Virtual Labs

Temperature Control System

1. Which of the following statements is a correct statement?

a: PI controller improves steady state response Explanation

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b: PD controller improves transient response Explanation

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c: Both of the above Explanation

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d: None of the above Explanation

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2. What is the relationship between the steady-state error, gain and the tendency of oscillations when the controller is supposed to be under the proportional action?

a: Steady-state error increases with an increase in gain and oscillation tendency Explanation

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b: Steady-state error decreases with the decrease in gain and oscillation tendency Explanation

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c: Steady-state error decreases with an increase in gain and oscillation tendency Explanation

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d: Steady-state error increases with the decrease in gain and oscillation tendency Explanation

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3. Full form of RTD is

a: Resistance Thermistor Detector Explanation

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b: Resistance Temperature Detector Explanation

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c: Round Temperature Detector Explanation

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d: None of the above Explanation

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4. Thermistors are very _____ for narrow range applications and slightly _____ for wide temperature ranges

a: Unstable , Linear Explanation

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b: Nonlinear , Unstable Explanation

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c: Linear , Nonlinear Explanation

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d: Nonlinear , Linear Explanation

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5. What is the value of gain, if the proportional band setting is 156%?

a: 0.87 Explanation

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b: 0.95 Explanation

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c: 0.64 Explanation

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d: 0.39 Explanation

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6. Which one of the following controllers increases the order of the system by one?

a: P controller Explanation

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b: PI controller Explanation

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c: None of the above Explanation

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d: Both of the above Explanation

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7. What is the disadvantage of proportional controller?

a: Provides a constant steady state error Explanation

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b: Improves stability of the system Explanation

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c: Improves steady state error Explanation

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d: None of the above Explanation

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8. The _____is a device that changes its electrical resistance with temperature?

a: Thermopile Explanation

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b: Thermostat Explanation

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c: Thermistor Explanation

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d: None of the above Explanation

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9. Automatic controllers operate on the difference between set point and measurement, which is called

a: Error Explanation

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b: Bias Explanation

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c: Feedback Explanation

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d: Offset Explanation

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10. A plant is controlled by a proportional controller. If a time delay element is introduced in the loop then ______

a: Gain margin remains the same Explanation

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b: Phase margin remains the same Explanation

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c: Gain margin decreases Explanation

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d: Phase margin decreases Explanation

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