21
Which of the following is not a second order instrument?
A)
Mercury in glass thermometer with covering
B)
Bare mercury in glass thermometer
C)
Pressure gauge with one bellow, two tubes and a tank
D)
None of these
Answer & Solution
Answer: Option
B
22
Which of the following is not the triple point of water?
A)
32°R
B)
273°K
C)
492°R
D)
32°F
Answer & Solution
Answer: Option
A
23
The frequency response of a first order system, has a phase shift with lower and upper bounds given by
A)
$$ - \infty ,\,\frac{\pi }{2}$$
B)
$$ - \frac{\pi }{2},\,\frac{\pi }{2}$$
C)
$$ - \frac{\pi }{2},\,0$$
D)
$$0,\,\frac{\pi }{2}$$
Answer & Solution
Answer: Option
D
24
Stabilising time for the controllers is the time required for the response to reach __________ percent of its ultimate value.
A)
63.2
B)
87.5
C)
95
D)
100
Answer & Solution
Answer: Option
C
A)
One cell
B)
Two cells
C)
Three cells
D)
No cell
Answer & Solution
Answer: Option
B
26
Phase margin is equal to
A)
180° - phase lag
B)
Phase lag - 180°
C)
Phase lag + 180°
D)
Phase lag + 90°
Answer & Solution
Answer: Option
A
27
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 behaviour is exemplified by an on-off controller
Answer & Solution
Answer: Option
B
28
Pick out the wrong statement.
A)
O2 , NO and NO2 exhibit paramagnetic properties as a result of unpaired electrons
B)
CO2 is the strongest paramagnetic gas
C)
Paramagnetic susceptibility of gases decreases with temperature
D)
Paramagnetic susceptibility of gases permits the measurement of their concentration
Answer & Solution
Answer: Option
B
29
Pick out the wrong statement.
A)
There is no transfer lag for a single first order system
B)
Stirred tank with a water jacket exemplifies an interacting system
C)
Transfer lag is a characteristics of all higher order systems (other than first order systems)
D)
Transfer lag decreases as the number of stages decreases
Answer & Solution
Answer: Option
D
30
Emf generated in a thermocouple depends on the temperature
A)
Of cold junction only
B)
Of hot junction only
C)
Difference between hot and cold junctions
D)
Difference between cold junction and atmospheric temperature
Answer & Solution
Answer: Option
C
