Trying to change trigger time for multiple task schedules

Below is the script am trying to use and i have also included the error am receiving.Someone please help me out.

Just to let you know , Below is how the tasknames look on which am trying to make change

TaskNames:-

1. test task
2. test task1
3. test task2

Script:-

$Tname=Get-ScheduledTask -TaskPath \ -TaskName "test task*" | Get-ScheduledTaskInfo | select taskName
$Time = New-ScheduledTaskTrigger -At 11pm -Weekly -WeeksInterval 4 -DaysOfWeek Wednesday
Set-ScheduledTask -TaskName $Tname -Trigger $Time

Error:-

 Set-ScheduledTask : Cannot process argument transformation on parameter 'TaskName'. Cannot convert value to type System.String.
At line:16 char:29
+ Set-ScheduledTask -TaskName $Tname -Trigger $Time
+                             ~~~~~~
    + CategoryInfo          : InvalidData: (:) [Set-ScheduledTask], ParameterBindingArgumentTransformationException
    + FullyQualifiedErrorId : ParameterArgumentTransformationError,Set-ScheduledTask