# Multiple choice question for engineering

## Set 1

1. Resistive transducers are ______________

a) Primary transducers

b) Secondary transducers

c) Either primary or secondary

d) None of the mentioned

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2. What will happen to resistance, if length of conductor is increased?

a) Decreases

b) No change

c) Increases

d) Doubles

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3. Which of the following can be measured using change in resistivity?

a) Temperature

b) Visible radiation

c) Moisture content

d) All of the mentioned

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4. What will happen for resistivity metal and semiconductor if temperature is increased?

a) Increases

b) Decreases

c) For metal increases and for semiconductor decreases

d) For metal decreases and for semiconductor increases

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5. What is the relation of temperature coefficient of resistivity on coefficient of thermal expansion in RTD?

a) Higher

b) Lower

c) Equal

d) None of the mentioned

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6. A metal with temperature coefficient of resistance has a value 200, its initial resistance is given by 40Ω. For an increase in 30^{0}c to35^{0}c what will be the final resistance value?

a) 40 KΩ

b) 4 KΩ

c) 40 Ω

d) 400 Ω

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_{T}=R

_{0}(1+αΔT), where α represents temperature coefficient of resistance, R

_{0}and R

_{T}represents initial and final resistance values.

7. Which of the following can be used to measure using thermistors?

a) Very low

b) In-between 100Ω and 1MΩ

c) Greater than 1MΩ

d) None of the mentioned

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^{0}c can be used to measure resistance values in between 100Ω and 1MΩ.

8. Thermistors may be in wire form.

a) True

b) False

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9. Which of the following is correct for thermistors?

a) Positive temperature coefficient of resistance

b) Negative temperature coefficient of resistance

c) Unpredictable temperature coefficient

d) None of the mentioned

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10. Thermistors have high stability.

a) True

b) False

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## Set 2

1. Seismic transducers are used to measure______________

a) Displacement

b) Velocity

c) Acceleration

d) All of the mentioned

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2. Seismic mass has freedom to move any direction.

a) True

b) False

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3. Relative displacement between housing frame and seismic mass in seismic transducer will be ____________

a) X_{i}(t)-X_{m}(t)

b) X_{i}(t)+X_{m}(t)

c) 2X_{i}(t)

d) 2X_{m}(t)

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4. Which of the following represents application of spring?

a) To provide stability

b) To provide oscillatory motion

c) To provide restoring force

d) None of the mentioned

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5. Damper system is used to ______________

a) Produce oscillations

b) Limit oscillations

c) To produce displacement

d) For indication

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6. Which of the following represents correct relation for undamped natural frequency of system?

a) KM

b) (KM)^{1/2}

c) K/M

d) (K/M)^{1/2}

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7. Seismic transducer is only applicable for displacement measurement.

a) True

b) False

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8. Which of the following spring-mass arrangement is used for displacement measurement?

a) Soft spring small mass

b) Soft spring large mass

c) Stiff spring small mass

d) Stiff spring large mass

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9. How bandwidth can be increased?

a) Lowering natural frequency

b) Increasing natural frequency

c) Doubling natural frequency

d) Bandwidth cannot be increased

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10. Seismic displacement transducers are not suitable for measuring ______________

a) Vibrating velocities

b) Static velocities

c) Dynamic velocities

d) None of the mentioned

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## Set 3

1. Which of the following represents Laplace transform of ramp signal?

a) ^{1}⁄_{S3}

b) ^{1}⁄_{S2}

c) ^{1}⁄_{S}

d) 1

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^{1}⁄

_{S2}. Laplace transform can be found by: ∫

_{0}

^{∞}r(t)e

^{-st}dt.

2.

What does this function represents?

a) u (t)

b) u (t-2)

c) u (t+2)

d) u (-t)

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3. Laplace transform function f (t) is F(S), then how will you represent Laplace transform for differential of f (t)?

a) ^{S}⁄_{F(S)}

b) F(S)

c) S.F(S)

d) F’(S)

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4. How will you obtain given function from unit step signals?

f (t) = 1 for -1≤t≤1

0 otherwise

a) u (t) – u (t+2)

b) u (t+1) – u (t-1)

c) u (t+1) + u(t-1)

d) 2.u (t)

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5. How will you represent given function?

a) u (t)

b) e^{at}.u(t)

c) e^{-at}.u(t)

d) e^{at}.r(t)

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6. Which of the following function is represented using given condition?

f (t) = 1 for t=0

0 otherwise

a) Step function

b) Sine function

c) Ramp function

d) Impulse function

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7. What is the result of the expression f(t)= u (t+2) – u (t-3)?

a) f (t) =1 for -2 ≤ t ≤ 3

b) f (t) =1 for 2 ≤ t ≤ 3

c) f (t) =1 for -2 ≤ t ≤ -1

d) f (t) =1 for -2 ≤ t ≤ 0

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8. Transfer function of a system is given by 1/S. If system has a step input, what will be the output in time domain?(Function exist only for positive time value)

a) Step signal

b) Impulse signal

c) Sinusoidal signal

d) Ramp signal

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^{2}. For a positive sided signal using inverse Laplace transform, output is obtained as ramp signal.

9. Function f (t) has Laplace transform F(S). How will you represent Laplace transform of integral of f(t)?

a) S.F(S)

b) F(S)

c) F(S^{2})

d) ^{F(S)}⁄_{S}

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10. Which of the following represents Laplace transform of sinh(at)?

a) ^{a}⁄_{(S2+a2)}

b) ^{a}⁄_{(S2-a2)}

c) ^{S}⁄_{(S2+a2)}

d) ^{S}⁄_{(S2-a2)}

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^{(ex-e-x)}⁄

_{2}. Applying Laplace transform equation to this expression, we obtain Laplace transform of hyperbolic sine function.

## Set 4

1. Which of the given statement is true for zero-order system?

a) Varying transfer function with time

b) Constant transfer function

c) Transfer function= 1/S

d) Transfer function= 1/s^{2}

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2. Which of the given factor determines order of a system?

a) Maximum power of ‘S’ in characteristic equation

b) Minimum power of ‘S’ in characteristic equation

c) Value of constant value

d) None of the mentioned

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3. Transfer function of a system is given by G(S) =b_{0} ⁄ a_{1}S+a_{0} . What will be the static sensitivity of system?

a) b_{0} ⁄ a_{0}

b) b_{0} ⁄ a_{1}

c) a_{0} ⁄ b_{0}

d) a_{1} ⁄ b_{0}

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_{0}and a

_{0}.

4. What will be the time constant for a system represented by transfer function G(S) =5/(3S+2)?

a) 3

b) 2.5

c) 1.5

d) 2

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5. What will be the damping ratio of a system with transfer function G(S) =5/(3S^{2}+2S+3) ?

a) 1.5

b) 0.5

c) 0.33

d) 2

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_{0}⁄ (a

_{2}S

^{2}+a

_{1}S+a

_{0}) , can be found using equation a

_{1}⁄ (2√ a

_{0}a

_{2}) . Damping ratio of given system will obtain as 0.333 .

6. Which of the following represent condition for an over-damped system?

a) Damping ratio<0

b) Damping ratio=0

c) Damping ratio=0.5

d) Damping ratio>1

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7. Which of the following represents a system with transfer function G(S) =5/(3S^{2}+8S+3) ?

a) Over damped system

b) Un-damped system

c) Under damped system

d) None of the mentioned

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_{1}/(2√a

_{0}a

_{2}) which is equal to 1.33. For a damping ratio greater than 1, system will be over damped system.

8. For a ramp input in second order system, which of the following represents correct relationship between natural frequency and steady state error?

a) Both are directly proportional

b) Both are inversely proportional

c) Both are equal

d) None of the mentioned

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_{n}, where ωn represents natural frequency.

9. What will be the static sensitivity of a system with transfer function G(S) =4/(5S^{2}+8S+2) ?

a) 0.5

b) 2

c) 4

d) 4/5

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_{0}/(a

_{2}S

^{2}+a

_{1}S+a

_{0}) can be represented as b

_{0}/a

_{0}.

10. Transfer function of a system with input y(t) =t^{2}/2 is given by1/S. What will be the obtained output?

a) 6t^{3}

b) t^{3}/6

c) t^{3}

d) t^{4}

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## Set 5

1. Output of a bimetallic element will be __________________

a) Strain

b) Pressure

c) Displacement

d) Voltage

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2. Which of the following can be used for measuring temperature?

a) Metallic diaphragm

b) Fluid expansion system

c) Capsule

d) Bourdon tube

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3. IPTS stands for ________________

a) International Practical Temperature Scale

b) Indian Primary Temperature Scale

c) International Primary Temperature Scale

d) International Practical Temperature Standard

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4. In liquid in steel bulb thermometer, which liquid can be used for measuring temperature up to 6000^{0}C?

a) Mercury

b) Ether

c) Water

d) None of the mentioned

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^{0}C to 6500

^{0}C.

5. Which of the following is used as indication instrument in liquid expansion system?

a) Bellows

b) Bourdon tube

c) Ammeter

d) Thermometer

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6. Which of the following is true for bimetallic type thermometer?

a) Two metals have same temperature coefficients

b) Two metals have different temperature coefficient

c) One metal is cooled always

d) None of the mentioned

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7. When bimetallic thermometer heated, curling occurs to the side of metal with least temperature coefficients.

a) True

b) False

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8. Analogous quantities of heat flow and temperature in electrical are _____________ and _______________

a) Potential and current

b) Current and potential

c) Power and potential

d) Current and power

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9. Ratio of net amount of heat received and stored in the body for certain time interval is known as _________________

a) Temperature

b) Thermal coefficient

c) Thermal storage capacity

d) None of the mentioned

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10. Heat transfer coefficient of a material with length l is _________

a) K/l

b) l/K

c) 1/K

d) Kl