Metro Exam questions with verified
answers graded A+
Absolute Block - correct answer ✔✔ A block strictly governed by Rail Control which no other
train is permitted to enter while it is occupied by another train.
Accidental Uncoupling - correct answer ✔✔ An unintentional mechanical or electrical
separation of two LRV couplers while a train is in motion.
Axle Counting System - correct answer ✔✔ A system used to show track occupancy or vacancy
by transmitting a pulse to detect passing wheels of a train.
Block - correct answer ✔✔ length of track having defined limits with its occupancy governed by
fixed signals or Raill Controller's orders.
Brakeman - correct answer ✔✔ The person designated to ride in a disabled LRV in order to
activate the , Emergency Mushroom , ' C car friction brake or brake pump to stop a disabled LRV.
Bumping Post - correct answer ✔✔ Device at the end of a track designed to prevent LRV ( s )
from leaving the track .
Catenary - correct answer ✔✔ system of overhead wires including contact wire , messenger
wire and hangers which supplies traction power to the LRV via the pantograph
Consist - correct answer ✔✔ The number and specific identity of LRV ( s ) that make up a train.
, Conflicting Movement - correct answer ✔✔ Routing of a train or equipment into the path of an
oncoming vehicle.
Contact Wire - correct answer ✔✔ The electrical conductor which provides the 750 Volts Direct
Current ( Vdc ) to the LRV through contact with the pantograph.
Crossover - correct answer ✔✔ Two connected track switches , which provide a route from one
track to another.
Dead - man Control - correct answer ✔✔ Dead - man Control - A device incorporated into the
LRV master controller and foot pedal that must be held in the operating position before train
movement can occur and if released will bring a moving LRV to a stop.
Flagger - correct answer ✔✔ A person assigned to protect workers and equipment on or near
the tracks and to ensure the safe passage of trains .
Frog - correct answer ✔✔ A track structure used at the intersection of two running rails to
provide support for wheels and passageways for flanges, thus permitting wheels on either rail to
cross the other.
Hanger - correct answer ✔✔ The vertical dropper wire spaced at regular intervals which
suspend the contact wire from the messenger wire.
Human Machine Interface ( HMI ) - correct answer ✔✔ A device that displays operational status
, fault monitoring and provides system control to the user.
Impedance Bond - correct answer ✔✔ An electrical device used to provide a path for t power
negative return and block AC signal circuit current.
answers graded A+
Absolute Block - correct answer ✔✔ A block strictly governed by Rail Control which no other
train is permitted to enter while it is occupied by another train.
Accidental Uncoupling - correct answer ✔✔ An unintentional mechanical or electrical
separation of two LRV couplers while a train is in motion.
Axle Counting System - correct answer ✔✔ A system used to show track occupancy or vacancy
by transmitting a pulse to detect passing wheels of a train.
Block - correct answer ✔✔ length of track having defined limits with its occupancy governed by
fixed signals or Raill Controller's orders.
Brakeman - correct answer ✔✔ The person designated to ride in a disabled LRV in order to
activate the , Emergency Mushroom , ' C car friction brake or brake pump to stop a disabled LRV.
Bumping Post - correct answer ✔✔ Device at the end of a track designed to prevent LRV ( s )
from leaving the track .
Catenary - correct answer ✔✔ system of overhead wires including contact wire , messenger
wire and hangers which supplies traction power to the LRV via the pantograph
Consist - correct answer ✔✔ The number and specific identity of LRV ( s ) that make up a train.
, Conflicting Movement - correct answer ✔✔ Routing of a train or equipment into the path of an
oncoming vehicle.
Contact Wire - correct answer ✔✔ The electrical conductor which provides the 750 Volts Direct
Current ( Vdc ) to the LRV through contact with the pantograph.
Crossover - correct answer ✔✔ Two connected track switches , which provide a route from one
track to another.
Dead - man Control - correct answer ✔✔ Dead - man Control - A device incorporated into the
LRV master controller and foot pedal that must be held in the operating position before train
movement can occur and if released will bring a moving LRV to a stop.
Flagger - correct answer ✔✔ A person assigned to protect workers and equipment on or near
the tracks and to ensure the safe passage of trains .
Frog - correct answer ✔✔ A track structure used at the intersection of two running rails to
provide support for wheels and passageways for flanges, thus permitting wheels on either rail to
cross the other.
Hanger - correct answer ✔✔ The vertical dropper wire spaced at regular intervals which
suspend the contact wire from the messenger wire.
Human Machine Interface ( HMI ) - correct answer ✔✔ A device that displays operational status
, fault monitoring and provides system control to the user.
Impedance Bond - correct answer ✔✔ An electrical device used to provide a path for t power
negative return and block AC signal circuit current.
