# Multiple choice question for engineering

## Set 1

1. Bridge balance equation for magnitude is given by the relation

a) Z_{1} Z_{4} = Z_{2} Z_{3}

b) Z_{1} Z_{2} = Z_{3} Z_{4}

c) Z_{2} Z_{4} = Z_{1} Z_{3}

d) Z_{1} Z_{3} = Z_{2} Z_{4}

### View Answer

_{1}Z

_{4}= Z

_{2}Z

_{3}where, Z

_{1}, Z

_{2}, Z

_{3}and Z

_{4}are the impedance arms of the AC bridge circuit.

2. Angular balance equation is given by the relation

a) θ_{1} × θ_{4} =θ_{2} × θ_{3}

b) θ_{1} + θ_{4} =θ_{2} + θ_{3}

c) θ_{2} + θ_{4} =θ_{1} + θ_{3}

d) θ_{2} × θ_{4} =θ_{1} × θ_{3}

### View Answer

_{1}+ θ

_{4}= θ

_{2}+ θ

_{3}Where, θ

_{1}, θ

_{2}, θ

_{3}and θ

_{4}are the phase angles of the impedances Z

_{1}, Z

_{2}, Z

_{3}and Z

_{4}.

3. Bridge must be balanced for ________

a) magnitude

b) angle

c) magnitude and angle

d) power

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4. Phase angle is based on _______

a) source

b) detector

c) power

d) impedance

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5. For inductive impedances, the phase angle is _______

a) positive

b) negative

c) zero

d) exponential

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6. For capacitive impedances, the phase angle is _______

a) tangential

b) negative

c) positive

d) logarithmic

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7. Bridge balance equation for magnitude in terms of admittances is given by the relation.

a) Y_{1}Y_{3} = Y_{2}Y_{4}

b) Y_{1}Y_{2} = Y_{3}Y_{4}

c)Y_{1}Y_{4} = Y_{2}Y_{3}

d) Y_{1} Y_{3} = Y_{2} Y_{4}

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8. When bridge is balanced?

a) no voltage drop across the circuit

b) power dissipation is high

c) temperature of the circuit is high

d) no current flows

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## Set 2

1. Capacitance of a parallel plate capacitor is ________

a) C = ^{A∈}⁄_{d}

b) C = ^{∈}⁄_{d}

c) C = ^{A}⁄_{d}

d) C = A

### View Answer

^{A∈}⁄

_{d}where, A is the area of cross section of the plates d is the distance of separation between the plates ∈ is the permittivity of space.

2. A capacitive transducer works on the principle of ________

a) inductance

b) capacitance

c) resistance

d) reluctance

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3. Capacitance of a cylindrical capacitor is given by ________

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4. Capacitance can be varied in ________

a) 10 ways

b) 6 ways

c) 2 ways

d) 4 ways

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5. Capacitive pressure transducer uses distance of separation for sensing the capacitance.

a) True

b) False

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6. Capacitive transducer displays ________

a) linear behaviour

b) non-linear behaviour

c) exponential behaviour

d) tangential behaviour

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7. Frequency response of capacitive transducers is ________

a) high

b) medium

c) low

d) zero

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8. What is the relation between capacitance and output impedance?

a) proportional to square

b) constant

c) directly proportional

d) inversely proportional

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9. What is the relation between capacitance and input impedance?

a) directly proportional

b) constant

c) proportional to square

d) inversely proportional

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10. Composite capacitance consists of _________

a) one dielectric medium

b) more than one dielectric medium

c) five dielectric media

d) ten dielectric media

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_{1}, d

_{2}and d

_{3}are the thicknesses ∈

_{1}, ∈

_{2}and ∈

_{3}are the permittivities of the three different media.

## Set 3

1. Electron gun section ________

a) provides sharp beam

b) provides poorly focussed beam

c) doesn’t provide any beam

d) provides electrons only

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2. Control grid is given ________

a) positive voltage

b) negative voltage

c) neutral voltage

d) zero voltage

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3. What determines light intensity in a CRT?

a) voltage

b) current

c) momentum of electrons

d) fluorescent screen

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4. Effect of negative voltage to the grid is ________

a) no force

b) a gravitational force

c) an attractive force

d) a repulsive force

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5. Electron beam diverges.

a) True

b) False

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6. Focusing and accelerating anodes are ________

a) rectangular

b) cylindrical

c) spherical

d) square

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7. Deflection system of a CRT consists of ________

a) 4 plates

b) 6 plates

c) 2 plates

d) 8 plates

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8. Horizontal deflection is given by ________

a) x = K_{x}

b) x = V_{x}

c) x = 1

d) x = K_{x} V_{x}

### View Answer

_{x}V

_{x}where, K

_{x}is the constant of proportionality x is the horizontal deflection V

_{x}is the horizontal deflecting voltage.

9. Vertical deflection is given by ________

a) y = K_{y} V_{y}

b) y = K_{y}

c) x = 1

d) y = V_{y}

### View Answer

_{y}V

_{y}where, K

_{y}is the constant of proportionality y is the vertical deflection V

_{y}is the vertical deflecting voltage.

## Set 4

1. Accuracy is defined as the closeness that a reading approaches with respect to a standard value.

a) True

b) False

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2. The output of a transducer must ___________

a) be different at different environment conditions

b) be same at all environment conditions

c) be same at some environment conditions

d) be zero always

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3. The output of a transducer must be __________

a) low

b) medium

c) high

d) zero

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4. The size of a transducer must be __________

a) infinite

b) zero

c) large

d) small

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5. A transducer must be __________

a) quick in response

b) slow in response

c) medium in response

d) very slow in response

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6. The output of a transducer must __________

a) be less reliable

b) be highly reliable

c) not be reliable

d) be of medium reliability

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7. The range of a transducer is __________

a) medium

b) narrow

c) large

d) zero

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8. The transducer output is __________

a) exponential

b) unit step

c) non-linear

d) linear

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9. The sensitivity of an electrical transducer is obtained by dividing the electrical output with respect to unit change in the physical quantity.

a) True

b) False

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## Set 5

1. Increasing secondary burden

a) increases I_{s}

b) decreases I_{s}

c) keeps I_{s} constant

d) decreases I_{p}

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2. For a given V_{p} the V_{s}

a) increases

b) decreases

c) remains constant

d) depends on the supply

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_{p}, the value of the secondary voltage V

_{s}decreases. This leads to a decrease in the actual ratio.

3. What is effect of the secondary burden on the ratio error?

a) ratio error is constant with secondary burden

b) ratio error decreases with secondary burden

c) ratio error increases with secondary burden

d) depends on the supply voltage

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4. V_{p} is leading in phase, while V_{s} is lagging in phase.

a) True

b) False

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_{p}is leading in phase while V

_{s}is lagging in phase. As a result the phase angle increases with the secondary burden.

5. What is the effect of p.f. on secondary burden?

a) I_{p} shifts towards I_{o}

b) I_{p} deviates from I_{o}

c) I_{p} is independent of I_{o}

d) I_{p} and I_{o} cancel eachother

### View Answer

_{p}shifts towards I

_{o}. Voltages V

_{p}and V

_{s}come closer to E

_{p}and E

_{s}.

6. How is the transformation ratio dependent on the secondary burden?

a) decreases

b) increases

c) remains constant

d) depends on the supply

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_{p}is constant, the induced primary e.m.f E

_{p}is reduced. Similarly the secondary voltage V

_{s}is reduced with respect to E

_{s}. As a result the transformation ratio increases.

7. Decrease in p.f. makes V_{s} to lead V_{p}.

a) True

b) False

### View Answer

_{p}decreases in phase. Thus the phase angle reduces with the decrease in power factor (lagging).

8. At constant voltage how is frequency affected by flux?

a) decreases with increase in flux

b) increases with decrease in flux

c) remains constant

d) depends on the current