# Multiple choice question for engineering

## Set 1

1. Why is the scale of a megger calibrated in megaohms?

a) to indicate resistance

b) to minimise the current flow

c) to increase the voltage drop

d) to reduce the temperature

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2. Megger can be used for verifying the electrical insulation level of

a) passive components such as resistance, capacitor and inductance

b) devices such as motor, cable, etc

c) solid state devices

d) liquid crystal devices

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3. Continuity between any two points can be measured using

a) ammeter

b) voltmeter

c) megger

d) galvanometer

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4. Electrical continuity between any two points exists if

a) there is current flow through them

b) there is a wire connecting the points

c) there is sufficient voltage drop

d) pointer shows deflection

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5. Megger is also known as _________

a) megaohmmeter

b) multimeter

c) galvanometer

d) ammeter

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6. The application of a megger is _________

a) to measure resistance

b) to test for leakage

c) to limit the current

d) to increase the emf of the circuit

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7. What is the significance of a megger with respect to high resistance?

a) it is used to limit the current

b) it is used to provide stability

c) used for measuring high resistance with respect to ground

d) it is used for temperature protection

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8. How is the megger calibrated?

a) in steps of 1 unit per division

b) based on the value of resistance to be measured

c) directly calibrated on the position of the pointer

d) reversely calibrated based on the pointer position

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## Set 2

1. Wheatstone bridge is a __________

a) a.c. bridge

b) d.c. bridge

c) high voltage bridge

d) power dissipation bridge

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2. Wheatstone bridge is used to measure resistance in the range of ________

a) 1Ω to a few megaohms

b) 10kΩ to a few megaohms

c) 100MΩ to a few gegaohms

d) 100Ω to a few teraohms

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3. Wheatstone bridge is used to measure the d.c. resistance of various types of wires for

a) determining their effective resistance

b) computing the power dissipation

c) quality control of wire

d) maintaining a source of constant e.m.f

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4. Telephone companies make use of the Wheatstone bridge for _________

a) measuring the telephone resistance

b) computing the line strength

c) maintaining dialtone

d) locating the cable faults

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5. The types of faults in a telephone line are ________

a) line to line or line to ground

b) triple line to line or line to ground

c) open circuit and short circuit

d) symmetrical and unsymmetrical

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6. How can a Wheatstone bridge be used for the measurement of physical parameters?

a) in conjunction with a rectifier

b) along with an op amp

c) by connecting it to a thermistor

d) by making use of a transducer

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7. By using the variations on a Wheatstone bridge we can

a) measure quantities such as voltage, current and power

b) measure high resistance values

c) measure quantities such as complex power

d) measure quantities such as capacitance, inductance and impedance

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8. One of the simplest applications of a Wheatstone bridge is ________

a) voltage measurement

b) current measurement

c) light measurement

d) power measurement

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9. Thermal compensation can be provided in a Wheatstone bridge by ________

a) using more than one resistive sensor

b) making use of a heat sink

c) using cooling fans

d) immersing the circuit into a liquid

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## Set 3

1. What is the significance of the balance equation on losses?

a) independent of losses in inductance

b) independent of losses in capacitance

c) independent of losses in resistance

d) independent of losses in the circuit

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_{x}= R

_{2}R

_{3}C

_{1}

2. Balance equation is dependent on frequency.

a) True

b) False

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3. How can R_{1} be scaled?

a) by using a scale

b) by using an ohmmeter

c) by calibration

d) by using a galvanometer

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_{1}in a Maxwell inductance capacitance bridge can be scaled through calibration. The value of the Quality factor Q can be read directly through calibration.

4. Scale of resistance can be calibrated.

a) True

b) False

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_{1}in a Maxwell inductance capacitance bridge can be calibrated directly. As a result the value of the unknown inductance can be read directly.

5. Bridge can be used for the measurement of _________

a) high Q values

b) intermediate Q values

c) very low Q values

d) low Q values

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6. The balance condition is _________

a) is easy to obtain

b) is difficult to obtain

c) can’t be obtained

d) exists always

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7. Commercial Maxwell bridges measure

a) inductances in the range of 1 to 1000H

b) capacitances in the range of 10mF to 1F

c) resistances in the range of 0.001 Ω to 1Ω

d) power in the range of 1W to 50MF

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8. At high Q values, the angular balance condition

a) is satisfied

b) is not satisfied

c) is independent of Q factor

d) is partially affected

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_{1}+ θ

_{4}= θ

_{2}+ θ

_{3}is not satisfied at high Q factor values. This occurs as θ

_{4}reaches 90°. θ

_{1}must become –90° as per the angular balance condition. But for this the value of R

_{1}should be very high, which is not practically feasible.

## Set 4

1. In a capacitance bridge, the arms are _________

a) resistive

b) capacitive

c) inductive

d) mixture of resistance, capacitance and inductance

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2. How is the bridge balanced?

a) using resistance R_{1}

b) using resistance R_{3}

c) through capacitance C_{3}

d) through capacitance C_{x}

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_{3}. At balance we get the value of the unknown resistance as R

_{x}=

^{R1 R3}⁄

_{R2}.

3. Impedance Z_{4} consists of _________

a) resistance R_{x}

b) capacitance C_{x}

c) combination of capacitance Cx and resistance Rx

d) consists of a detector

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_{4}consists of the unknown impedance. Impedance Z

_{4}consists of capacitance C

_{x}in series with a leakage resistance R

_{x}.

4. Impedance Z_{3} consists of_________

a) resistance R_{3}

b) capacitance C_{3}

c) vibration galvanometer

d) capacitance C_{3} in series with resistance R_{3}

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_{3}comprises capacitance C

_{3}in series with resistance R

_{3}.

5. Unknown capacitance value is obtained by _________

a) comparison with standard

b) using a tuned detector

c) using capacitance of other ratio arms

d) using a vibration galvanometer

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6. Unknown resistance is obtained by using the relation

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_{x}=

^{R2 R3}⁄

_{R1}at balance condition.

7. Unknown capacitance is found by using the relation

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_{x}=

^{C3 R1}⁄

_{R2}at balance condition.

8. Actual balance condition can be obtained by _________

a) varying R_{1}

b) varying R_{3}

c) varying R_{2}

d) varying R_{1} and R_{3}

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_{1}and R

_{3}are variable, while resistance R

_{2}is fixed. By varying the resistances R

_{1}and R

_{3}, we get the actual balance condition.

## Set 5

1. Potential transformers are used to measure _________

a) high voltages

b) low voltages

c) high currents

d) low currents

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2. Potential transformers are used with _________

a) high range voltmeter

b) low range voltmeter

c) intermediate range voltmeter

d) very high range voltmeter

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3. Potential transformer is similar in design to a

a) C.T.

b) Step up transformer

c) Power transformer

d) Step down transformer

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4. The secondary winding of a P.T. is designed for

a) 220 V

b) 2.2 kV

c) 1.1 kV

d) 110 V

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5. The primary current in a C.T. is _________

a) independent of secondary circuit

b) dependent on the secondary circuit

c) depends on the transformation ratio

d) depends on the nominal ratio

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6. The excitation current of a C.T.

a) varies over a fixed range of operation

b) varies over a wide range of normal operation

c) is fixed over a range of operation

d) is fixed always

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7. Secondary of a P.T. can be open circuited.

a) True

b) False

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8. When C.T. is connected in series with a line, a large voltage exists across the primary.

a) True

b) False