GATE IN format:mcq PYQs & Answers — Page 21

Questions 201–210 of 360. Imported answers require independent review unless marked reviewed.

Topic practice 360 questionsPage 21 of 36

In an ac main, the rms voltage

, rms current

and power

are measured as:

and

(errors are with respect to readings). The percentage error in calculating the power factor using these readings is

Your answerChoose one option.

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Let

denote the unit step function. The bilateral Laplace transform of the function

is _____.

Your answerChoose one option.

with real part of

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Input-output characteristic of a temperature sensor is exponential for a

Your answerChoose one option.

Thermistor

Thermocouple

Resistive Temperature Device (RTD)

Mercury thermometer

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The signal

Your answerChoose one option.

periodic with period

not periodic

periodic with period

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is the series expansion of

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for

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A single-phase transformer has maximum efficiency of 98%. The core losses are 80 W and the equivalent winding resistance as seen from the primary side is 0.5

. The rated current on the primary side is 25 A. The percentage of the rated input current at which the maximum efficiency occurs is

Your answerChoose one option.

35.7%

50.6%

80.5%

100%

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A slip-ring induction motor is expected to be started by adding extra resistance in the rotor circuit. The benefit that is derived by adding extra resistance in the rotor circuit in comparison to the rotor being shorted is

Your answerChoose one option.

The starting torque would be higher.

The power factor at start will be lower.

The starting current is higher.

The losses at starting would be lower.

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Consider a unity feedback configuration with a plant and a PID controller as shown in the figure.

and

with K being scalar. The closed loop is

Diagram for Instrumentation Engineering question 29

Your answerChoose one option.

only stable for

between -1 and +1

only stable for

stable for all values of

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The output

of the ideal OpAmp used in the circuit shown below is 5 V. Then the value of resistor

in kilo ohm (k

) is

Diagram for Instrumentation Engineering question 30

Your answerChoose one option.

2.5

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A Boolean function F of three variables X, Y, and Z is given as

Which one of the following is true?

Your answerChoose one option.

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