### questions

Title
###### A control system working under unknown random action is called

A control system working under unknown random action is called

1. computer control system
2. digital data system
3. stochastic control system
###### The first order control system, which is is well designed, has a

The first order control system, which is is well designed, has a

1. small bandwidth
2. negative time constant
3. large negative transfer function pole
4. none of the above
###### Zero-order hold used in practical reconstruction of continuous-time signals is mathematically represented as a weighted-sum of rectangular pulsesshifted by:

Zero-order hold used in practical reconstruction of continuous-time signals is mathematically represented as a weighted-sum of rectangular pulsesshifted by:

1. any multiples of the sampling interval
2. integer multiples of the sampling interval
3. one sampling interval
4. 1 second intervals
###### Sampling can be done by:

Sampling can be done by:

1. impulse train sampling
2. natural sampling
3. flat-top sampling
4. all of the mentioned
###### The first step required to convert analog signal to digital is :

The first step required to convert analog signal to digital is :

1. sampling
2. holding
3. reconstruction
4. quantization
###### Sampling is necessary :

Sampling is necessary :

1. in complex control systems
2. where high accuracy is required
3. non automated control systems
4. automated control system
###### _______________ is a sampling pattern which is repeated periodically

_______________ is a sampling pattern which is repeated periodically

1. single order sampling
2. multi order sampling
3. zero order sampling
4. unordered sampling
###### Aliasing is caused when:

Aliasing is caused when:

1. sampling frequency must be equal to the message signal
2. sampling frequency must be greater to the message signal
3. sampling frequency must be less to the message signal
4. sampling frequency must be greater than or equal to the message signal
###### The signal is reconstructed back with the help of

The signal is reconstructed back with the help of

1. zero order hold circuits
2. extrapolations
3. signal is reconstructed with zero order holds and extrapolations
4. signal is not reconstructed
###### A control system working under unknown random actions is called ---

A control system working under unknown random actions is called ---

1. computer control system
2. digital data system
3. stochastic control system
###### Zero initial condition for a system means

Zero initial condition for a system means

1. input reference signal is zero
2. zero stored energy
3. no initial movement of moving parts
4. system is at rest and no energy is stored in any of its components
###### The first order control system ,which is well designed has a

The first order control system ,which is well designed has a

1. small bandwidth
2. negative time constant
3. large negative transfer function pole
4. none of the above
###### A zero order hold is used with sampled data system to

A zero order hold is used with sampled data system to

1. make it critically damped
2. reconstruct the sampled signal
3. improve the stability of the system
4. convert it to a continuous system
###### A controller is basically a ---

A controller is basically a ---

1. sensor
2. comparator
3. amplifier
4. clipper
###### Z and Laplace transform are related by:

Z and Laplace transform are related by:

1. s = ln z
2. s =ln z/t
3. s =z
4. s= t/ln z
###### What is the z-transform of the signal x[n] = anu(n)?

What is the z-transform of the signal x[n] = anu(n)?

1. x(z) =1/z-1
2. x(z) = 1/1-z
3. x(z) = z/z-a
4. x(z) = 1/z-a
###### Which one of the following rules determine the mapping of s-plane to z-plane?

Which one of the following rules determine the mapping of s-plane to z-plane?

1. right side of the s-plane maps into outside of the unit circle in z-plane
2. left half of s-plane maps into inside of the unit circle
3. imaginary axis in s-plane maps into the circumference of the unit circle
4. all of the mentioned
###### Assertion (A): The z-transform of the output of the sampler is given by the series.Reason (R): The relationship is the result of the application of z = e-sT, where T stands for the time gap between the samples

Assertion (A): The z-transform of the output of the sampler is given by the series.Reason (R): The relationship is the result of the application of z = e-sT, where T stands for the time gap between the samples.

1. both a and r are true and r is correct explanation of a
2. both a and r are true but r is not correct explanation of a
3. a is true but r is false
4. a is false but r is true
###### Inverse z-transform of the system can be calculated using:

Inverse z-transform of the system can be calculated using:

1. partial fraction method
2. long division method
3. basic formula of the z-transform
4. all of the mentioned
###### If the z transform of x(n) is X(z) =z(8z-7)/4z2-7z+3, then the final value theorem is :

If the z transform of x(n) is X(z) =z(8z-7)/4z2-7z+3, then the final value theorem is :

1. 1
2. 2

MCQs

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