Please answer all questions 1.If measurement value differ in correct location by
ID: 3769375 • Letter: P
Question
Please answer all questions
1.If measurement value differ in correct location by always fixed amount of value then one can say it is
a.lack of precision
b.biased
c.lower in resolution
d.an error
2.Sensor data measurement can be made less sensitive to variation by
a.time averaging
b.accumulating
c.differentiating
d.reducing sampling rate
3.Which of the following is open loop control system?
a.PWM controlled DC motor
b.ballcock in toilet
c.Home temperature controller
d.switch controlled bulb
4.Which control system has tendency to possess oscillatory behavior?
a.Open loop control
b.close loop control
c.both (a) and (b)
d.none of the above
5.Which of the following example is Sequential control process?
a.daylight sensor based parking light
b.amplifier
c.chemical process
d.Room temperature control system
6.Which device is similar to RTD but impose negative temperature coefficient?
a.strain gauge
b.thermistor
c.optocoupler
d.transformer
7.A TRIAC can trigger on
a.0 to 45 degree of sinusoidal cycle
b.0 to 90 degree of sinusoidal cycle
c.0 to 180 degree of sinusoidal cycle
d.0 to 360 degree of sinusoidal cycle
8.The only way to turn OFF SCR is
a.applying trigger input to the gate
b.forward breakdown voltage
c.low current in forward direction
d.low voltage
9.Photovoltaic cell is used to
a.amplify sound signal
b.sense light intensity
c.produce electric power
d.display alphanumeric character
10.An important job of sensor interfacing circuit is
a.to connect sensor to power supply
b.to convert output into voltage
c.to convert output into current
d.to match input range of controller to output of sensor
11.An ADC is used to convert rpm measured by tachometer sensor into digital value. This tachometer can measure maximally 1999 rpm. What should be sampling frequency of ADC in this case
a.1999 HZ
b.3998 HZ
c.2000 Hz
d.999 Hz
12.Job of quantizer in ADC is
a.to discretize analog input in time domain
b.to discretize analog input in frequency domain
c.to discretize analog input in amplitude domain
d.to provide equivalent digital binary output
13.Minimum sampling rate for R/2R DAC is
a.two times maximum frequency content of analog input
b.same as maximum frequency content of analog input
c.half of maximum frequency content of analog input
d.none of the above
14.MOSFET gate current is equivalent to
a.base current of transistor
b.reverse current of Zener diode
c.zero
d.holding current of SCR
15.Which of the motors cannot be operated without load?
a.stepper motor
b.shunt motor
c.series motor
d.synchronous motor
16.Discrete I/O module of PLC can only allow to connect
a.binary devices (ON/OFF)
b.analog devices
c.communication devices
d.programming host
17.In this ladder logic example, output is energized by following boolean function.
a.A.B+D+C
b.A.B+D.C
c.(A.B+D)+C
d.(A.B+D).C
18.Arduino Uno accepts most commands as
a.C language
b.C# language
c.Java language
d.assembly language
19.Static variable has a scope limited to
a.program file only
b.main function only
c.external function only
d.external file only
20.What is the maximum value you can store in signed integer variable in Arduino programs?
a.32768
b.32767
c.65535
d.65536
21.Which of the following represent comments in C
a.*/…….*/
b./
c./*………
d./*……*/
22.What will be value in result variable if following section of code executed?
int a=5, b=11, c = 3, d=4;
int result = (a+b*c)/4;
a.12
b.10
c.9
d.9.5
23.Which of the correct comparison operator?
a.:=
b.=
c.||
d.==
24.What will be the values of variables after executing following statement?
int a = 3, b= 5;
int result = a++ * b-- ;
a.a = 3, b = 5, result =20
b.a = 3, b = 5, result =15
c.a = 4, b = 4, result =15
d.a = 4, b = 4, result =20
25.How many times following section of program displays “Hello C”
int x = 10;
while(x)
lcd.print(“Hello C”);
a.10
b.9
c.infinite
d.0
Explanation / Answer
Asnwer 25 : c.Infinite
Description : x=10 and while(10) will be always true.
Answer 24 : a=4.b= 4,result= 15
Description : a=4 : initally a was 3 and a++ results a to be incremented by 1 so a becomes 4
similarly b-- causes b to be decremented by 1 which becomes 4.
As both are post operation i.e. post increment and post decrement so result = 3 * 5 = 15
Answer 23.Which of the correct comparison operator?
==
Answer 22 : The expression int result = (a+b*c)/4;
====> result = (5+(11*3))/4
====> result = (5+33)/4
====> result = 38/4
====> result = 9
Answer 21 Which of the following represent comments in C?
d./*……*/
Answer 20: What is the maximum value you can store in signed integer variable in Arduino programs?
c) 65535
Answer 19 Static variable has a scope limited to (In C)
a.program file only
Note : For such multiple type questions you should post questions in bunch of 5 questions.
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