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.Management Sciences
Category: Process Control and Instrumentation
Normal mercury thermometer can be used to measure a temperature of about 300°C. However, its maximum temperature measurement range can be increased upto about 500°C by__________________?
A. Filling nitrogen under pressure in the stem
B. Increasing the diameter of the tube
C. Using steel tube in place of glass tube
D. Accounting for the tube expansion
Which of the following relates the emf. generated in a single homogeneous wire to the temperature difference ?
A. Peltier effect
B. Thomson effect
C. Seebeck effect
D. None of these
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-ηS
B. (T1S + 1)/(T2S + 1)
C. (T1S/(T2S + 1)
D. (T1S + 1)/(T2S
Phase lag of the frequency response of a second order system to a sinusoidal forcing function______________?
A. Is 30°
B. Is 90° at the most
C. Approaches 180° asymptotically
D. Is 120°
Configuration of Bourdon spring tube is never made of _____________ shape?
A. Circular
B. Semi-circular
C. Helical
D. Spiral
Mercury manometer (U-tube type) exemplifies a ______________ order system?
A. Zero
B. First
C. Second
D. Third
Identify an unbounded input from inputs whose transfer functions are given below______________?
A. 1
B. 1/S
C. 1/S2
D. 1/(S2 + 1)
The Laplace transform of exp(at), where a > 0, is defined only for the Laplace parameter, s > a since______________?
A. The function is exponential
B. The Laplace transform of integral of exp(at) has finite values only for s > a
C. The Laplace transform integral of exp(at) has initial values only for s > a
D. The function exp(at) is piece-wise continuous only for s > a
The open loop transfer function of a control system is KR/(1 + TS). This represents ______________?
A. A first order system
B. Dead time system
C. A first order time lag
D. A second order system
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