section 7 Flashcards
Change of angle of refraction with composition
comprises the working principle of a
a. Polarimeter
b. Polarograph
c. Spectrometer
d. refractrometer
D
Which of the following instruments is not used
for measuring sub-zero (<0°) temperatures?
a. Platinum resistance thermometer
b. Mercury in glass thermometer
c. Vapor pressure thermometer
d. Radiation pyrometer
D
Which of the following is not suitable for
measuring the temperature of a red hot object in the
range of 800 - 1600°C?
a. Optical pyrometer
b. Radiation pyrometer
c. Photoelectric pyrometer
d. Thermocouples
D
Find the Laplace transform of the following input
function shown in figure.
A
Flame photometry is used for the determination
of compositional analysis of
a. Solids
b. alkali metals
c. natural gas
d. isotopes
B
Reference points i.e., ice point and steam point in
Reaumer temperature scale are respectively
a. 273° & 80°
b. 0° & 80°
c. 32° & 460°
d. 32° & 80°
B
Which of the following is not a composition
measuring instrument?
a. Thermal conductivity cell
b. Mass spectrometer
c. Polarograph
d. Hot wire anemometer
D
Emf developed by a thermocouple while
measuring a temperature of 800°C is about 31 mV.
The type of thermocouple used is
a. Chromel-alumel
b. Iron-constantan
c. Platinum-platinum+rhodium
d. none of these.
A
Which of the following thermocouples is
incapable of measuring sub-zero (i.e., < 0°C) temperature?
a. Chromel-alumel
b. Iron-constantan
c. Platinum-platinum + rhodium
d. Copper-constantan
C
Platinum resistance thermometer is the
international standard for temperature measurement
between
a. triple point of hydrogen and freezing
point of antimony
b. 13.81°K to 903.9°K
c. both (a) and (b)
d. neither (a) nor (b)
C
On-off control which is a special case of
proportional control, has a band width of about
__________ percent.
a. 100
b. 75
c. 25
d. 0
D
The thermal emf-temperature relationship of
most thermocouples is
a. Linear
b. Parabolic
c. Exponential
d. square root
B
Which is the strongest paramagnetic gas?
a. CO2
b. O2
c. NO
d. NO2
B
In Bode plot, A.R. vs. w is plotted on a/an
__________ graph paper.
a. Log-lag
b. Triangular
c. Ordinary
d. semi-log
A
- A first order system with unity gain and time
constant τ is subjected to a sinusoidal input of
frequency w = 1/τ. The amplitude ratio for this
system is
a. 1
b. 0.5
c. 1/sqrt2
d. 0.25
D
A control system has the following transfer
function FF(ss) = (ss−1)(ss+1)
ss(ss−2)(ss+4)
. The initial value of the
corresponding time function is
a. 1
b. 1⁄8
c. 7⁄8
d. -1
D
For measuring the temperature of a red hot
furnace, which is the most suitable instrument?
a. Platinum resistance thermometer
b. Thermocouple
c. Optical pyrometer
d. Bimetallic thermometer
C
Continuous measurement of specific gravity of
a liquid is done by
a. Hydrometer
b. contact-type electric indicators
c. displacement meter
d. both (a) and (c)
D