Instrumentation Engineering MCQs

Instrumentation Engineering MCQs

Answer these 30 Instrumentation Engineering MCQs and assess your grip on the subject of Instrumentation Engineering.
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1:

What would be the simplified form of the function given below using the Karnaugh map?

f=∑(0,3,7,11,14) + d∑(5,12,15)

(Where

A.  

Ā.C 

B.  

A.B

C.  

C.D + A.B  

D.  

C.D

2:

What would be the decimal number of the following excess-3 code?

Excess-3 code = 1010 0101


A.  

27 

B.  

52 

C.  

67 

D.  

72 

3:

This question is based upon the figure shown below

In the above figure, initial value of the base current is 30 µA and the beta rating of the component is 300. If the base current (IB) increases from 30 µA to 60 µA, then what would be the change in the value of the collector current(Ic)?

A.  

6 mA

B.  

7 mA  

C.  

8 mA 

D.  

9 mA 

4:

A light dependent resistor has a resistance of 200 ohms at a certain light level. It can only handle a current of 20 milliamps before it risks heating up.

If the LDR (Light Dependent Resister) is connected to a 40V supply, what would be the value of resistor we place in series?


A.  

1600 ohms 

B.  

1650 ohms  

C.  

1700 ohms 

D.  

1800 ohms

5:

Which of the following statements is/are false?

(1) Fuzzy logic follows the principle of Aristotle and Buddha.

(2) The AND, OR, and NOT logical operators of Boolean logic are called Zadeh operators in Fuzzy logic.


A.  

(1) only

B.  

(2) only

C.  

Both (1) and (2)

D.  

None of the above

6: If the refractive indices for the core and cladding of an optical fibre are 1.7 and 1.5 respectively. What would be the acceptance angle of the optical fibre?

A.   53.1 degree

B.   49.1 degree

C.   33.1 degree

D.   38.1 degree

7:

State True/ False:

The system y(t) = 4x2(t) is time invariant.


A.  

True 

B.  

False

8: If a sinusoidal wave of angular frequency 1400 rad/s applied to the Y-Y plates of a Cathode Ray Oscilloscope produces six horizontal tangent points and five vertical tangent points, then what would be the frequency of the sinusoidal waveform applied to the X-X plates?

A.   1680 rad/s

B.   1750 rad/s

C.   1820 rad/s

D.   1875 rad/s

9: The meter constant of 6A, 220V dc watt-hour meter is 3365 revolutions per kWh. What would be the number of revolutions in one minute?

A.   70.03 r.p.m

B.   64.03 r.p.m

C.   69.03 r.p.m

D.   74.03 r.p.m

10:

This question is based upon the figure shown below

A four-arm a.c. bridge network is shown in the figure above whose arms PQ has a non-reactive resistor of 1400Ω in parallel with a condenser having capacitance of 0.5µF, QR has a non-reactive resistor of 700Ω, RS has an unknown inductive resistor and SP has a non-reactive resistor of 400Ω. If it is given that the network is balanced, what would be the values of the unknown resistance and inductance across RS?

A.  

Rx = 250Ω, Lx = 240 mH

B.  

Rx = 220Ω, Lx = 200 mH

C.  

Rx = 200Ω, Lx = 140 mH 

D.  

Rx = 150Ω, Lx = 140 mH

11:

This question is based upon the figure shown below

A 4-bit serial-in parallel-out shift register is given in the above figure. Its initial contents are given as 0101. If three clock pulses (CLK) are applied then what would the final contents of the shift register be?

A.  

0000 

B.  

0101 

C.  

1010 

D.  

1111 

12: An 8-bit digital to analog converter uses BCD input and produces a full-scale output of 9.90 Volt. What would be the analog output for the BCD input 1001 0101?

A.   9.9V

B.   9.5V

C.   8.9V

D.   8.5V

13: Which of the following gates is a universal gate?

A.   AND gate

B.   XNOR gate

C.   XOR gate

D.   NAND gate

14:

This question is based upon the figure shown below

A potential divider circuit is given in the above figure. What would be its output voltage (Vout), if the supplied voltage (VS) is 8V?

A.  

1.29 V 

B.  

2.29 V

C.  

3.26 V

D.  

3.23 V

15:

Which of the following are the main modules of a mass spectrometer instrument?

I) Mass analyzer

II) Extraction system

III) Detector

IV) Ionizer


A.  

I, II, and III 

B.  

I, III, and IV

C.  

II, III, and IV 

D.  

I, II, III, and IV

16: A 3mA meter having internal resistance of 100 ohm is to be converted to 0-160mA ammeter. What would be the value of the shunt resistance required?

A.   1.911 ohm

B.   1.351 ohm

C.   1.221 ohm

D.   2.121 ohm

17: Which of the following statements is false?

A.   Hydraulic systems are generally more difficult to operate as compared to pneumatic applications.

B.   Most hydraulic applications generally use bigger components than pneumatic applications.

C.   Hydraulic system is operated with compressed air while Pneumatic system is operated by pressurised oil.

D.   None of the above

18:

This question is based upon the figure shown below

What would be the period (T) of the periodic signal as shown in the above image?

A.  

π/2  

B.  

π/4

C.  

π/3

D.  

π/6

19:

This question is based upon the figure shown below

Which of the following is the simplified form of the Boolean expression as given in the above figure?

A.  

AB 

B.  

BC 

C.  

2BC 

D.  

None of the above

20:

This question is based upon the figure shown below

What would be the value of IC from the above circuit?

A.  

19.9 mA 

B.  

14.9 mA

C.  

17.9 mA

D.  

21.9 mA

21: If a clamper has a capacitor of capacitance, C = 0.02µF and resistance, R=400 KΩ, then what would be the total discharge time for the capacitor?

A.   4 ms

B.   4.5 ms

C.   20 ms

D.   40 ms

22: Which of the following statements is false about Linear Convolution?

A.   The length of the input sequence can be different.

B.   Zero padding is not required.

C.   Output sequence is non-periodic.

D.   The length of the output sequence will not be greater than the length of input sequences.

E.   None of the above

23:

This question is based upon the figure shown below

An array from the polynomial s4 + 2s3 + 6s2 + 2s + 20 is given above to apply Routh criterion. What would be the value of the term indicated as "??" in the given array?

A.  

-4

B.  

5

C.  

-6

24: To convert a JK flip-flop into a T flip-flop, what would be the input values of J and K?

A.   J=K=0

B.   J=K=1

C.   J=0, K=1

D.   J=1, K=0

E.   None of the above

25:

State True/False:

An operational amplifier produces an output voltage that is typically hundreds of thousands of times larger than the voltage difference between its input terminals.


A.  

True 

B.  

False

26:

This question is based upon the figure shown below


To measure the capacitive impedance at a frequency of 3 kHz, a capacitance comparison bridge is used. Choose the correct equivalent series circuit of the unknown impedance if the bridge constants at bridge balance are given as:


C3 = 11 µF, R1 = 1.3 kΩ, R2 = 110 kΩ, R3 = 130 kΩ



A.  

1

B.  

2

C.  

3

D.  

4

27:

This question is based upon the figure shown below

What would be the value of current through resistance R1 in the above circuit?

A.  

32.8 mA

B.  

38.5 mA

C.  

42.3 mA

D.  

52.5 mA

28:

This question is based upon the figure shown below

From the above circuit diagram, what would be the approximate value of unknown voltage V1?

A.  

2V

B.  

3V

C.  

4V 

D.  

5V

29: Which of the following statements is false about Voltmeter?

A.   It is a voltage-measuring device, which measures potential difference between the two points of a circuit.

B.   It is always connected in parallel with the circuit.

C.   Its resistance is very less.

D.   Deflecting torque in voltmeter is produced by a current, which is proportional to the voltage to be measured.

30: What would be the cut-off frequency, if a low-pass filter is built with a 20 nF capacitor and a 10 KΩ resistor?

A.   796.2 Hz

B.   596.3 Hz

C.   630.4 Hz

D.   581.2 Hz

31: If 400 fringes cross the centre of the field of view by moving one mirror through a distance of 0.1347mm in a Michelson Interferometer, then what would be the wavelength of the light?

A.   4323 Å (Angstrom)

B.   5388 Å (Angstrom)

C.   6735 Å (Angstrom)

D.   8321 Å (Angstrom)

32: Which of the following statements is false?

A.   Piezoelectric materials are crystalline materials which when compressed along one of its axes; acquire an electrostatic charge on opposite faces of material.

B.   Piezoelectric transducers are active transducers and do not require any external source of energy.

C.   Piezoelectric transducers can be used to measure only limited number of quantities.

D.   A piezoelectric transducer has very low DC output impedance.

E.   None of the above

33:

This question is based upon the figure shown below

State True/False:

The Signal shown in the above image is periodic.


A.  

True 

B.  

False

34: Which of the following Boolean algebra expressions is incorrect?

A.   A+A.B = A

B.   A.(A+B) = A

C.   A.1 = 1

D.   A+1 = 1

35:

State True/False:

When the Wheatstone bridge is balanced, the current through galvanometer is zero.


A.  

True 

B.  

False

36: If the H+ concentration is 3.0*10-3 M, then the pH value of a solution will be ____.

A.   4.52

B.   3.52

C.   2.52

D.   1.52

37: What would be the peak output voltage of a positive clamp, if an input signal of peak value 7V is applied with a bias of 4V?

A.   24 V

B.   18 V

C.   14 V

D.   11V

38: A closed loop of voltages is given in the above figure. According to the Kirchhoff's second law, V1+V2+V3+V4= _____.

A.   1

B.   0

C.   Infinite

D.   None of the above

39: The inverse Discrete Fourier Transformation of x(n), an N-periodic signal can be expressed as ________.

A.   1

B.   2

C.   3

D.   4