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Recent questions and answers in Electrical Measurements and Instrumentation

3 answers 91 views
1 answer 14 views

A VTVM can be used to measure (a) dc voltage only (b) ac voltage only (c) both (a) and (b) (d) None of the above 

answered Jul 5 in Electrical Measurements and Instrumentation
1 answer 52 views

A digital voltmeter has a read-out range from 0 to 9999 counts. When full scale reading is 9.999 V, the resolution of the instrument will be (a) 100 mV (b) 99 mV (c) 9 mV (d) 1 mV 

answered Jun 27 in Electrical Measurements and Instrumentation
2 answers 111 views
0 answers 29 views
1 answer 27 views

Eddy current damping is normally used in the instruments of (a) Induction type (b) Moving iron type (c) Permanent magnet moving coil type (d) Nothing can be said 

answered Aug 1, 2018 in Electrical Measurements and Instrumentation
1 answer 11 views

Hot wire ammeter is used (a) only for dc circuit (b) only for ac circuit (c) both (a) and (b) (d) Either (a) or (b) 

answered Aug 1, 2018 in Electrical Measurements and Instrumentation
2 answers 13 views
1 answer 22 views

The Maxwell bridge is used for measuring (a) Capacitance (b) Dielectric loss (c) Inductance (d) Phase angle 

answered Jul 18, 2018 in Electrical Measurements and Instrumentation
2 answers 34 views

A Wien bridge is used to measure (A) quality factor of a coil (B) audio frequency of a signal (C) capacitance of a capacitor (D) inductance of a coil 

answered Jul 5, 2018 in Electrical Measurements and Instrumentation
2 answers 65 views

The bridge used to measure the dielectric loss of an insulator is: A) Anderson bridge B) Wien’s bridge C) Schering bridge D) Any of the above

answered Jul 3, 2018 in Electrical Measurements and Instrumentation
1 answer 20 views

Megger is used to measure (a) very high resistance or insulation resistance. (b) low resistance. (c) high resistance. (d) very low resistance. 

answered Jul 3, 2018 in Electrical Measurements and Instrumentation
1 answer 79 views

Digital meters are superior over analogue meters because (A) less expensive (B) output reading is binary in nature (C) output impedance is less (D) installation is easy as panel meters 

answered Jun 25, 2018 in Electrical Measurements and Instrumentation
1 answer 12 views

Which of the following instruments can be used for measurement of very high value resistances such as insulation resistance in industries? A) Wheatstone bridge B) Megger C) Ohm-meter D) Resistive potentiometer 

answered Jun 17, 2018 in Electrical Measurements and Instrumentation
1 answer 23 views

A 10A DC Ammeter has a resistance of 0.1 Ω is to be extended to 50 A, the required shunt wire is A) Manganin wire of 20 m Ω B) Constantan wire of 20 m Ω C) Manganin wire of 25 m Ω D) Constantan wire of 25 m Ω

answered Jun 17, 2018 in Electrical Measurements and Instrumentation
1 answer 14 views

Two stator windings of AC servomotors are oriented: A) 90 degree (mechanical) apart B) 90 degree (electrical) apart C) 180 degree (mechanical) apart D) 180 degree (electrical) apart

answered Jun 17, 2018 in Electrical Measurements and Instrumentation
1 answer 18 views

 Highest flux density exists inside which of the following instruments? A) Electrodynamic instruments B) Hot wire instruments C) Moving iron instruments D) Moving coil instruments

answered Jun 17, 2018 in Electrical Measurements and Instrumentation
1 answer 18 views

 In the measurement of power of balanced load by two wattmeter method in a 3-phase circuit, The readings of the wattmeters are 4 kW and 2 kW respectively, the later is being taken after reversing the connections of current coil. the power factor and reactive power of the load is A) 0.2 & 6 kVAR B) 0.2 & 6 √3 kVAR C) 0.32 & 2 kVAR D) 0.32 & 2 √3 kVAR

answered Jun 17, 2018 in Electrical Measurements and Instrumentation
0 answers 19 views

The full scale range of PMMC voltmeter is 100 V and its sensitivity is 1000 Ω/V. If the meter reads 50 V, the current through the voltmeter is (A) 0.05 mA (B) 0.5 mA (C) 5 mA (D) 50 mA 

asked Jun 4, 2018 in Electrical Measurements and Instrumentation
0 answers 70 views

The power in a 3-phase load is measured by two watt meters. If one watt meter reads zero, then the load power factor is (A) Zero (B) 0.5 (C ) 0.866 (D) unity 

asked Jun 4, 2018 in Electrical Measurements and Instrumentation
0 answers 17 views

The burden of the instrument transformers is (A) VA rating (B) secondary winding current (C) secondary winding voltage (D) (secondary winding current)2 × resistance of secondary winding  

asked Jun 4, 2018 in Electrical Measurements and Instrumentation
0 answers 20 views

The most accurate instrument for measuring phase difference between two signals is (A) X− Y plotter (B) oscilloscope (C) phase sensitive detector (D) electronic counter/timer 

asked Jun 4, 2018 in Electrical Measurements and Instrumentation
0 answers 22 views

Measurement of power by voltmeter and ammeter method in a circuit resulted in calculated maximum errors of ±1 % and ± 2 %, respectively. The likely error in calculated power is (A) ± 3 % (B) ± 0.022 % (C) ± 1.5 % (D) ± 0.22 % 

asked Jun 4, 2018 in Electrical Measurements and Instrumentation
1 answer 14 views

In a standard multimeter for measuring AC voltage, parameter of _____ voltage is measured

answered May 29, 2018 in Electrical Measurements and Instrumentation
1 answer 10 views

 In dynamometer type of wattmeter, which of the coil is split up into two parts?

answered May 29, 2018 in Electrical Measurements and Instrumentation
1 answer 10 views

Moire fringes are used to measure rotary displacement along with _____.

answered May 29, 2018 in Electrical Measurements and Instrumentation
1 answer 13 views

The function of measurement system is/are _____.

answered May 29, 2018 in Electrical Measurements and Instrumentation
1 answer 92 views

A 0-10 A ammeter has a guaranteed accuracy of 1% of full scale deflection, the limiting error while reading 2.5 A will be (a) 1% (b) 2% (c) 4% (d) None of these 

answered May 27, 2018 in Electrical Measurements and Instrumentation
0 answers 23 views

The constant of a given energy meter is 500 revolution/kWh. At the test 4.4 kW full load, meter completes 50 revolutions in 86 seconds. The percentage error of the meter is (a) –4.86% (b) 4.86% (c) 2.0% (d) 3.0%

asked May 26, 2018 in Electrical Measurements and Instrumentation
0 answers 19 views

Which of the following instruments is equally accurate on ac as well as dc circuits ? (a) PMMC voltmeter (b) Dynamometer wattmeter (c) Moving iron ammeter (d) Induction wattmeter 

asked May 26, 2018 in Electrical Measurements and Instrumentation
0 answers 14 views

The moving system of an indicating type of electrical instrument is subjected to (a) a deflecting torque (b) a controlling torque (c) a damping torque (d) All of the above

asked May 26, 2018 in Electrical Measurements and Instrumentation
0 answers 9 views

Energy meter runs slowly even if power is not used. This error is called (a) Speed error (b) Phase error (c) Creeping error (d) None of these

asked May 26, 2018 in Electrical Measurements and Instrumentation
0 answers 13 views

The type of instruments used mainly for standardizing instruments in laboratories is (a) Indicating instrument (b) Integrating instrument (c) Absolute instrument (d) Recording instrument  

asked May 26, 2018 in Electrical Measurements and Instrumentation
0 answers 32 views

What will happen if a voltmeter is connected like an ammeter in series of the load ? (a) The meter will burn out. (b) The measurement will be too high. (c) The same current will flow as would have been with ammeter in circuit. (d) There will be almost no current in the circuit. 

asked May 26, 2018 in Electrical Measurements and Instrumentation
0 answers 11 views

Series resistance required to read 0-250 V with a moving coil instrument of internal resistance 2 ohm and full scale deflection of 50 mA is (a) 49998 Ω (b) 4998 Ω (c) 498 Ω (d) 49.8 Ω

asked May 26, 2018 in Electrical Measurements and Instrumentation
0 answers 13 views

Which of the following is not a method of resistance measurement ? (a) Ammeter – Voltmeter method (b) Post – Office box method (c) Ohm – Meter method (d) Two wattmeter method 

asked May 26, 2018 in Electrical Measurements and Instrumentation
0 answers 374 views

Internal resistance of a micro-ammeter is 500 ohm. Shunt resistance required to increase its range from 0-100 µA to 0-10 A will be approximately (a) 0.05 Ω (b) 0.005 Ω (c) 0.5 Ω (d) 5.0 Ω

asked May 26, 2018 in Electrical Measurements and Instrumentation
0 answers 7 views

Hay bridge is suitable for measuring following type of inductance (a) having Q greater than 10. (b) having Q less than 10. (c) having any value of Q. (d) having phase angle of reactance very large. 

asked May 26, 2018 in Electrical Measurements and Instrumentation
0 answers 18 views

In a particular meter, the deflecting torque is directly proportional to the current flowing through it, the type of meter is (a) moving coil (b) moving iron (c) induction (d) electro-static  

asked May 26, 2018 in Electrical Measurements and Instrumentation
0 answers 22 views

For measurement of low resistance, the bridge used is (a) Wheatstone (b) Kelvin (c) Maxwell (d) Anderson

asked May 26, 2018 in Electrical Measurements and Instrumentation
0 answers 18 views

While measuring power in a three phase load by two wattmeter method, the reading of two wattmeter are equal and opposite, when (a) load is balanced (b) power factor is unity (c) phase angle is between 60° to 90° (d) the load is purely inductive 

asked May 26, 2018 in Electrical Measurements and Instrumentation
0 answers 14 views

If a dynamometer wattmeter is connected in an ac circuit, the power indicated by the wattmeter will be (a) volt-ampere product (b) average power (c) peak power (d) instantaneous power 

asked May 26, 2018 in Electrical Measurements and Instrumentation
0 answers 20 views

A compensated wattmeter has its reading corrected for error due to (a) Frequency (b) Friction (c) Power consumed in current coil (d) Power consumed in pressure coil

asked May 26, 2018 in Electrical Measurements and Instrumentation
0 answers 11 views

A null type of instrument as compared to a deflecting type instrument has (a) higher accuracy (b) lower sensitivity (c) faster response (d) All of the above  

asked May 26, 2018 in Electrical Measurements and Instrumentation
0 answers 8 views

The sensitivity of a voltmeter using 0-5 mA meter movement is (a) 200 Ω/V (b) 150 Ω/V (c) 100 Ω/V (d) 50 Ω/V 

asked May 26, 2018 in Electrical Measurements and Instrumentation
0 answers 11 views

The disc of domestic supply energy meter is made of which material ? (a) Zinc (b) Copper (c) Aluminium (d) Silver 

asked May 26, 2018 in Electrical Measurements and Instrumentation
0 answers 19 views

The material of hair spring used in measuring instruments is made of which of material of the following : (a) Copper (b) Bronze (c) Alnico (d) None of these

asked May 26, 2018 in Electrical Measurements and Instrumentation
0 answers 19 views

The moving iron voltmeter indicates (a) the same value for dc and ac voltages. (b) lower values for ac voltage than for corresponding dc voltage. (c) higher value for ac voltage than for corresponding dc voltage. (d) none of these. 

asked May 25, 2018 in Electrical Measurements and Instrumentation
0 answers 15 views

An average reading digital multimeter reads 10 V when fed with a triangular wave, symmetric about the time axis. For the same input the r.m.s. reading meter will read

asked May 25, 2018 in Electrical Measurements and Instrumentation
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