# Practice Test: Question Set - 13

**1. Dome temperature of blast furnace stove is most accurately measured by a**

- (A) Radiation pyrometer

- (B) Platinum-platinum/rhodium thermocouple

- (C) Iron-constantan thermocouple

- (D) Platinum resistance thermometer

**2. Resistance of a gas in a vessel is given by (where,**

*P*= pressure,*V*= volume of the vessel,*n*= no. of moles of the gas,*R*= gas constant)- (A)

*V*/

*nRT*

- (B)

*nRT*/

*V*

- (C)

*nRT*/

*P*

- (D)

*P*/

*nRT*

**3. The term analogous to voltage in a single tank system is the**

- (A) Heat content of the system

- (B) Liquid volume in the tank

- (C) Flow rate

- (D) Level of liquid

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

- (A) Rotameter

- (B) Flow nozzle

- (C) Orificemeter

- (D) Venturimeter

**5. A negative gain margin expressed in decibels means a/an _________ system.**

- (A) Stable

- (B) Unstable

- (C) Critically damped

- (D) None of these

**6. ________ stability method uses open loop transfer function.**

- (A) Nyquist

- (B) Mikhailov

- (C) Ruth

- (D) None of these

**7. Humidity of air can be determined by a**

- (A) Chromatograph

- (B) Sling psychrometer

- (C) Mass spectrometer

- (D) Polarimeter

**8. The unit of 'time constant' of a system is the same as that of**

- (A) Velocity

- (B) Time

- (C) (Time)

^{-1}

- (D) None of these

**9. In a single tank system, the transfer function of level to inlet flow rate is**

- (A)

*R*/

*TS*

- (B)

*R*/(

*TS*+ 1)

- (C) 1/

*TS*

- (D) None of these

**10. An aneroid barometer measures the ________ pressure.**

- (A) Atmospheric

- (B) Absolute

- (C) Vacuum

- (D) Gage

**11. Pick out the wrong statement**

- (A) Proportional controller is normally used for
level control in industrial applications

- (B) CSTR can be considered as a distributed parameter system

- (C) Distributed parameter approach gives partial differential equation

- (D) Non-linear behavior is exemplified by an on-off controller

**12. What is the Laplace transform of impulse input having magnitude ‘X’?**

- (A)

*X*

- (B)

*X*

^{2}

- (C) 1/

*X*

- (D) 1

**13. 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) Both real and negative

- (D) One real positive and the other real negative

**14. The offset introduced by proportional controller with gain**

*K*in response of first order system can be reduced by_{c }- (A) Reducing value of

*K*

_{c}- (B) Introducing integral control

- (C) Introducing derivative control

- (D) None of the above

**15. Which thermocouple can be used to measure a temperature of around 1400°C?**

- (A) Copper-constantan

- (B) Aluminium-Chromel

- (C) Platinum-platinum + rhodium

- (D) None of these

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