R4RIN – MCQs, Mock Tests | Electrical measurements Electrical Measurement MCQ Question Set 7

An electronic energy meter makes use of ______

1. IC
2. Transformer
3. CRO
4. Multimeter

✅ Correct Answer: 1

Measurement of energy involves _____

1. inductance and capacitance measurement
2. power consumption and time duration
3. resistance measurement and voltage drop
4. current consumption and voltage drop

✅ Correct Answer: 2

Average power is _______

1. product of voltage and current
2. product of average current and voltage
3. product of instantaneous voltage and current
4. product of absolute voltage and current

✅ Correct Answer: 3

What is the role of a multiplier?

1. it multiplies the voltage and current
2. divides the alternating voltage and current
3. supplies instantaneous voltage and current
4. multiplies alternating voltage and current

✅ Correct Answer: 4

Frequency of oscillation in an electronic energy meter depends on ______

1. output current of multiplier
2. output voltage of multiplier
3. output power of multiplier
4. input resistance of multiplier

✅ Correct Answer: 1

Analog signal is converted _______

1. into oscillations
2. into digital
3. into pulses
4. into current

✅ Correct Answer: 2

An electronic energy meter is advantageous compared to conventional ones.

1. True
2. False
3. all of the above
4. None of the mentioned

✅ Correct Answer: 1

Energy meter can be directly used in measurement.

1. True
2. False
3. all of the above
4. None of the mentioned

✅ Correct Answer: 2

Creeping in an energy meter can be found using ______

1. creep adjustment
2. preliminary light load adjustment
3. full load u.p.f adjustment
4. light load adjustment

✅ Correct Answer: 2

Preliminary light load adjustment involves _______

1. applying rated voltage across current coil
2. making use of a light load
3. applying rated voltage across pressure coil
4. adjusting the light load

✅ Correct Answer: 3

Creep adjustment involves _____

1. adjusting the creep
2. exciting the current coil
3. adjusting the turns ratio
4. exciting the pressure coil

✅ Correct Answer: 4

Light load adjustment involves ________

1. applying rated voltage across the pressure coil
2. adjusting a light load
3. applying rated current across the transformer
4. applying rated voltage across the current coil

✅ Correct Answer: 1

Low power factor adjustment involves _____

1. adjusting the power factor at lower loads
2. applying rated voltage to pressure coil and a p.f. of 0.5 for current coil
3. only applying rated voltage to pressure coil
4. only a p.f. of 0.5 for the current coil

✅ Correct Answer: 2

Full load u.p.f adjustment involves ______

1. adjusting the loads at unity power factor
2. applying rated voltage to pressure coil and a p.f. of unity for current coil
3. only applying rated voltage to pressure coil
4. only a p.f. of unity for the current coil

✅ Correct Answer: 3

Phase sequence indicator gives the maximum value of phase voltages.

1. True
2. False
3. all of the above
4. None of the mentioned

✅ Correct Answer: 1

Synchronization of A.C. supply means ________

1. different phase sequence
2. same phase sequence
3. zero phase
4. using a transformer

✅ Correct Answer: 2

How many types of phase sequence indicators are there?

1. 1
2. 5
3. 2
4. 10

✅ Correct Answer: 3

A rotating phase sequence indicator consists of _____

1. 1 coil
2. 2 coils
3. 5 coils
4. 3 coils

✅ Correct Answer: 4

The three coils are _____

1. star connected
2. delta connected
3. not connected
4. shorted

✅ Correct Answer: 2

Excitation of the three coils produces _____

1. a static magnetic field
2. a rotating magnetic field
3. a static electric field
4. a rotating electric field

✅ Correct Answer: 2

Eddy e.m.f produces a torque.

1. True
2. False
3. all of the above
4. None of the mentioned

✅ Correct Answer: 1

Disc rotation is determined by ____

1. the supply voltage
2. an arrow
3. the turns ratio
4. the load current

✅ Correct Answer: 2

Low voltage signals can be measured by _______

1. amplifiers
2. transformers
3. transformers
4. voltmeters

✅ Correct Answer: 1

Input impedance of an electronic voltmeter is _____

1. low
2. high
3. medium
4. zero

✅ Correct Answer: 2

Meter can be isolated from the circuit in a basic D.C. electronic voltmeter.

1. True
2. False
3. all of the above
4. None of the mentioned

✅ Correct Answer: 1

Bridge is balanced by ______

1. galvanometer
2. oscillator
3. zero adjustment resistor
4. head phone

✅ Correct Answer: 3

What is the effect of the input on the transistor Q2?

1. bias on Q2 decreases
2. bias on Q2 is constant
3. bias on Q2 is zero
4. bias on Q2 increases

✅ Correct Answer: 4

What is basic range of a meter?

1. causes maximum deflection
2. causes minimum deflection
3. causes zero deflection
4. causes medium deflection

✅ Correct Answer: 1

High range can be obtained in a basic D.C. electronic voltmeter by ________

1. a transformer
2. an attenuator
3. a transducer
4. a resistor

✅ Correct Answer: 2

Sensitivity of electronic voltmeter is high.

1. True
2. False
3. all of the above
4. None of the mentioned

✅ Correct Answer: 1

Overloading is ________

1. damages the meter
2. increases the temperature
3. doesn’t affect the meter
4. decreases the sensitivity

✅ Correct Answer: 3

Input impedance of a voltmeter is ______

1. high
2. low
3. medium
4. zero

✅ Correct Answer: 1

Input impedance depends on _____

1. resistance
2. capacitance
3. inductance
4. voltage

✅ Correct Answer: 2

At high frequencies the capacitive reactance ____

1. is constant
2. increases
3. decreases
4. becomes zero

✅ Correct Answer: 3

Voltage ranges in a meter are _____

1. 5-10-15
2. 20-50-100
3. 0.5-1-1.5
4. 1-3-10

✅ Correct Answer: 4

Linear meter with 1% accuracy must have ______

1. 100 divisions
2. 50 divisions
3. 200 divisions
4. 500 divisions

✅ Correct Answer: 1

Decibel covers a small range of values.

1. True
2. False
3. all of the above
4. None of the mentioned

✅ Correct Answer: 2

Noise is a function of ______

1. voltage
2. current
3. bandwidth
4. frequency

✅ Correct Answer: 3

Current can be measured effectively by making use of ____

1. d.c. voltmeter
2. a.c. ammeter
3. d.c. ammeter
4. a.c. voltmeter

✅ Correct Answer: 4

Average responding voltmeter is cheap and accurate.

1. True
2. False
3. all of the above
4. None of the mentioned

✅ Correct Answer: 1

R.M.S value means ______

1. root mean square
2. rate mean second
3. root median second
4. rate mode second

✅ Correct Answer: 1

Meter reading is obtained by _____

1. sensing voltage
2. sensing heat power
3. sensing current
4. sensing resistance

✅ Correct Answer: 2

Measurement of heat power ________

1. uses a heat sink
2. uses a thermometer
3. uses a thermocouple
4. uses a black body

✅ Correct Answer: 3

Sufficient heating of the heater is ensured by ______

1. increasing the temperature
2. making use of induction coil
3. amplifying d.c. input
4. amplifying a.c. input

✅ Correct Answer: 4

What is the main disadvantage of a true r.m.s responding voltmeter?

1. presence of transducer
2. presence of thermocouple
3. presence of transformer
4. presence of oscillator

✅ Correct Answer: 2

What is the naming convention for the two thermocouples?

1. thermocouple 1 and thermocouple 2
2. input thermocouple and output thermocouple
3. measuring thermocouple and balancing thermocouple
4. internal thermocouple and external thermocouple

✅ Correct Answer: 3

Sensitivity is of the order of ______

1. MV
2. V
3. GV
4. mV

✅ Correct Answer: 4

Response of thermocouples is fast.

1. True
2. False
3. all of the above
4. None of the mentioned

✅ Correct Answer: 2

Electronic multimeter measures ______

1. voltage, current and resistance
2. voltage, current and resistance
3. current and power
4. energy and power

✅ Correct Answer: 1

Basic circuit of multimeter consists ______

1. of a.c. amplifier
2. of d.c. amplifier
3. operational amplifier
4. power amplifier

✅ Correct Answer: 2