1 through 25 please 1. When the logic of a relay control panel needs to be chang
ID: 3763728 • Letter: 1
Question
1 through 25 please
1. When the logic of a relay control panel needs to be changed, it usually involves _____.
a. a software update
b. installing higher-voltage relays
c. wiring changes
d. adding transistor drivers
2. NC or NO are the state of relay contacts when _____.
a. the coil is energized
b. the coil is unenergized
c. the contacts are in an AC circuit
d. the contacts are in a DC circuit
3. The Allen-Bradley Discrete Input address of a proximity switch connected to Module 3, Terminal 4 is _____.
a. O: 3 / 4
b. I: 2 / 4
c. I: 3 / 4
d. I2: 3 / 4
4. Software which converts graphical Ladder Logic to machine code is _____.
a. DOS
b. Compiler
c. Interpreter
d. Translator
5. Internal CPU logic circuits are isolated from the external input circuits by ____.
a. a Faraday cage
b. a guard ring
c. an optoisolator
d. a fiberglass enclosure
6. Scan associated with PLC is _____.
a. the CPU repeatedly reading inputs, solving the logic, setting outputs
b. the programmer reading over the ladder diagram to find errors
c. downloading a program from a PC scanner
d. single-stepping from rung to rung.
7. The most common programming language for PLC’s is _____.
a. Statement lists
b. Sequential Function Chart
c. Ladder Logic
d. BASIC
8. In Ladder Logic, a horizontal group of instruction symbols to control an output is called a _____.
a. subroutine
b. function group
c. rail
d. rung
9. Contacts in series are equivalent of logic _____, and contacts in parallel are equivalent of logic _____,
a. NAND … NOR
b. AND … OR
c. OR … AND
d. XOR … NOT
10. If input I:1/0 is a NO pushbutton (PB), and input I:1/1 is a NC limit switch (LS), which combination of inputs will cause the output to be energized on this rung? I:1/1 I:1/0 |--] / [-----------] [-----------------------------( )--|
a. PB not pressed, LS not pushed
b. PB not pressed, LS pushed
c. PB pressed, LS not pushed
d. PB pressed, LS pushed
11. If a timer’s Time Base is 0.01 sec in SLC500 PLC, and the Preset value is 3000, the timer’s delay time is _____.
a. 3.01 seconds
b. 30.00 seconds
c. 300.0 seconds
d. 3000 seconds
12. Which statement is not true for an inductive proximity sensor?
a. It requires a metallic target.
b. It must contact the target.
c. It emits a magnetic field.
d. It may be current-sourcing or current-sinking.
13. A count-up Counter (CTU) increments the Accumulator _____.
a. on False-to-True transitions of the enabling rung condition
b. on True-to-False transitions of the enabling rung condition
c. on each scan while the enabling rung condition is True
d. while the Accumulator value is less than the Preset value
14. A CTD counter with Accumulator value = 5 is enabled 8 times. The Accumulator value is now _____.
a. 13
b. 8
c. 0
d. -3
15. Arduino Uno has _____ bit controller.
a. 10
b. 9
c. 8
d 12
16. In BCD code, each decimal digit is represented by _____ binary bits.
a. 3
b. 4
c. 8
d. 10
17. A statement in program contains X = (int) 42.3. What will be value of variable X after execution?
a. X will be 42.3
b. X will be 0.3
c. X will be 42
d statement has syntax error
18. Consider the looping statement int i; for( i = 0; i < 10; i = i * 2) { ….; } Assuming the body of the loop does not break the loop or change i, how many times would the body of the loop be executed?
a. 0
b. 3
c. 7
d. 10
e.
19. Consider a loop section of program x = 0; while(x <= 10) { x++; } What will be final value in variable x?
a. x = 10
b. x = 11;
c. x = 9
d. x = 0
20. Following conditional statement becomes FALSE when if ((x<5) || (y >11 ))
a. x = 3 and y = 10
b. x = 5 and y = 11
c. x = 6 and y = 12
d. x = 3 and y= 12
21. To generate PWM waveform analogWrite() function can take maximum _______ number as an argument.
a. 1023
b. 256
c. 1024
d. 255
22. In order to activate internal pull-up resistor one can use following argument in association with
a. OUTPUT
b. INPUT
c. HIGH IMPEDENCE
d. pinMode(pin, HIGH); digitalWrite(pin, HIGH);
23. To read serial output on PC screen, one can use following add-on component with respect to Arduino IDE
a. Archive sketch
b. Serial Monitor
c. Board Manager
d. Hyper terminal
24. Arduino LCD functions can be utilize by importing__________ header file.
a. LCD.h
b. LiquidCrystalDisplay.h
c. LiquidCrystal.h
d. lcdDisplay.h
25. Arduino’s ADC has ________ dB SQNR
a. 60.2 dB
b. 54.18 dB
c. 100 dB
d. 30.1 dB
Explanation / Answer
1. a software update
2 b. the coil is unenergized
3 c. I: 3 / 4
4 d. Translator
5 c. an optoisolator
6 a. the CPU repeatedly reading inputs, solving the logic, setting outputs
7 c. Ladder Logic
8 d. rung
9 b. AND … OR
10 c. PB pressed, LS not pushed
11 a. 3.01 seconds
12 a. It requires a metallic target.
13 a. on False-to-True transitions of the enabling rung condition
14 d. -3
15 c. 8
16 b. 4
17 c. X will be 42
18 d. 10
19 a. x = 10
20 a. x = 3 and y = 10
21 d. 255
22 a. OUTPUT
23 b. Serial Monitor
24 a. LCD.h
25 a. 60.2 dB
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