A photo electric device in which the resistance of the metal is directly proportional to the light striking on it, is known as photo-conductive cell. Photoelectric transducers are used for the measurement of those parameters, which can be used to produce variation in_______________?

Related Mcqs:

1. Strain gage pressure transducers are used to measure _____________ pressures?

   A. Gage as well as vacuum
   B. Absolute as well as differential
   C. Both A. and B.
   D. Neither A. nor B.

2. Photoelectric pyrometers are suitable in the temperature range of ________________ °C?

   A. 400-1600
   B. 800-1600
   C. 800-2500
   D. 400-1000

3. All the thermocouples used for temperature measurement use dissimilar metal ________________?

   A. Strips
   B. Bars
   C. Wires
   D. Beads

4. The deflection in diaphragm (which is used as pressure sensor in pneumatic and electronic instruments) is dependent on the metal thickness, its diameter D. and shape & number of corrugations. Its deflection is proportional to_______________?

   A. d
   B. d2
   C. d3
   D. d4

5. 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.

6. Suppose that the gain, time constant and dead time of a process with the following transfer function: Gc(s) = 10 exp( – 0.1s)/(0.5s + 1) are known with a possible error of ± 20% of their values. The largest permissible gain Kc of a proportional controller needs to be calculated below taking the values of process gain, time constant and dead time as________________?

   A. 8, 0.6, 0.08
   B. 12, 0.6, 0.12
   C. 8, 0.6, 0.12
   D. 12, 0.4, 0.08

7. A sinusoidal variation in the input passing through a linear first order system _________________?

   A. Becomes more oscillatory (frequency increases)
   B. Becomes less oscillatory (frequency decreases)
   C. Gets amplified (magnitude increases)
   D. Gets attenuated (magnitude decreases)

8. The root locus plot of the roots of the characteristics equation of a closed loop system having the open loop transfer function K (s + 1)/[2 (2s + 1) (3s + 1)] will have a definite number of loci for variation of K from 0 to ∞. The number of loci is_______________?

   A. 1
   B. 2
   C. 3
   D. 4

9. Water is entering a storage tank at a temperature T0 and flow rate Q0 and leaving at a flow rate Q and temperature T. There are negligible heat losses in the tank. The area of cross-section of the tank is A0. The model that describes the dynamic variation of temperature of water in the tank with time is given as________________?

   A. Q0(T0 – T) = Ac . h (dT/dt)
   B. Q0T0 – QT = Ac . h (dT/dt)
   C. Q(T0 – T) = Ac . h (dT/dt)
   D. Q(T0 – T) = Ac . (dTH/dt)

10. Which of the following is not classified as a thermo electric pyrometer ?

    A. Resistance thermometer
    B. Thermocouple
    C. Optical pyrometer (disappearing filament type)
    D. Radiation pyrometer