Questions and answers for exam Preparation

MCQs

Total Questions : 1634 | Page 161 of 164 pages

Question 1601. A first order system with unity gain and time constant η is subjected to a sinusoidal input of frequency w = 1/η. The amplitude ratio for this system is______________?

0
0.5
1/√2
0.25

Discuss Question

Answer: Option C. -> 1/√2
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 1602. Ordinary mercury in glass thermometer is used for measuring temperature upto 120°C. However, for measuring higher temperature upto __________ °C, thermometer is made by filling nitrogen under pressure above the mercury, which stops the evaporation of mercury and reduces the chance of broken thread of mercury?

Discuss Question

Answer: Option C. -> 550
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 1603. According to Bode stability criterion, a system is unstable, if the open loop frequency response exhibits an amplitude ratio exceeding unity at frequency for which phase lag is_________________?

0°
45°
90°
180°

Discuss Question

Answer: Option D. -> 180°
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 1604. Mcleod gauge measures the _____________ pressure?

Positive
Sub-atmospheric
Very high
Atmospheric

Discuss Question

Answer: Option B. -> Sub-atmospheric
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 1605. Continuous measurement of moisture content of paper in paper industry is done by measuring the_________________?

Thermal conductivity through the paper
Electrical resistance through the paper
Magnetic susceptibility
None of these

Discuss Question

Answer: Option B. -> Electrical resistance through the paper
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 1606. Liquid column manometers are used for measuring the pressure ______________ kgf/cm2?

> 2 (gage)
< 3 (gage)
< 10 (gage)
< atmospheric

Discuss Question

Answer: Option B. -> < 3 (gage)
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 1607. In a second order under damped system, the_________________?

Time required for the response of first reach its ultimate value is called the response time
Overshoot (which is a measure of how much the response exceeds the ultimate value) increase with the decrease of damping co-efficient
Decay ratio (which is the ratio of the sizes of successive peaks) is equal to the reciprocal of overshoot
None of these

Discuss Question

Answer: Option B. -> Overshoot (which is a measure of how much the response exceeds the ultimate value) increase with the decrease of damping co-efficient
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 1608. Which of the following instruments is not used for measuring sub-zero (

Platinum resistance thermometer
Mercury in glass thermometer
Vapor pressure thermometer
Radiation pyrometer

Discuss Question

Answer: Option D. -> Radiation pyrometer
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 1609. “A control system is unstable, if the open loop frequency response exhibits an amplitude ratio exceeding unity at the crossover frequency.” This is _______________ criterion?