The trigger time for an SCR with a capacitor at its gate ranges from a) 0 deg to
ID: 2268476 • Letter: T
Question
The trigger time for an SCR with a capacitor at its gate ranges from a) 0 deg to 45 deg b) 0 deg to 90 deg c) 0 deg to 180 deg d) 180 deg to 360 deg 2. The major disadvantage of using a photoelectric sensor using the opposed sensing method is a) Cannot detect transparent objects b) Not good for small object detection c) Short sensing distance d) All of the above 3. For measuring level from 0 to 4 meters in a tank, it is installed some ultrasound device consisting of a transmitter and a receiver, and installed at the 4 m level. It was send a testing signal, received 20 msec latter. Take the sound speed in the air as 340 m/sec. The water level in the tank is: a) 0.6 m b) 3.4 m c) 2.3 m d) 1.7 mo 4. Assuming the values of all resistors connected to a difference op-amp are the same, what is the output voltage when +3 V is applied to the inverting input and +1 V is applied to the noninverting input a) +1V b) +2 V c) +4 V d) -2VExplanation / Answer
1 answer:- the triggering time for SCR with a capacitor as a gate ranges from 180 degrees to 360 degrees.
2 answer:- the major disadvantage of using the photoelectric sensor in opposed sensing method is it cannot detect the transparent objects.
3 answer:- sound speed is 340 m/ sec. so for 1second, it travels 340m. so 20msec, it travels 6.8m. so the depth of water level is 3.4m.
4 answer:- -2volts.
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