Electricity Practice Quiz
5 lvl test
- 1.
The constand speed drive (CSD) that is used to drive a 60/80 Kilo Volts Amperes(kVA) generator has a revolutions per minutes (rpm) output of approximately?
- A.
4,000 rpm
- B.
6,000 rpm
- C.
8,000 rpm
- D.
10,000 rpm
Correct Answer
C. 8,000 rpm -
- 2.
The underspeed switch on the 60/80 kVA generator contstand speed drive actuates at?
- A.
325 Hz
- B.
345 Hz
- C.
365 Hz
- D.
395 Hz
Correct Answer
C. 365 Hz -
- 3.
In an alternating current power supply system, the component that controls load division during parallel generator operation is the?
- A.
Load controller
- B.
Underspeed switch
- C.
Constant speed drive
- D.
Generator control unit
Correct Answer
A. Load controller -
- 4.
What circuit in the generator control unit in an alternating current power supply system isolates shorted or open generator phase leads?
- A.
Reactive biasing
- B.
Voltage regulator
- C.
Neutral current-sensing
- D.
Unbalanced current-sensing
Correct Answer
C. Neutral current-sensing -
- 5.
At what alternating current voltage range does the generator control unit in an AC power supply system maintain generator output?
- A.
135(+ or - 3) VAC
- B.
125( + or -3) VAC
- C.
115(+ or -2) VAC
- D.
105(+ or -2) VAC
Correct Answer
C. 115(+ or -2) VAC -
- 6.
In an alternating current power supply system, what component connects the 115/200 alternating current voltage main generator output to the main power buses?
- A.
Bus tie lockout
- B.
Bus tie contactor
- C.
Generator control unit
- D.
Generator line contactor
Correct Answer
D. Generator line contactor -
- 7.
What could cause the GEN OUT light to stay on?
- A.
Bus tie switch
- B.
Bus tie contactor
- C.
Open GEN OUT light
- D.
Generator control switch
Correct Answer
D. Generator control switch -
- 8.
If the No. 1 generator will not come on-line and the voltmeter readings are 28 VDC at the generator control switch, 28 VDC at the input to the generator line contactor coil, and 28 VDC at the ground of the generator line contactor, the most likely cause is?
- A.
An open GLC coil
- B.
A shorted GLC coil
- C.
An open GLC ground
- D.
A shorted GLC ground
Correct Answer
C. An open GLC ground -
- 9.
Which emergency alternating current power system component prevents the emergency generator from dropping off-line when the aircraft lands?
- A.
Emergency power disconnect relay
- B.
Emergency power interlock relay
- C.
Emergency generator test switch
- D.
Power fail relay
Correct Answer
B. Emergency power interlock relay -
- 10.
What is the minimum alternating current voltage requirement to energize the Emergency Power Disconnect Relay?
- A.
90 VAC from A phase
- B.
90 VAC from C phase
- C.
93 VAC from A phase
- D.
93 VAC from C phase
Correct Answer
D. 93 VAC from C phase -
- 11.
The auxiliary source selected to power the tie bus in the auxiliary power unit is determined by the?
- A.
Lockout relay
- B.
Bus protection panel
- C.
APU/external power contactor
- D.
APU external power disconnect contactor
Correct Answer
C. APU/external power contactor -
- 12.
The output of the auxiliary power unit generator is maintained at a constant level?
- A.
By varying APU speed
- B.
By controlling the APU fuel-flow
- C.
With the main engine throttles
- D.
With the protection circuits in the generator control unit
Correct Answer
B. By controlling the APU fuel-flow -
- 13.
When troubleshooting a problem(ex. external power will not come on-line and the READY light is not on), the first thing you should do is?
- A.
Do an operational check to verify the problem
- B.
Check for continuity on the external power unit
- C.
Replace the external power unit
- D.
Take voltage readings
Correct Answer
A. Do an operational check to verify the problem -
- 14.
On the external power system, when the ohmeter shows an infinity reading on an external power receptacle, between the points where control voltage leaves the bus protection panel and returns,
- A.
The external power unit is operating properly
- B.
The external power unit is not operating at all
- C.
There is continuity in the loop
- D.
There is an open in the loop
Correct Answer
D. There is an open in the loop -
- 15.
In the direct current power supply, the delta-wound secondaries of the internal transformer in the transformer rectifier unit are used to provide a more stable?
- A.
Current input
- B.
Voltage input
- C.
Current output
- D.
Voltage output
Correct Answer
C. Current output -
- 16.
During normal operation, the reverse current relays, in a direct current power supply system, receive power from the?
- A.
Transformer rectifier units
- B.
Emergency DC bus
- C.
Battery bus
- D.
Battery
Correct Answer
A. Transformer rectifier units -
- 17.
What is the cause of a normal battery not charging, when the direct current power supply system is operating and the battery switch is in the NORMAL position?
- A.
No. 1 transformer rectifier unit inoperable
- B.
No. 2 TR unit inoperable
- C.
Open standby battery relay
- D.
Open normal battery relay
Correct Answer
D. Open normal battery relay -
- 18.
Which stabilizer trim system switch can be used to shut off the stabilizer trim system?
- A.
Stabilizer trim control relay
- B.
Stabilizer trim cutout switch
- C.
Stabilizer trim nose down-limit switch
- D.
Pilots or co-pilots trim control switch
Correct Answer
B. Stabilizer trim cutout switch -
- 19.
Excessive wear of the ball detent clutch in the stabilizer trim actuator assembly most likely occurs when?
- A.
There is not enough lubrication
- B.
There is no observer in the tail compartment
- C.
The pilot and copilot trim switches are actuated in opposite direction
- D.
The jackscrew is allowed to extend to the maximum travel while the aircraft is on the ground
Correct Answer
C. The pilot and copilot trim switches are actuated in opposite direction -
- 20.
The aircraft write-up states that there is no trim action from either the pilots or co-pilots stabilizer trim control switch. You troubleshoot the problem and find voltage and ground at the stabilizer trim actuator. The most probable cause of this problem is the stabilizer trim
- A.
Actuator
- B.
Safety relay
- C.
Cutout switch
- D.
Control switch
Correct Answer
A. Actuator -
- 21.
What component is used as an emergency means of controlling the aileron trim control?
- A.
Control stick grip trim switch
- B.
Aileron trim control switch
- C.
Trim selector switch
- D.
Auxiliary trim switch
Correct Answer
D. Auxiliary trim switch -
- 22.
Takeoff trim indicator lights are used to?
- A.
Indicate that the ailerons must be trimmed
- B.
Indicate when the ailerons are in the takeoff position
- C.
Warn the pilot when the aircraft is out of flight formation
- D.
Prevent feedback current from passing to the deenergized side of the circuit
Correct Answer
B. Indicate when the ailerons are in the takeoff position -
- 23.
When the stick grip trim selector switch is moved to the left, the position of the aircraft left aileron is?
- A.
Up (left wing up)
- B.
Up (left wing down)
- C.
Down (right wing up)
- D.
Down (right wing down)
Correct Answer
B. Up (left wing down) -
- 24.
After the stick grip trim selector switch is released, the trim indicator light?
- A.
Extinguishes
- B.
Remains illuminated
- C.
Flashes on and off briefly
- D.
Remains on throughout the full cycle of the ailerons
Correct Answer
A. Extinguishes -
- 25.
The two types of wing flaps used on heavy aircraft are?
- A.
Solid and Fowler
- B.
Slotted and Fowler
- C.
Solid and retractable
- D.
Slotted and retractable
Correct Answer
B. Slotted and Fowler -
- 26.
After flap actuator jackscrews have reached the fully retracted position, what stops the rotation of the flap lock motor?
- A.
Drive shafts
- B.
Flap lock screws
- C.
Flap power down relay
- D.
Motor retract limit switch
Correct Answer
D. Motor retract limit switch -
- 27.
If the speedbrakes are fully open and the landing gear is down and locked while the aircraft is in flight, the speedbrakes will be?
- A.
Fully extended
- B.
Fully retracted
- C.
Limited to 43 degrees
- D.
Limited to 60 degrees
Correct Answer
C. Limited to 43 degrees -
- 28.
What is used to minimize the initial torque shock to the drive coupling at the beginning of fuel-air operation?
- A.
Slip-type clutch
- B.
Hydraulic clutch
- C.
Pneumatic shock
- D.
Sprag-type clutch
Correct Answer
A. Slip-type clutch -
- 29.
When a pneumatic starter reaches maximum speed, the ground circuit to the starter relay is opened by?
- A.
The pilot valve
- B.
A pressure switch
- C.
Centrifugal switch
- D.
The ON-OFF switch in the cockpit
Correct Answer
C. Centrifugal switch -
- 30.
What happens to the air in a pneumatic started system when the regulating-and-shutoff valve closes?
- A.
Vented overboard
- B.
Channeled into the starter
- C.
Exhausted by the valve actuator
- D.
Routed through the valve-regulator
Correct Answer
A. Vented overboard -
- 31.
The alternating current voltage power requirement for operation of an AC ignition system is?
- A.
115 VAC, 60 Hz
- B.
208 VAC, 60 Hz
- C.
115 VAC, 400 Hz
- D.
208 VAC, 400 Hz
Correct Answer
C. 115 VAC, 400 Hz -
- 32.
In a direct current ignition system, what component changes the direct current into a pulsating current?
- A.
Magnet
- B.
Vibrating unit
- C.
Small generator
- D.
Step-up transformer
Correct Answer
B. Vibrating unit -
- 33.
If the engine starter system is operating properly but the aircraft engine will not start, what components are working properly?
- A.
Centrifugal switches
- B.
Step-up transformers
- C.
Aircraft wiring
- D.
Igniter plugs
Correct Answer
A. Centrifugal switches -
- 34.
If the gas turbine compressor does not start, but the start light comes on and stays on when the control switch is placed to the START and RUN positions, what do you check first?
- A.
Starter fuse
- B.
Starter relay
- C.
Control switch
- D.
Ignition hold relay
Correct Answer
A. Starter fuse -
- 35.
What type of fuel system valves link the left wing and aft body tanks to the right wing, mid body, and forward body tranks?
- A.
Crossfeed
- B.
Fire shutoff
- C.
Interconnect
- D.
Fuel-level control
Correct Answer
C. Interconnect -
- 36.
How does the auxiliary fuel tank indicating system give a no-flow indication?
- A.
Steady red light
- B.
Flashing red light
- C.
Steady amber light
- D.
Flashing amber light
Correct Answer
D. Flashing amber light -
- 37.
You can check the fuel boost pumps in the fuel control system by?
- A.
Pulling and resetting the pump circuit breaker
- B.
Depressing a pressure switch
- C.
Measuring fuel-flow
- D.
Using a multimeter
Correct Answer
A. Pulling and resetting the pump circuit breaker -
- 38.
The green band on the main fuel tank fuel-quantity indicator
- A.
Calibrates the main tank fuel-indicator
- B.
Gives an indication of boost pump pressure
- C.
Indicates when the gauge needs to be replaced
- D.
Indicates where the safe-level switfhes open the electrical circuit
Correct Answer
D. Indicates where the safe-level switfhes open the electrical circuit -
- 39.
How many boost pumps are there in main fuel tank No. 1?
- A.
Two
- B.
Three
- C.
Four
- D.
Five
Correct Answer
C. Four -
- 40.
When the aft body fuel tank is supplying fuel to the aircraft engines and the fuel level becomes too low, what signal is given to warn the crew?
- A.
A warning horn sounds
- B.
The dome lights come on bright
- C.
An audible fuel-low warning sounds
- D.
The amber light next to the fuel-quantity indicator flashes
Correct Answer
D. The amber light next to the fuel-quantity indicator flashes -
- 41.
The output in gallons per minute of the scavenge pumps is approximately?
- A.
1/2 gpm
- B.
1 gpm
- C.
2 gpm
- D.
3 gpm
Correct Answer
C. 2 gpm -
- 42.
If an ohmeter reading from case ground to one phase of the fuel boost pump indicates infinity. this indicates?
- A.
Two phases shorted together
- B.
A dead short in the circuit
- C.
An open in the circuit
- D.
A normal reading
Correct Answer
D. A normal reading -
- 43.
Frequently used in fire warning systems, the fire detector that has a high-nickel steel rod located along the centerline of a stainless steel tube assembly is called?
- A.
A photocunductive cell
- B.
An iron fireman switch
- C.
A FENWAL switch
- D.
A continuous switch
Correct Answer
B. An iron fireman switch -
- 44.
The maximum circuit resistance within a thermocouple circuit is?
- A.
5 ohms
- B.
50 ohms
- C.
500 ohms
- D.
Infinity
Correct Answer
A. 5 ohms -
- 45.
Amplifiers used in the photoelectric fire detector system are sensitive only?
- A.
Sunlight
- B.
Light emitted from flashlights
- C.
Signals with a frequency between 7 to 60 Hz
- D.
Signals with a frequency between 60 to 160 Hz
Correct Answer
C. Signals with a frequency between 7 to 60 Hz -
- 46.
The direct current voltage that is supplied to the lights in a photoelectric circuit is pulsed at a rate of?
- A.
10 Hz
- B.
100 Hz
- C.
200 Hz
- D.
400 Hz
Correct Answer
A. 10 Hz -
- 47.
In a continuous loop fire detection system, the shield of the continuous loop is constructed of?
- A.
Soft iron
- B.
Aluminum
- C.
Malleable tin
- D.
INCONEL
Correct Answer
D. INCONEL -
- 48.
The first step you take when troubleshooting the master caution system is to?
- A.
Analyze the problem
- B.
Start voltage checks
- C.
Start continuity checks
- D.
Perform an operational check
Correct Answer
A. Analyze the problem -
- 49.
When the cargo and personnel doors close and lock, the door-
- A.
Open relay will energize
- B.
Open relay will deenergize
- C.
Position relay will energize
- D.
Position relay will deenergize
Correct Answer
B. Open relay will deenergize -
- 50.
When all systems are configured for flight, the pilot or copilot must press the?
- A.
Aileron roll trim lever
- B.
Autopilot engage lever
- C.
Hydraulic pitch trim levers
- D.
Thrust reverser locked lever
Correct Answer
C. Hydraulic pitch trim levers -
Quiz Review Timeline +
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Current Version
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Mar 22, 2016Quiz Edited by
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Mar 29, 2011Quiz Created by
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