Practice Test: Question Set - 18
1. Polarization of light forms the working principle of a
- (A) Polarimeter
- (B) Polarograph
- (C) Chromatograph
- (D) Spectrometer
2. An amplitude ratio of 0.1 corresponds to _________ decibels.
- (A) 20
- (B) -20
- (C) 10
- (D) -10
3. The transfer function for a PID controller is (where, τ i is the integral (reset) time and τD is the derivative time.
- (A) Kc(1 + τis +
τD ). s
- (B) Kc[1 + (1/τis) + τD . s]
- (C) Kc(1 + τis +
(1/τD . s)
- (D) None of these
4. Emf developed by a thermocouple while measuring a temperature of 400°C is 22 mV. The type of thermocouple used is
- (A) Chromel-alumel
- (B) Iron-constantan
- (C) Platinum-rhodium
- (D) Platinum-platinum + rhodium
5. Stalagmometer is used for the measurement of
- (A) Kinematic viscosity
- (B) Surface tension
- (C) Refractive index
- (D) Optical activity
6. 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) √(AT)
- (D) 1.5 AT
7. The symbol for "capillary line" in instrumentation diagram is
8. Gas analysis is commonly done using the
- (A) Thermal conductivity cell
- (B) X-ray diffraction
- (C) Mass spectrometer
- (D) Emission spectrometer
9. Which of the systems having the following transfer function is stable?
- (A) 1/(S2 + 2)
- (B) 1/(S2 - 2S + 3)
- (C) 1/(S2 + 2S + 2)
- (D) exp (-20 S)/(S2 + 2S - 1)
10. Load cells are used for the measurement of
- (A) Stress
- (B) Weight
- (C) Strain
- (D) Velocity
11. Which of the following fluid flow measuring devices can measure the largest flow rate?
- (A) V-notch
- (B) Rotameter
- (C) Orificemeter
- (D) Weir
12. 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)
13. The operation of a Rotameter is based on
- (A) Variable flow area
- (B) Rotation of a turbine
- (C) Pressure drop across a nozzle
- (D) Pressure at a stagnation point
14. Out of the following thermocouple wire insulating material, the highest temperature rating is for
- (A) Teflon
- (B) Ceramic fibre
- (C) Asbestos
- (D) Fibre glass
15. 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