Comprehension And Aptitude Skills Lab - End Assessment - Part A - Section - B
This session carries 50 question to be answered in 60 minutes. Take time in answering.
- 1.Which of the following is the dynamic characteristics of an instrument ?
- A.
Sensitivity
- B.
Dead zone
- C.
Reproducibility
- D.
Fidelity
- 2.Flapper nozzle is used in a/an __________ controller
- A.
Pneumatic
- B.
Electronic
- C.
Hydraulic
- D.
None of these
- 3.The temperature of tempering oil baths maintained at 400°C during heat treatment of steel is measured by a/an __________ thermocouple.
- A.
Platinum-platinum/rhodium
- B.
Chromel-alumel
- C.
Iron-constantan
- D.
None of these
- 4.The closed loop pole of a stable second order system could be
- A.
Both real and positive
- B.
Complex conjugate with positive real parts
- C.
One real positive and the other real negative
- D.
Both real and negative
- 5.Working principle of radiation pyrometer is based on the
- A.
Kirchoffs law
- B.
Seebeck effect
- C.
Wien's law
- D.
Stafan-Boltzman law
- 6.Which of the following relates the emf. generated in a single homogeneous wire to the temperature difference ?
- A.
Peltier effect
- B.
Seebeck effect
- C.
Thomson effect
- D.
None of these
- 7.Response of a system to a sinusoidal input is called __________ response.
- A.
Frequency
- B.
Impulse
- C.
Unit step
- D.
None of these
- 8.Load cells are used for the measurement of
- A.
Velocity
- B.
Stress
- C.
Strain
- D.
Weight
- 9.Pick out the first order system from among the following.
- A.
Interacting system of two tanks in series
- B.
Non-interacting system of two tanks in series
- C.
Damped vibrator
- D.
Mercury in glass thermometer kept in boiling water
- 10.A negative gain margin expressed in decibels means a/an __________ system.
- A.
Critically damped
- B.
Stable
- C.
Unstable
- D.
None of these
- 11.Which of the following controllers has the least maximum deviation ?
- A.
P-controller
- B.
P-I controller
- C.
P-I-D controller
- D.
P-D controller
- 12.Which of the following is not a differential pressure flow meter ?
- A.
Flow nozzle
- B.
Rotameter
- C.
Venturimeter
- D.
Orificemeter
- 13.A typical example of a physical system with under damped characteristic is a
- A.
Thermocouple kept immersed in a liquid filled thermowell
- B.
Spring loaded diaphragm valve.
- C.
U-tube manometer
- D.
CSTR with first order reaction
- 14.Nichol’s chart deals with
- A.
frequency response values of controllers
- B.
Closed loop values Vs frequency response values
- C.
Closed loop values Vs open loop values
- D.
Open loop values Vs frequency response values
- 15.Which of the following thermocouples will give the highest output for the same value of hot and cold junction temperature ?
- A.
Platinum-platinum + rhodium
- B.
Iron-constantan
- C.
Chromel-constantan
- D.
All will give the same output
- 16.A system with a double pole at the origin is unstable since the corresponding term in the time domain
- A.
Is a constant
- B.
Grows exponentially with time
- C.
Grows linearly with time
- D.
Decays linearly with time
- 17.Thermal wells are used in the temperature measurement to
- A.
Reduce measuring lag
- B.
Increase the sensitivity
- C.
Guard against corrosive and oxidising action on thermocouple materials
- D.
Increase the fidelity
- 18.Psychrometer determines the
- A.
Humidity of gases
- B.
Moisture content of solids
- C.
Hygroscopic nature of solids
- D.
Water of crystallisation
- 19.Positioning controllers are used for
- A.
Temperature changes
- B.
Low loads
- C.
High loads
- D.
Flow rate changes
- 20.The amplitude ratio for the sinusoidal response of a __________ is 1.
- A.
First order system
- B.
Second order system
- C.
Transportation lag
- D.
None of these
- 21.Pirani gauge is used for the measurement of
- A.
Liquid level under pressure
- B.
Liquid level at atmospheric pressure
- C.
High vacuum
- D.
Very high pressure
- 22.Bode diagram are generated from output response of the system subjected to which of the following input?
- A.
Impulse
- B.
Sinusoidal
- C.
Ramp
- D.
Step
- 23.Which of the following controllers has maximum offset ?
- A.
P-controller
- B.
P-I controller
- C.
P-D controller
- D.
P-I-D controller
- 24.On-off controllers are normally used for
- A.
Flow rate changes
- B.
Temperature changes
- C.
Low loads
- D.
None of these
- 25.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
- A.
π/12
- B.
5π/12
- C.
π/6
- D.
π/3
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