McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Electrical Engineering .
| 151. |
System transformation on function H(z) for a discrete time LTI system expressed in state variable form with zero initial condition |
| A. | -1b+d |
| B. | c(zi-a)-1 |
| C. | (zi-a)-1z |
| D. | (zi-a)-1 |
| Answer» A. -1b+d | |
| Explanation: transfer function which is ratio of laplace output to the laplace input when the initial conditions are zero in discrete is same as continuous but in the z-domain. | |
| 152. |
State space analysis is applicable for non- linear systems and for multiple input and output systems. |
| A. | true |
| B. | false |
| Answer» A. true | |
| Explanation: state space analysis is the technique that used state variables and state model for the analysis and is applicable for non-linear systems and for multiple input and output systems. | |
| 153. |
When human being tries to approach an object, his brain acts as, |
| A. | an error measuring device |
| B. | a controller |
| C. | an actuator |
| D. | an amplifier |
| Answer» B. a controller | |
| Explanation: brain of human being acts as a controller in the human body system as human body is the control system and when | |
| 154. |
For two-phase AC servomotor, if the rotor’s resistance and reactance are respectively R and X, its length and diameter are respectively L and D then, |
| A. | x/r and l/d are both small |
| B. | x/r is large but l/d is small |
| C. | x/r is small but l/d is large |
| D. | x/r and l/d are both large |
| Answer» C. x/r is small but l/d is large | |
| Explanation: small x/r gives linear speed torque characteristic. large l/d gives less inertia and good acceleration characteristic. | |
| 155. |
Error detector: |
| A. | armature controlled fhp dc motor |
| B. | a pair of synchronous transmitter and control transformer |
| C. | tach generator |
| D. | amplidyne |
| Answer» A. armature controlled fhp dc motor | |
| Explanation: error detector is the part in the armature controlled fhp dc motor where | |
| 156. |
Servomotor: |
| A. | armature controlled fhp dc motor |
| B. | a pair of synchronous transmitter and control transformer |
| C. | tach generator |
| D. | amplidyne |
| Answer» B. a pair of synchronous transmitter and control transformer | |
| Explanation: servomotor is a rotary actuator or linear actuator that allows for precise control of angular or linear position, velocity and acceleration a pair of synchronous transmitter and control transformer. | |
| 157. |
Amplifier: |
| A. | armature controlled fhp dc motor |
| B. | a pair of synchronous transmitter and control transformer |
| C. | tach generator |
| D. | amplidyne |
| Answer» D. amplidyne | |
| Explanation: amplifier is an amplidyne which is an amplidyne is an electromechanical amplifier invented during world war ii by ernst alexanderson. it consists of an electric motor driving a dc generator. | |
| 158. |
A differentiator is usually not a part of a control system because it |
| A. | reduces damping |
| B. | reduces the gain margin |
| C. | increases input noise |
| D. | increases error |
| Answer» C. increases input noise | |
| Explanation: a differentiator is the phase lead compensator which increases the speed of response and bandwidth and manages the transient response of the system. | |
| 159. |
If the gain of the critical damped system is increased it will behave as |
| A. | oscillatory |
| B. | critically damped |
| C. | overdamped |
| D. | underdamped |
| Answer» D. underdamped | |
| Explanation: gain of the critical system is inversely proportional to the root of the damping factor and hence on increasing the gain the damping reduces and system becomes the underdamped. | |
| 160. |
In a control system integral error compensation steady state error |
| A. | increases |
| B. | minimizes |
| C. | does not have any effect on |
| D. | all of the mentioned |
| Answer» B. minimizes | |
| Explanation: integral error compensation is the phase lag compensation and reduces the steady state error and eliminates the error. | |
| 161. |
With feedback reduces. |
| A. | system stability |
| B. | system gain |
| C. | system stability and gain |
| D. | none of the mentioned |
| Answer» B. system gain | |
| Explanation: feedback reduces the gain as it causes the stability to the closed loop system and for the good control system the stability of the system should be high and also the speed of response. | |
| 162. |
An amplidyne can give which of the following characteristics? |
| A. | constant current |
| B. | constant voltage |
| C. | constant current as well as constant voltage |
| D. | constant current, constant voltage and constant power |
| Answer» D. constant current, constant voltage and constant power | |
| Explanation: an amplidyne has constant current, voltage and power. | |
| 163. |
Which of the following can be measured by LVDT? |
| A. | displacement |
| B. | velocity |
| C. | acceleration |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: lvdt can measure displacement, velocity and acceleration which is a linear variable differential transformer and inductive transducer. | |
| 164. |
directly converts temperature into voltage. |
| A. | thermocouple |
| B. | potentiometer |
| C. | gear train |
| D. | lvdt |
| Answer» A. thermocouple | |
| Explanation: thermocouple is a device that converts the change in the temperature into voltage in which the change in temperature of | |
| 165. |
The transfer function technique is considered as inadequate under which of the following conditions? |
| A. | systems having complexities and non- linearity’s |
| B. | systems having stability problems |
| C. | systems having multiple input disturbances |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: transfer function is the ratio of laplace output to the laplace input with the zero initial conditions and is considered inadequate due to complexity, stability problems and multiple input disturbances. | |
| 166. |
Which of the following is the output of a thermocouple? |
| A. | alternating current |
| B. | direct current |
| C. | a.c. voltage |
| D. | d.c. voltage |
| Answer» D. d.c. voltage | |
| Explanation: thermocouple is the device that is used to convert the change in temperature gives output in dc form. | |
| 167. |
A system is said to be if it is possible to transfer the system state from any initial state to any desired state in finite interval of time. |
| A. | controllable |
| B. | observable |
| C. | cannot be determined |
| D. | controllable and observable |
| Answer» A. controllable | |
| Explanation: by definition a system is said to be controllable, if it is possible to transfer | |
| 168. |
A system is said to be if every state can be completely identified by measurements of the outputs at the finite time interval. |
| A. | controllable |
| B. | observable |
| C. | cannot be determined |
| D. | controllable and observable |
| Answer» B. observable | |
| Explanation: by definition, a system is said to be observable, if every state can be completely identified by measurements of the outputs at the finite time interval. | |
| 169. |
Kalman’s test is for : |
| A. | observability |
| B. | controllability |
| C. | optimality |
| D. | observability and controllability |
| Answer» D. observability and controllability | |
| Explanation: kalman’s test is the test that is done for the controllability and observability by solving the matrix by kalman’s matrix individually for both tests. | |
| 170. |
Consider a system if represented by state space equation and x1 (t) =x2 (t), then the system is: |
| A. | controllable |
| B. | uncontrollable |
| C. | observable |
| D. | unstable |
| Answer» B. uncontrollable | |
| Explanation: after calculating the matrix which for controllable system and finding the determinant and should not be zero but in this case comes to be zero. | |
| 171. |
A transfer function of the system does not have pole-zero cancellation? Which of the following statements is true? |
| A. | system is neither controllable nor observable |
| B. | system is completely controllable and observable |
| C. | system is observable but uncontrollable |
| D. | system is controllable and unobservable |
| Answer» B. system is completely controllable and observable | |
| Explanation: if the transfer function of the system does not have pole-zero cancellation then it is completely controllable and observable. | |
| 172. |
Complex conjugate pair: |
| A. | center |
| B. | focus point |
| C. | saddle point |
| D. | stable node |
| Answer» B. focus point | |
| Explanation: complex conjugate pair is the complex pair of the roots of the equation and has a focus point. | |
| 173. |
Pure imaginary pair: |
| A. | centre |
| B. | focus point |
| C. | saddle point |
| D. | stable node |
| Answer» A. centre | |
| Explanation: pure imaginary pair is the nature of the root of the equation that has no real part only has the nature of center for linearized autonomous second order system. | |
| 174. |
Real and equal but with opposite sign. |
| A. | center |
| B. | focus point |
| C. | saddle point |
| D. | stable node |
| Answer» C. saddle point | |
| Explanation: saddle point are real and equal with opposite sign and these points are called the saddle point as the points are different with real and equal with opposite sign. | |
| 175. |
Real distinct and negative. |
| A. | center |
| B. | focus point |
| C. | saddle point |
| D. | stable node |
| Answer» D. stable node | |
| Explanation: stable node is real distinct and negative and this node is stable as the points or roots are real and neative lying on the left side of the plane. | |
| 176. |
Stability of a system implies that : |
| A. | small changes in the system input does not result in large change in system output |
| B. | small changes in the system parameters does not result in large change in system output |
| C. | small changes in the initial conditions does not result in large change in system output |
| D. | all of the above mentioned |
| Answer» D. all of the above mentioned | |
| Explanation: stability of the system implies that small changes in the system input, initial conditions, and system parameters does not result in large change in system output. | |
| 177. |
If the roots of the have negative real parts then the response is |
| A. | stable |
| B. | unstable |
| C. | marginally stable |
| D. | bounded |
| Answer» D. bounded | |
| Explanation: if the roots of the have negative real parts then the response is bounded and eventually decreases to zero. | |
| 178. |
Which among the following is a unique model of a system? |
| A. | transfer function |
| B. | state variable |
| C. | block diagram |
| D. | signal flow graphs |
| Answer» A. transfer function | |
| Explanation: transfer function is defined as the ratio of the laplace output to the laplace input with the zero initial conditions and is a unique model of the system. | |
| 179. |
According to the property of state transition method, e0 is equal to |
| A. | i |
| B. | a |
| C. | e-at |
| D. | -eat |
| Answer» C. e-at | |
| Explanation: by definition state transition matrix is defined as e-at and this is the matrix that comes into the picture when the total response is considered that is with the free response and forced response. | |
| 180. |
Which mechanism in control engineering implies an ability to measure the state by taking measurements at output? |
| A. | controllability |
| B. | observability |
| C. | differentiability |
| D. | adaptability |
| Answer» B. observability | |
| Explanation: observability and controllability are the two methods to check the output response characteristics and observability in control engineering implies an ability to measure the state by taking measurements at output. | |
| 181. |
State model representation is possible using |
| A. | physical variables |
| B. | phase variables |
| C. | canonical state variables |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: state model representation is the representation of the control system is the form of the state variables and state vectors | |
| 182. |
Which among the following constitute the state model of a system in addition to state equations? |
| A. | input equations |
| B. | output equations |
| C. | state trajectory |
| D. | state vector |
| Answer» B. output equations | |
| Explanation: output equations constitute the state model of a system in addition to state equations and for the complete state model mainly input model, output model and state models are required. | |
| 183. |
Which among the following plays a crucial role in determining the state of dynamic system? |
| A. | state variables |
| B. | state vector |
| C. | state space |
| D. | state scalar |
| Answer» A. state variables | |
| Explanation: state variables are the integral part of the state variable analysis and plays a crucial role in determining the state of dynamic system. | |
| 184. |
Which among the following are the interconnected units of state diagram representation? |
| A. | scalars |
| B. | adders |
| C. | integrator |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| Explanation: scalars, adders and integrator are the interconnected units of state diagram representation and this representation helps in determination of the state of the control system. | |
| 185. |
State space analysis is applicable even if the initial conditions are |
| A. | zero |
| B. | non-zero |
| C. | equal |
| D. | not equal |
| Answer» B. non-zero | |
| Explanation: state space analysis is the analysis different from the transfer function approach as it has state variables and state vectors used for the analysis and can be used even if initial conditions are non-zero. | |
| 186. |
Conventional control theory is applicable to systems |
| A. | siso |
| B. | mimo |
| C. | time varying |
| D. | non-linear |
| Answer» A. siso | |
| Explanation: the major advantage of state space analysis is that it can be applied to mimo systems also while the conventional control theory that is transfer function approach is applicable to the siso systems only. | |
| 187. |
Insertion of negative feedback in control system affects: |
| A. | the transient response to vanish uniformly |
| B. | the transient response to decay very fast |
| C. | no change in transient response |
| D. | the transient response decays at slow rate |
| Answer» B. the transient response to decay very fast | |
| Explanation: feedback can be positive or negative but practically positive feedback is not used as it causes oscillations in the system with more gain and hence negative feedback is use which causes speed of response to increase. | |
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