Comprehension and Aptitude Skills Lab - End Assessment - Part A - Section - B

1. Which of the following gates is universal gate?

NOT

OR

AND

NOR

2. A circuit whose output is proportional to the difference between the input signals is considered to be which type of amplifier?

Common-mode

Operational

Differential

Darlington

3. Flapper nozzle is used in a/an __________ controller

Pneumatic

Electronic

Hydraulic

None of these

4. Thermal wells are used in the temperature measurement to

Reduce measuring lag

Increase the sensitivity

Guard against corrosive and oxidising action on thermocouple materials

Increase the fidelity

5. Maxwell bridge is used for measurement of

Frequency

Capacitance

Inductance

Resistance

6. The voltage follower has a

Closed-loop bandwidth of zero

Small open-loop voltage gain

Closed-loop voltage gain of unity

Large closed-loop output impedance

7. Response of a system to a sinusoidal input is called __________ response.

Frequency

Impulse

Unit step

None of these

8. Ohm's law is not applicable to

Option 1

Semi-conductors

High currents

DC circuits

9. Which is the octal form of the decimal number 29?

29

35

10

13

10. A negative gain margin expressed in decibels means a/an __________ system.

Critically damped

Stable

Unstable

None of these

11. An XOR gate produces output only when two inputs are

High

Low

Equal

Different

12. Load cells are used for the measurement of

Velocity

Stress

Strain

Weight

13. A TRIAC:

Can trigger only on positive gate voltages

Can trigger only on negative gate voltages

Can be triggered by either a positive or a negative gate voltage

Cannot be triggered with gate voltages

14. The closed loop pole of a stable second order system could be

Both real and positive

Complex conjugate with positive real parts

One real positive and the other real negative

Both real and negative

15. Magnetic flowmeters are generally not used for the velocity/flow measurement of hydrocarbons due to their

Low thermal conductivity

Low electrical conductivity

Low flash point

High viscosity index

16. In a DMA write operation the data is transferred

From I/O to memory

From memory to I/O

From memory to memory

From I/O to I/O

17. What is the moving part of a linear variable differential transformer?

Primary

Secondary

Diaphragm

Core

18. Op-amps used as high- and low-pass filter circuits employ which configuration?

Open-loop

Noninverting

Comparator

Inverting

19. An astable multivibrator is also known as a

One-shot multivibrator

Bistable multivibrator

Free-running multivibrator

Monostable multivibrator

20. The ratio between differential gain and common-mode gain is called

Common-mode rejection

Differential-mode rejection

Phase

21. The resolution of an indicating instrument is

The smallest change in the output reading due to drifting of pointer

The smallest change in the applied stimulus that will indicate the detectable change in the reflection

The difference between various readings for the same applied stimulus

None of these

22. Psychrometer determines the

Humidity of gases

Moisture content of solids

Hygroscopic nature of solids

Water of crystallisation

23. In a transistor, collector current is controlled by:

Base current

Collector voltage

Collector resistance

All

24. Most important advantage of an IC is its Most important advantage of an IC is its

Very low cost

Extremely high reliability

Extremely small size

Very small weight

25. Pick out the first order system from among the following.

Interacting system of two tanks in series

Non-interacting system of two tanks in series

Damped vibrator

Mercury in glass thermometer kept in boiling water

26. The temperature of tempering oil baths maintained at 400°C during heat treatment of steel is measured by a/an __________ thermocouple.

Platinum-platinum/rhodium

Chromel-alumel

Iron-constantan

None of these

27. The time constant of a unity gain, first order plus time delay process is 5 min. If the phase lag at a frequency of 0.2 rad/min is 60°, then the dead time (in minutes) is

π/12

5π/12

π/6

π/3

28. A noninverting closed-loop op-amp circuit generally has a gain factor

Of zero

Greater than one

Less than one

Equal to one

29. When transistors are used in digital circuits they usually operate in the

Breakdown region

Linear region

Saturation and cutoff regions

Active region

30. Which of the following is not a differential pressure flow meter ?

Flow nozzle

Rotameter

Venturimeter

Orificemeter

31. Pirani gauge is used for the measurement of

Liquid level under pressure

Liquid level at atmospheric pressure

High vacuum

Very high pressure

32. Which of the following controllers has maximum offset ?

P-controller

P-I controller

P-D controller

P-I-D controller

33. What does a hall effect sensor sense?

Temperature

Moisture

Magnetic fields

Pressure

34. Kelvin double bridge is best suited for the measurement of

Inductance

Capacitance

Low resistance

High resistance

35. Which of the following thermocouples will give the highest output for the same value of hot and cold junction temperature ?

Platinum-platinum + rhodium

Iron-constantan

Chromel-constantan

All will give the same output

36. A typical example of a physical system with under damped characteristic is a

Thermocouple kept immersed in a liquid filled thermowell

Spring loaded diaphragm valve.

U-tube manometer

CSTR with first order reaction

37. Working principle of radiation pyrometer is based on the

Kirchoffs law

Seebeck effect

Wien's law

Stafan-Boltzman law

38. The SCR can be termed as

DC switch

AC switch

Square-wave switch

Either DC or AC switch

39. Bode diagram are generated from output response of the system subjected to which of the following input?

Impulse

Sinusoidal

Ramp

Step

40. An ideal operational amplifier has

Infinite bandwidth

Infinite output impedance

Zero input impedance

All

41. The amplitude ratio for the sinusoidal response of a __________ is 1.

First order system

Second order system

Transportation lag

None of these

42. Which of the following recorder gives slow response

X-Y recorder

Oscillographic

Galvanometric

Magnetic

43. Positioning controllers are used for

Temperature changes

Low loads

High loads

Flow rate changes

44. Which of the following relates the emf. generated in a single homogeneous wire to the temperature difference ?

Peltier effect

Seebeck effect

Thomson effect

None of these

45. Which of the following controllers has the least maximum deviation ?

P-controller

P-I controller

P-I-D controller

P-D controller

46. Nichol's chart deals with

Frequency response values of controllers

Closed loop values Vs frequency response values

Closed loop values Vs open loop values

Open loop values Vs frequency response values

47. Which instrument has the lowest resistance?

Voltmeter

Ammeter

Megger

Frequency meter

48. A system with a double pole at the origin is unstable since the corresponding term in the time domain

Is a constant

Grows exponentially with time

Grows linearly with time

Decays linearly with time

49. On-off controllers are normally used for

Flow rate changes

Temperature changes

Low loads

None of these

50. Which of the following is the dynamic characteristics of an instrument ?

Sensitivity

Dead zone

Reproducibility

Fidelity

Comprehension and Aptitude Skills Lab - End Assessment - Part A - Section - B

1. Which of the following gates is universal gate?

2.

What first name or nickname would you like us to use?

2. A circuit whose output is proportional to the difference between the input signals is considered to be which type of amplifier?

3. Flapper nozzle is used in a/an __________ controller

4. Thermal wells are used in the temperature measurement to

5. Maxwell bridge is used for measurement of

6. The voltage follower has a

7. Response of a system to a sinusoidal input is called __________ response.

8. Ohm's law is not applicable to

9. Which is the octal form of the decimal number 29?

10. A negative gain margin expressed in decibels means a/an __________ system.

11. An XOR gate produces output only when two inputs are

12. Load cells are used for the measurement of

13. A TRIAC:

14. The closed loop pole of a stable second order system could be

15. Magnetic flowmeters are generally not used for the velocity/flow measurement of hydrocarbons due to their

16. In a DMA write operation the data is transferred

17. What is the moving part of a linear variable differential transformer?

18. Op-amps used as high- and low-pass filter circuits employ which configuration?

19. An astable multivibrator is also known as a

20. The ratio between differential gain and common-mode gain is called

21. The resolution of an indicating instrument is

22. Psychrometer determines the

23. In a transistor, collector current is controlled by:

24. Most important advantage of an IC is its Most important advantage of an IC is its

25. Pick out the first order system from among the following.

26. The temperature of tempering oil baths maintained at 400°C during heat treatment of steel is measured by a/an __________ thermocouple.

27. The time constant of a unity gain, first order plus time delay process is 5 min. If the phase lag at a frequency of 0.2 rad/min is 60°, then the dead time (in minutes) is

28. A noninverting closed-loop op-amp circuit generally has a gain factor

29. When transistors are used in digital circuits they usually operate in the

30. Which of the following is not a differential pressure flow meter ?

31. Pirani gauge is used for the measurement of

32. Which of the following controllers has maximum offset ?

33. What does a hall effect sensor sense?

34. Kelvin double bridge is best suited for the measurement of

35. Which of the following thermocouples will give the highest output for the same value of hot and cold junction temperature ?

36. A typical example of a physical system with under damped characteristic is a

37. Working principle of radiation pyrometer is based on the

38. The SCR can be termed as

39. Bode diagram are generated from output response of the system subjected to which of the following input?

40. An ideal operational amplifier has

41. The amplitude ratio for the sinusoidal response of a __________ is 1.

42. Which of the following recorder gives slow response

43. Positioning controllers are used for

44. Which of the following relates the emf. generated in a single homogeneous wire to the temperature difference ?

45. Which of the following controllers has the least maximum deviation ?

46. Nichol's chart deals with

47. Which instrument has the lowest resistance?

48. A system with a double pole at the origin is unstable since the corresponding term in the time domain

49. On-off controllers are normally used for

50. Which of the following is the dynamic characteristics of an instrument ?