740 Variable voltage selective-collective control systems :Detailed Answers rated
100%
(refer to NEIEP simplex or duplex selective-collective wiring diagrams)
Duplex operation allows the "home car" to respond to a hall call after a 40 second delay with the dropping of
which relay/s? - ansTT & TTX relays
If there is a short in the hall or car button circuits, which fuse/s should open? - ansFuse 5 or 10
In the duplex system, when one car is traveling down to the lobby and the second car is parked at the lobby
with the generator shit down, which car would answer a 5th floor up hall call? - ansHome car
On duplex operation, what relay drops out on a power failure and ties the hall button circuit to the power
supply of the other car? - ansRV
On duplex operation, what relay is always energized during normal operation and drops out when the car stop
switch is opened? - ansTG
Slow speed relays 1E, 2E, and 3E pull in at the same time, shunting the GF1, GF2, and GF3 resistors. What
prevents the car from feeling bumps? - ansThe self excited shunt field
The brake coil is energized by the U 3-4 or D 3-4 contacts on the HL1 side of the line and by what contact on the
MF side of the line? - ansH 1-2
The DF relay [13] will not pick in either direction. Which of the following is probably open? - ansH 1-2
The motor generators drive motor (DV) will run on delta through what contacts? - ansKR 1-2, KR 3-4, and KR 5-
6
To close the doors when I'm attendant control , what buttons must be pressed? - ansThe U or D button
100%
(refer to NEIEP simplex or duplex selective-collective wiring diagrams)
Duplex operation allows the "home car" to respond to a hall call after a 40 second delay with the dropping of
which relay/s? - ansTT & TTX relays
If there is a short in the hall or car button circuits, which fuse/s should open? - ansFuse 5 or 10
In the duplex system, when one car is traveling down to the lobby and the second car is parked at the lobby
with the generator shit down, which car would answer a 5th floor up hall call? - ansHome car
On duplex operation, what relay drops out on a power failure and ties the hall button circuit to the power
supply of the other car? - ansRV
On duplex operation, what relay is always energized during normal operation and drops out when the car stop
switch is opened? - ansTG
Slow speed relays 1E, 2E, and 3E pull in at the same time, shunting the GF1, GF2, and GF3 resistors. What
prevents the car from feeling bumps? - ansThe self excited shunt field
The brake coil is energized by the U 3-4 or D 3-4 contacts on the HL1 side of the line and by what contact on the
MF side of the line? - ansH 1-2
The DF relay [13] will not pick in either direction. Which of the following is probably open? - ansH 1-2
The motor generators drive motor (DV) will run on delta through what contacts? - ansKR 1-2, KR 3-4, and KR 5-
6
To close the doors when I'm attendant control , what buttons must be pressed? - ansThe U or D button
