1) Which of the following statements is true for a proportional valve?
a. spool of the proportional valve can travel maximum length
b. digital type of functioning is possible in proportional valve
c. proportional valve requires a separate flow control valve
d. all of the above
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Answer
Explanation
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ANSWER: spool of the proportional valve can travel maximum length
Explanation:
No explanation is available for this question!
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2) In mnemonics instructions, what does I in LDI indicate?
a. switch is normally open
b. switch is normally closed
c. it indicates operating of second switch
d. none of the above
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Answer
Explanation
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ANSWER: switch is normally closed
Explanation:
No explanation is available for this question!
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3) Write instructions for the NAND connections given below, which has A and B two switches connected in parallel
a. steps 0 1 2 components A B X instruction LDI ANI OUT
b. steps 0 1 2 components A B X instruction LD AND OUT
c. steps 0 1 2 components A B X instruction LD OR OUT
d. steps 0 1 2 components A B X instruction LDI ORI OUT
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Answer
Explanation
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ANSWER:
steps 0 1 2
components A B X
instruction LDI ORI OUT
Explanation:
No explanation is available for this question!
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4) The output device on a ladder diagram is represented by
a. square
b. circle
c. rectangle
d. semicircle
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Answer
Explanation
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ANSWER: circle
Explanation:
No explanation is available for this question!
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5) Which of the following is used an output device on a ladder diagram?
a. proximity sensor
b. detent switch
c. relay
d. all of the above
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Answer
Explanation
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ANSWER: relay
Explanation:
No explanation is available for this question!
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6) When PLC connections are used instead of electrical connections, the order of operations to be performed can be interchanged by
a. changing hardwired connections
b. changing sequence of program
c. both a. and b.
d. none of the above
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Answer
Explanation
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ANSWER: changing sequence of program
Explanation:
No explanation is available for this question!
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7) What causes burning of AC solenoid coil?
a. holding current
b. in rush current
c. current clamps
d. all of the above
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Answer
Explanation
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ANSWER: in rush current
Explanation:
No explanation is available for this question!
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8) What is PLC?
a. Process logic control
b. Programmable language converter
c. Programmable logic control
d. Programmable logic converter
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Answer
Explanation
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ANSWER: Programmable logic control
Explanation:
No explanation is available for this question!
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9) Which of the following is a characteristic of servo valve?
a. open loop system
b. closed loop system
c. less contamination
d. all of the above
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Answer
Explanation
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ANSWER: closed loop system
Explanation:
No explanation is available for this question!
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10) In which control valve energy consumption reduces as load decreases?
a. conventional direction control valve
b. proportional direction control valve
c. both a. and b.
d. none of the above
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Answer
Explanation
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ANSWER: proportional direction control valve
Explanation:
No explanation is available for this question!
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