Control Systems MCQ Questions & Answers

41

DC tachogenerator can be used in

A) Speed control system B) Position control system C) Both A and B D) Neither A nor B

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Answer & Solution

Answer: Option C

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42

A conditionally stable system is stable for the value of gain between two critical values. It is unstable if

A) The gain is increased beyond upper critical value B) The gain is decreased below lower critical value C) Both A and B D) None of the above

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Answer & Solution

Answer: Option C

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43

Which dc servomotor requires strongest permanent magnet?

A) Slotted armature B) Surface wound armature C) Surface wound with stationary rotor D) Either A or B

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Answer & Solution

Answer: Option C

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44

Which of the following is used to obtain output position in a position control system?

A) Strain gauge B) Load cell C) Synchro D) Thermistor

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Answer & Solution

Answer: Option B

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45

Temperature is analogous to

A) Voltage B) Flux C) Charge D) None of the above

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Answer & Solution

Answer: Option A

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46

If any term in the first column of a Routh array becomes zero, then

A) Routh criterion cannot be used to determine stability B) Routh criterion can be used by substituting a small positive number for zero and completing the array C) Routh criterion can be used by substituting a big positive number for zero and completing the array D) Routh criterion can be used by substituting a small negative number for zero and complet-ing the array

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Answer & Solution

Answer: Option B

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47

The charge q in the electrical system is analogous to which thermal system quantity?

A) Heat flow B) Temperature C) Resistance D) Capacitance

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Answer & Solution

Answer: Option A

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48

For open loop transfer function of a unit feedback is $$G\left( s \right) = \frac{1}{{s\left( {s + 2} \right)}},$$ having peak overshoot 10%. Find damping ratio.

A) 0.36 B) 0.60 C) 0.72 D) 0.10

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Answer & Solution

Answer: Option B

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49

Match List-I with List-II and select the correct answer, using the options given below:

List-I	List-II
a. Synchro	1. Amplifier
b. Amplidyne	2. Actuator
c. Servo motor	3. Compensator
d. RC network	4. Transducer

A) a-1, b-2, c-3, d-4 B) a-4, b-3, c-2, d-1 C) a-3, b-2, c-4, d-1 D) a-4, b-1, c-2, d-3

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Answer & Solution

Answer: Option D

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50

The characteristic equation of a control system is given as s⁴ + 4s³ + 4s² + 3s + K = 0
What is the value of K for which this system is marginally stable?

A) $$\frac{9}{{16}}$$ B) $$\frac{{19}}{{16}}$$ C) $$\frac{{29}}{{16}}$$ D) $$\frac{{39}}{{16}}$$

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Answer & Solution

Answer: Option D

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Control Systems MCQ Questions & Answers | ECE