cabin altitude.

143. When BLEED 1 or BLEED 2 switches are selected OFF, what is the result in the associated bleed air system?

Closes the associated HPSOV (High Pressure Shut Off Valve) & the NSOV (Nacelle Shut Off Valve)

138. The AC generators connect to the system when the engines are started, Gen 1 and 2 switches are selected ON, and _____.

Condition levers are in the MIN to MAX range

88. When the packs are in the MAN position, what does the ECU do?

Controls temp based on duct supply instead of compartment temp..

111. When connected to external power on the ground, what is displayed on the MFD Electrical page?

DC EXT PWR ON (in green)

87. When the packs are in the AUTO mode, what does the ECU base temperature control upon?

Data from the temp sensors in the aircraft zones... Rotating target temp control selectors sets target temp for that specific zone..

61. The ram air vents used in flight when bleed air is not available are located on which part of the aircraft?

Dorsal Fin

58. Which pressurization mode would be used to depressurize the aircraft most rapidly?

Dump

73. The air conditioning system receives bleed air from what sources?

Either Engines OR APU But not at the same time..

145. After engine start, bleed air is primarily provided by what sources?

Engines

59. True or False: When the pressurization system is set to DUMP, the aircraft can still be pressurized?

FALSE

69. True or False: The MAN DIFF switch on the pressurization panel should be used in both auto and manual modes of pressurization.

FALSE

74. True or False: Bleed air can be used from the APU and engines at the same time.

FALSE

103. True or False: If the battery master is in the OFF position, the other batteries can still be used to power the aircraft.

FALSE. (Think MASTER)

141. True or False: The Pneumatics Electronic Control Unit (ECU) uses left and right digital channels for control with no associated backup channels.

FALSE. The Pneumatics Electronic Control Unit (ECU) also has L/R Analog Channels for redundancy..

147. True or False: If the DC starter/generator were to fail, the engines can still be started using APU bleed air.

False

95. True or False: DC power to the electrical system is supplied by two engine-driven DC generators only.

False. DC power is supplied by three NICAD Batteries, External power, 2 engine driven dc starter generators, 2 tru's and apu gen.

55. If the aft outflow valve becomes inoperative, pressurization can be controlled by what?

Forward Saftey Valve

77. How many different positions do the pack switches have?

3. OFF - MANUAL - AUTO

65. During automatic pre-pressurization, the cabin is pressurized how many feet below takeoff field elevation?

400

142. Prior to engine start, what source provides bleed air for the pneumatic system?

APU

120. The entire electrical system can still be powered when up to how many power sources have failed?

2

50. How many safety valves are there in addition to the Outflow Valve?

2

71. How many turbine shutoff valves are there on the Q400?

2

91. How many engine-driven DC starter-generators are there on the aircraft?

2

92. How many Transformer Rectifier Units (TRUs) are there on the aircraft?

2

84. How many fans must fail before a message illuminates on the ED?

2 fans

144. How many engine bleed ports are used to supply bleed air to the pneumatic system?

2 ports

106. How is negative discharge on a battery indicated on the MFD Battery page?

- minus sign (-)

130. How many external AC power ports are there on the aircraft?

1

93. How many APU generators are there on the aircraft?

1

105. If the battery is being charged at a 100% rate of charge, how will it be depicted on the MFD Battery page?

1.00

66. The cabin pressure controller is in the takeoff mode for no longer than how many minutes after takeoff?

10

128. What is the voltage output of the AC generators?

115 V

83. When the temperature control set to full cool, it targets what specific temperature?

15 c. 60 F

81. When both packs are operating, what is the distribution of the air for the flightdeck and passenger cabin?

25% Flight Compartment 75% Cabin

82. When the temperature control is set to full warm, it targets what specific temperature?

27 C. 80 F

113. After engine start, how many volts does the DC generator provide?

28 V DC Current

115. TRUs change 3-phase 115v AC to what?

28 v DC Output

134. How many batteries is the aircraft equipped with?

3

90. How many NiCad batteries are there on the aircraft?

3

99. The aircraft is equipped with which of the following batteries?

3 Batteries. (Main - STBY — AUX)

97. How many circuit breaker panels are there in the flight compartment?

4

102. How many battery switches are there?

4 Switches. - MASTER. MAIN. AUX. STBY

51. How many different modes are there on the pressurization system?

4. Auto - Manual - Emer - Dump

62. What is the maximum pressure differential pressure permitted by the cabin pressure controller?

5.46

63. At 25,000 feet, what cabin altitude gives you 5.46 PSI pressure differential?

8000

64. At what altitude does the cabin press warning light illuminate?

9800