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process ctrl inst > section 3 > Flashcards

section 3 Flashcards

1
Q

The temperature range for which copper
resistance thermometer can be used is __________
°C
a. 0 to 150
b. -200 to 150
c. 350 to 750
d. 500 to 900

A

b

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2
Q

Paramagnetism method is not used for the
composition determination of __________ in gases.
a. Oxygen
b. oxides of nitrogen
c. carbon dioxide
d. any of these

A

c

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3
Q

An amplitude ratio of 0.1 corresponds to
__________ decibels.
a. 20
b. -20
c. 10
d. -10

A

b

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4
Q

For increased speed of response of an expansion
pressure spring thermometer, the thermometer bulb
should have a
a. large area but small mass.
b. high thermal conductivity.
c. small specific heat.
d. all’a’, ‘b’ & ‘c’.

A

d

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5
Q

Pressure of 0.0001 absolute psi can be measured
by __________ gauge.
a. Mcloid
b. Pirani
c. Thermocouple
d. none of these

A

a

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6
Q

Pirani gauge is used for the measurement of
a. very high pressure.
b. high vacuum.
c. liquid level under pressure.
d. liquid level at atmospheric pressure

A

b

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7
Q

The __________ of the fluid contained in the
temperature sensing element (i.e., bulb) of filled
system thermometers changes with change in
temperature.
a. Pressure
b. Volume
c. Viscosity
d. all (a), (b) and (c)

A

d

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8
Q

Transfer functions X/Y for which of the
following block diagrams is (GG1+GG1.GG2.GG3)/(1+GG2.GG3)

A

a

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9
Q

The characteristic equation for the control
system with a closed loop transfer function G1/1 +
G2 is given by 1 + G2 = 0. The characteristic
equation for the control system
a. depends only upon the open loop transfer
function.
b. determines its stability.
c. is the same for set point or load changes.
d. all ‘a’, ‘b’ & ‘c’

A

d

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9
Q

__________ thermometer can not measure sub-
zero (< 0° C) temperature,

a. Mercury in glass
b. Bimetallic
c. Vapor pressure
d. Resistance

A

b

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10
Q

Starting temperature of optical radiation
pyrometer is __________ °C.
a. 800
b. 400
c. 1200
d. 1500

A

a

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11
Q

Liquid argon level in a pressurised storage tank (at 3 kg/cm2) is measured by a/an
a. gage glass
b. external float gage
c. differential pressure gage
d. none of these

A

c

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12
Q

What is the dynamic error in a critically damped
second order instrument for a ramp input (At) ?
a. 0.5 AT
b. 2 AT
c. sqrt(AT)
d. 1.5 AT

A

b

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12
Q

Which of the systems having following transfer
functions is stable?
a. 1/(s2+ 2)
b. 1/(s2-2s + 3)
c. 1/(s2 + 2s + 2)

A

c

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13
Q

The transfer function for a first order process
with time delay is
a. e^(Td.S)
b. e^-(Td.S)/(TS+1)
c. 1/((TS+1)(TdS+1)
d. TdS/(TS+1)

A

b

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14
Q

An ideal PID controller has the transfer function
�1 + 1
0.55 + −0.25� . The frequency at which the
magnitude ratio of the controller is 1, is
a. 0.5/0.2
b. 0.2/0.5
c. 0.2 x 0.5
d. 1/sqrt(0.2 x 0.5)

A

d

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15
Q

The deflection of the free end of the bimetallic
strips in a bimetallic thermometer with temperature
is nearly
a. Linear
b. Non-linear
c. Parabolic
d. hyperbolic

A

a

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16
Q

Alphatron measures pressure __________
microns.
a. < 1
b. < 3
c. > 3
d. < 0.1

A

c

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17
Q

What is the ratio of output amplitude to input
amplitude for a sinusoidal forcing function in a first
order system ?
a. 1
b. >1
c. < 1
d. none of these

A

c

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18
Q

The unit step response of the transfer function
(2s−1)/(3s+1)(4s+1) reaches its final steady state
assymptotically after
a. a monotonic increase.
b. a monotonic decrease.
c. initially increasing and then decreasing.
d. increasing decreasing and then increasing.

A

a

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19
Q

A process is initially at steady state with its
output y=l for an input u=l. The input is suddenly
changed to 2 at time t=0. The output response is
y(t)=1+2t. The transfer function of the process is
a. 2/s
b. 1+(2/S^2)
c. 1+2/S
d. (1/S)(1+2/S)

A

d

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20
Q

The term analogous to the electrical current in a
thermal system is the
a. temperature difference
b. heat flow rate
c. heat content in the system
d. none of these

A

b

21
Q

Reset rate is the another term used for
__________ time.
a. Dead
b. Integral
c. Derivative
d. none of these

A

b

22
Q

Continuous measurement of moisture in paper
is done by
a. sling psychrometer.
b. Hair-hygrometer.
c. Weighing.
d. high resistance Wheatstone’s bridge circuit.

A

d

23
Q

Psychrometer determines the
a. humidity of gases
b. moisture content of solids
c. water of crystallisation
d. hygroscopic nature of solids

A

a

24
Q

Which of the systems having the following
transfer function is stable ?
a. 1/(S^2+2)
b. 1/(S^S-2S+3)
c. 1/(S^2+2S+2)
d. exp(-20S)/(S^2+2S+1)

A

c

25
Q

The calibration data of a thermocouple with its
cold junction at 0°C are given below.

The hot junction of the thermocouple is placed in a
bath at 80°C, while its cold junction is at 20°C.
What is the emf of thermocouple?

a. 3.26 mv
b. 0.80 mv
c. 2.46 mv
d. 2.43 mv

A

c

26
Q
A
27
Q
A
28
Q

A mercury barometer measures the __________
pressure.
a. Atmospheric
b. Gauge
c. Vacuum
d. absolute

A

a

29
Q

Positioning controllers are used for
a. low loads
b. temperature changes
c. high loads
d. flow rate changes

A

c

30
Q

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

A

c

31
Q

The response of two tanks of same size and
resistance in series is
a. under damped
b. critically damped
c. over damped
d. none of the above

A

b

32
Q

The frequency response of a dynamic element
shows a constant magnitude ratio at all frequencies.
The element exhibits a negative phase shift at all
frequencies. The absolute value of the phase shift
increases linearly with frequency. The element has
the transfer function
a. E^(-Ts)
b. (T1s+1)/(T2s+1)
c. T1s/(T2s+1)
d. (T1s+1)/T2s

A

a

33
Q

The amplitude ratio for the sinusoidal response
of __________ is < 1.
a. transportation lag
b. first order system
c. second order system
d. none of these

A

b

34
Q

Which of the following is a ‘contact’ pyrometer?
a. resistance pyrometer
b. optical pyrometer
c. radiation pyrometer
d. infra red pyrometer

A

a

35
Q

Which of the following is not a speed measuring
instrument?
a. Psychrometer
b. Stroboscope
c. Tachometer
d. All (a), (b) and (c)

A

a

36
Q

Measurement of sub-zero Celcius temperature
in industry is done most commonly by
a. Thermocouples
b. resistance thermometers
c. gas thermometers
d. bi-metallic thermometers

A

b

37
Q

For the block diagram shown below:

a. τl S (τps + 1) + Kc . Kp (τlS + 1) e-τd s = 0
b. (τmS + 1) (τpS + 1) + Km . Kp e-τd S = 0
c. τl S(τm S + 1) (τp S + 1) +Kc . Kp . Km (τl
s + 1) e-τdS = 0
d. (τms + 1) (τp s + 1) + Kc . Kp . Km . e-τdS
= 0

A

c

38
Q

Use of I-control along with P-control facilitates
a. elimination of offset
b. reduction of offset
c. reduction of stability time
d. none of these

A

a

39
Q

Turbine flow meters are suitable for
a. very limited flow ranges.
b. cryogenic flow measurements.
c. aerospace and in air borne applications.
d. both (b) and (c).

A

d

40
Q

Liquid discharge from a tank or reservoir can
not be measured by
a. Orificemeters
b. Weirs
c. Mouthpieces
d. notches

A

a

41
Q

Which of the following is not a mechanical
pressure sensing element?
a. Bellows
b. Diaphragm
c. Bourdon tube
d. U-tube

A

d

42
Q

__________ are analysed using a polarograph.
a. Isotonic solutions
b. Solids
c. Liquids
d. Gases

A

b

43
Q

Which of the following judges the accuracy of
an instrument?
a. Dead zone
b. Drift
c. Static error
d. None of these

A

c

44
Q

On-off controllers are normally used for
a. low loads
b. temperature changes
c. flow rate changes
d. none of these

A

a

45
Q

Magnetic flowmeters are generally not used for
the velocity/flow measurement of hydrocarbons
due to their
a. low thermal conductivity.
b. low electrical conductivity.
c. high viscosity index.
d. low flash point.

A

b

46
Q

Which of the following controllers has
maximum offset?
a. P-controller
b. P-I controller
c. P-D controller
d. P-I-D controller

A

a

47
Q

Pressure of 0.01 psi (absolute) can be measured
by __________ gauge.
a. Ionisation
b. Pirani
c. Mcloid
d. none of these

A

c

48
Q

High temperature of around 2000°C of
incandescent gas mantles is measured by a/an
a. specially designed thermocouple.
b. optical pyrometer.
c. radiation pyrometer.
d. none of these.

A

c

49
Q

The unit step response of the transfer function
1/(s2 + 2s + 3)
a. has a non-zero slope at the origin.
b. has a damped oscillatory characteristics.
c. is overdamped
d. is unstable

A

b

50
Q

The experimental response of the controlled
variable y(t) for a step change of magnitude P in the
manipulated variable x(t) is shown below:

The appropriate transfer function of the process is
a. (Q/P)e^-(Q/R)s/(TdS+1)
b. (Q/R)e^-TdS/(Q/P)S+1
c. (Q/P)e^-TdS/(Q/R)S+1
d. (Q/R)e^-(P/Q)s/(TdS+1)

A

c

51
Q
A

process ctrl inst (7 decks)

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