MCQOPTIONS
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MCQOPTIONS
This section includes 9294 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 7051. |
The advantage of LVDT over inductive bridge type transducer is that |
| A. | it gives high output for small changes in core position |
| B. | it can be used over a temperature range of - 265 C to 600 C |
| C. | it can measure displacement of moving object |
| D. | the error due to stray magnetic field is less |
| Answer» B. it can be used over a temperature range of - 265 C to 600 C | |
| 7052. |
Assertion (A): Megger is used to check insulation resistance of cables. Reason (R): Insulation resistance of cables is very high. |
| A. | Both A and R are true and R is correct explanation of A |
| B. | Both A and R are true but R is not correct explanation of A |
| C. | A is true R is false |
| D. | A is false R is true |
| Answer» B. Both A and R are true but R is not correct explanation of A | |
| 7053. |
Assertion (A): A power factor meter operates on dynamometer principle. Reason (R): A power factor meter does not have a control spring. |
| A. | Both A and R are true and R is correct explanation of A |
| B. | Both A and R are true but R is not correct explanation of A |
| C. | A is true R is false |
| D. | A is false R is true |
| Answer» C. A is true R is false | |
| 7054. |
A moving iron instrument can be used for dc as well as ac. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 7055. |
Assertion (A): A radiation pyrometer is very suitable for high temperature measurement.Reason (R): When temperature is high, a physical contact between hot body and thermometer is not desirable. |
| A. | Both A and R are true and R is correct explanation of A |
| B. | Both A and R are true but R is not correct explanation of A |
| C. | A is true R is false |
| D. | A is false R is true |
| Answer» B. Both A and R are true but R is not correct explanation of A | |
| 7056. |
For measuring current at a high frequency we should use |
| A. | moving iron instrument |
| B. | electrostatic instrument |
| C. | thermocouple instrument |
| D. | moving coil instrument |
| Answer» D. moving coil instrument | |
| 7057. |
In low power factor wattmeter, the pressure coil is connected |
| A. | to the supply side of current coil |
| B. | to the load side of current coil |
| C. | in either (a) or (b) |
| D. | across the mains |
| Answer» C. in either (a) or (b) | |
| 7058. |
The signal to noise ratio in telemetry should be better than |
| A. | 5 db |
| B. | 10 db |
| C. | 25 db |
| D. | 60 db |
| Answer» E. | |
| 7059. |
Two resistances are R1 = 36 5% and R2 = 75 5%. If they are connected in parallel, the limiting error in percent will be |
| A. | 5% |
| B. | 10% |
| C. | 15% |
| D. | 20% |
| Answer» D. 20% | |
| 7060. |
For critical damping, the resistance in D'Arsonval galvanometer circuit should be equal to |
| A. | <img src="/_files/images/electronics-and-communication-engineering/measurements-and-instrumentation/232-69-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/measurements-and-instrumentation/232-69-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/measurements-and-instrumentation/232-69-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/measurements-and-instrumentation/232-69-4.png"> |
| Answer» B. <img src="/_files/images/electronics-and-communication-engineering/measurements-and-instrumentation/232-69-2.png"> | |
| 7061. |
An ac bridge uses galvanometer as detector. |
| A. | True |
| B. | False |
| Answer» C. | |
| 7062. |
It is required to measure a low magnitude high frequency current. The proper instrument is |
| A. | moving iron |
| B. | dynamometer |
| C. | thermocouple |
| D. | induction |
| Answer» D. induction | |
| 7063. |
Bridge circuits using RTD in temperature measurement usually employ 3 lead system so as to obtain |
| A. | higher sensitivity |
| B. | better impedance matching |
| C. | compensation for signal wire resistance |
| D. | reduction in power consumption |
| Answer» D. reduction in power consumption | |
| 7064. |
The numbers of accelerating anodes in a CRO is |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 7065. |
Consider the following statements regarding phase sensitive detector The detector reads zero when phases of input signal and reference signal are different.The detector acts as a linear rectifier.The detector can be used as vector voltmeter. Of the above statements which are correct? |
| A. | 1, 2, 3 |
| B. | 1 and 2 |
| C. | 2 and 3 |
| D. | 1 and 3 |
| Answer» D. 1 and 3 | |
| 7066. |
In a Weston synchronoscope, the moving coil is connected across |
| A. | bus bar |
| B. | incoming alternator |
| C. | lamp |
| D. | fixed coils |
| Answer» B. incoming alternator | |
| 7067. |
The coding system generally used in digital telemetry is |
| A. | PPM (Pulse position modulation) |
| B. | PAM (Pulse amplitude modulation) |
| C. | PCM (Pulse code modulation) |
| D. | PDM (Pulse duration modulation) |
| Answer» D. PDM (Pulse duration modulation) | |
| 7068. |
The advantage of semiconductor strain gauge over resistance strain gauge is |
| A. | it is more sensitve |
| B. | it is more linear |
| C. | it is less temperature dependent |
| D. | it is cheaper |
| Answer» B. it is more linear | |
| 7069. |
Assertion (A): Electrodynamic instrument is not used as ammeter or voltmeter.Reason (R): Electrodynamic instrument is more costly than PMMC and moving iron instrument. |
| A. | Both A and R are true and R is correct explanation of A |
| B. | Both A and R are true but R is not correct explanation of A |
| C. | A is true R is false |
| D. | A is false R is true |
| Answer» B. Both A and R are true but R is not correct explanation of A | |
| 7070. |
Consider the following statements regarding electro-dynamometer type indicating instrument It can be used for measuring Direct currentAlternating currentDirect voltageAlternating voltage Of these statements |
| A. | 1 and 2 are corect |
| B. | 3 and 4 are correct |
| C. | 1 and 3 are correct |
| D. | 1, 2, 3, 4 are correct |
| Answer» E. | |
| 7071. |
Consider the following statements about mutual inductances: The value should remain constant under all conditions.The mutual inductance should not vary with temperature.The inductance should be independent of excitation.They have two coils wound on a bobbin of hard magnetic material, coils being separated by a range. Out of the above, correct statement are |
| A. | 2, 3, 4 |
| B. | 1, 2, 3 |
| C. | 1, 3, 4 |
| D. | 1, 2, 4 |
| Answer» C. 1, 3, 4 | |
| 7072. |
The sensitivity of a potentiometer can be increased by |
| A. | increasing the length of wire |
| B. | decreasing the length of wire |
| C. | increasing the current in the wire |
| D. | decreasing the current in the wire |
| Answer» B. decreasing the length of wire | |
| 7073. |
Burden of an instrument transformer is expressed in |
| A. | A |
| B. | V-A |
| C. | Ω |
| D. | watt |
| Answer» C. Ω | |
| 7074. |
Which of the following devices should be used for accurate measurement of a low dc voltage? |
| A. | Small range moving coil voltmeter |
| B. | Dc potentiometer |
| C. | Small range thermocouple voltmeter |
| D. | Hot wire instrument |
| Answer» C. Small range thermocouple voltmeter | |
| 7075. |
An electrodynamometer instrument has the advantage of |
| A. | freedom from hysteresis and eddy currents because air cored coils are used |
| B. | freedom from hysteresis and eddy currents because cores of coils have special ferromagnetic material |
| C. | high torque/weight ratio |
| D. | low cost |
| Answer» B. freedom from hysteresis and eddy currents because cores of coils have special ferromagnetic material | |
| 7076. |
Four terminal approach is used in measuring low resistance because it |
| A. | eliminates thermoelectric energy |
| B. | eliminates stray capacitance |
| C. | eliminates stray inductance |
| D. | eliminates the effect of leads and contacts |
| Answer» E. | |
| 7077. |
In Weston synchronoscope the fixed coils are connected across |
| A. | bus bars |
| B. | incoming alternator |
| C. | lamp |
| D. | either (a) or (b) |
| Answer» C. lamp | |
| 7078. |
Which of the following is not a transducer in true sense? |
| A. | Thermocouple |
| B. | Piezo electric |
| C. | Photo electric cell |
| D. | LCD |
| Answer» E. | |
| 7079. |
The stator of phase shifting transformer for use in conjunction with an ac potentiometer has a |
| A. | single phase winding |
| B. | two phase winding |
| C. | 3 phase winding |
| D. | either (a) or (c) |
| Answer» C. 3 phase winding | |
| 7080. |
A Q meter uses the principle of |
| A. | variation of self inductance |
| B. | variation of mutual inductance |
| C. | series resonance |
| D. | none of the above |
| Answer» D. none of the above | |
| 7081. |
In semiconductor strain gauge |
| A. | resistance increases with strain |
| B. | resistance decreases with strain |
| C. | resistance increases with strain in p type and decreases with strain in n type |
| D. | resistance increases with strain in n type and decreases with strain in p type |
| Answer» D. resistance increases with strain in n type and decreases with strain in p type | |
| 7082. |
The adjustment of position of shading bands, in an energy meter, is done to provide |
| A. | friction compensation |
| B. | creep compensation |
| C. | braking torque |
| D. | none of the above |
| Answer» B. creep compensation | |
| 7083. |
Two wattmeter method of 3-phase power measurement can be used to find |
| A. | total active power |
| B. | total active power and power factor |
| C. | total active power and reactive power |
| D. | total active power, power factor, apparent power, and reactive power |
| Answer» E. | |
| 7084. |
The multiplier resistance and meter coil in a voltmeter are in |
| A. | series |
| B. | parallel |
| C. | series-parallel |
| D. | either (a) or (b) |
| Answer» B. parallel | |
| 7085. |
Panel type instruments are used in |
| A. | power stations |
| B. | automobiles |
| C. | industries |
| D. | all of the above |
| Answer» E. | |
| 7086. |
Assertion (A): In a CRT, grid is kept at negative potential with respect to cathode.Reason (R): The function of grid in an electronic tube is to control the number of electrons. |
| A. | Both A and R are true and R is correct explanation of A |
| B. | Both A and R are true but R is not correct explanation of A |
| C. | A is true R is false |
| D. | A is false R is true |
| Answer» B. Both A and R are true but R is not correct explanation of A | |
| 7087. |
In a Weston synchronoscope the deflecting torque is zero when |
| A. | currents in fixed and moving coils are in phase |
| B. | currents in fixed and moving coils are out of phase by 90 |
| C. | currents in fixed and moving coils are out of phase by 60 |
| D. | none of the above |
| Answer» C. currents in fixed and moving coils are out of phase by 60 | |
| 7088. |
Magnetic flux can be measured by |
| A. | capacitive pick up |
| B. | inductive pick up |
| C. | resistive pick up |
| D. | hall effect pick up |
| Answer» E. | |
| 7089. |
A peak responding ac voltmeter using a half wave rectifier has been calibrated to read 1 V for 1 V rms sine wave input. If input is 1 V dc the reading will be |
| A. | 0.707 V |
| B. | 0.707 or 0 V |
| C. | 1.414 V |
| D. | 1.414 or 0 V |
| Answer» C. 1.414 V | |
| 7090. |
For measuring inductance with high Q, we should use |
| A. | Maxwell's bridge |
| B. | Maxwell Wien bridge |
| C. | Hay's bridge |
| D. | Either (a) or (b) |
| Answer» D. Either (a) or (b) | |
| 7091. |
A resistance strain gauge has a resistance of about |
| A. | 100 Ω |
| B. | 25 Ω |
| C. | 10 Ω |
| D. | 1 Ω |
| Answer» B. 25 Ω | |
| 7092. |
The temperature coefficient of resistance for a thermistor is |
| A. | low and negative |
| B. | low and positive |
| C. | high and negative |
| D. | high and positive |
| Answer» D. high and positive | |
| 7093. |
To measure an unknown ac voltage by an ac potentiometer it is desirable that supply for the potentiometer is taken |
| A. | from a battery |
| B. | from a source which is not the same as unknown voltage |
| C. | from the same source as the unknown voltage |
| D. | either (a) or (b) |
| Answer» D. either (a) or (b) | |
| 7094. |
A linear displacement digital transducer generally uses |
| A. | straight binary code |
| B. | BCD |
| C. | gray code |
| D. | hexadecimal code |
| Answer» D. hexadecimal code | |
| 7095. |
A moving iron instrument has |
| A. | two iron vanes, one fixed and one movable |
| B. | two movable iron vanes |
| C. | two aluminium vanes, one fixed and one movable |
| D. | two vanes, one fixed made of Aluminium and the other movable made of iron |
| Answer» B. two movable iron vanes | |
| 7096. |
The dynamic characteristics of capacitive transducer are similar to those of |
| A. | LP filter |
| B. | HP filter |
| C. | notch filter |
| D. | band stop filter |
| Answer» C. notch filter | |
| 7097. |
Capacitive transducer is superior to inductive type for measurement of capacitance because of |
| A. | absence of non-linearity |
| B. | high frequency response |
| C. | small size |
| D. | high accuracy |
| Answer» C. small size | |
| 7098. |
Which of the following effects is used in measurement of magnetic flux? |
| A. | Hall effect |
| B. | Seeback effect |
| C. | Piezo electric effect |
| D. | Photoelectric effect |
| Answer» B. Seeback effect | |
| 7099. |
Loading effect is primarily caused by instruments having |
| A. | high resistance |
| B. | high sensitivity |
| C. | low sensitivity |
| D. | high range |
| Answer» D. high range | |
| 7100. |
The electrical power to a megger is provided by |
| A. | battery |
| B. | inverter |
| C. | permanent magnet dc generator |
| D. | ac generator |
| Answer» D. ac generator | |