Question

Q.1. Operating torques in analogue instruments are

(a) deflecting and control (b) deflecting and damping (c) deflecting, control and damping (d) vibration and balancing

Q.2. An instrument transformer is used to extend the range of

(a) induction instrument (b) electrostatic instrument (c) moving coil instrument (d) any of the above

Q.3. A power factor meter is based on the principle of

(a) electrostatic instrument (b) Electrodynamometer instrument (c) Electro thermo type instrument (d) Rectifier type instrument.

Q.4.When using the terms "accuracy" and "precision" for measurements

a. "precision" implies less measurement error than "accuracy" b. "accuracy" implies less measurement error than "precision" c. "precision" measures the repeatability of a measurement d. both terms mean the same thing

Q.5. The bridge method commonly used for finding mutual inductance is

(A) Heaviside Campbell bridge (B) Schering bridge (C) De Sauty bridge (D) Wien bridge

Q.6. The Q-meter works on the principle of

(A) mutual inductance (B) self inductance (C) series resonance (D) parallel resonance

Q.7. A digital-to-analog converter with a full-scale output voltage of 3.5 V has a resolution close to 14 mV. Its bit size is

(A) 4 (B) 8 (C) 16 (D) 32

Q.8.Which of the following has the best accuracy

(A).MI meter (B).Moving coil meter (C).Rectifier type meter (D).Thermocouple meter

Q.9.A 0-10 A ammeter has a guaranteed accuracy of 1% of FSD.The limiting error while reading 2.5A

(A).1% (B).2% (C).4% (D).none of the above

Q.10.In a transducer the observed output deviates from the correct value by constant factor the resulting error is called

(A).Zero Error (B).Sensitivity Error (C).Non-confirmity Error (D).Hysteresis error

Q.11. If the current in a capacitor leads the voltage by 80°, the loss angle of the capacitor is

(a) 10° (b) 80° (c) 120° (d) 170°

Q.12. To avoid the effect of stray magnetic field in A.C. bridges we can use

(a) magnetic screening (b) Wagner earthing device (c) wave filters (d) any of the above

Q.13. The disc of an instrument using eddy current damping should be of

(a) conducting and magnetic material (b) non-conducting and magnetic material (c) conducting and non-magnetic material (d) none of the above

Q.14. An induction meter can handle current upto

(a) 10 A (b) 30 A (c) 60 A (d) 100 A

Q.15. Which of the following devices may be used for extending the range of instruments ?

(a) Shunts (b) Multipliers (c) Current transformers (d) Potential transformers (e) All of the above

Answer 1

Q.1. Operating torques in analogue instruments are

Ans: (c) deflecting, control and damping

Q.2. An instrument transformer is used to extend the range of

Ans: (a) induction instrument

Q.3. A power factor meter is based on the principle of

Ans: (b) Electrodynamometer instrument

Q.4.When using the terms "accuracy" and "precision" for measurements

Ans: (c) "precision" measures the repeatability of a measurement

Q.5. The bridge method commonly used for finding mutual inductance is

Ans: A) Heaviside Campbell bridge

Q.6. The Q-meter works on the principle of

Ans: (C) series resonance

Q.7. A digital-to-analog converter with a full-scale output voltage of 3.5 V has a resolution close to 14 mV. Its bit size is

Ans: (B) 8

Resolution (R) = V₀/2^N

14*10^-3 = 3.5/2^N

N=7.965

Q.8.Which of the following has the best accuracy

Ans: (B).Moving coil meter

Q.9.A 0-10 A ammeter has a guaranteed accuracy of 1% of FSD.The limiting error while reading 2.5A

Ans: (C).4%

error = (10*1)/100 = 0.1

%error = (0.1/2.5)*100 = 4%

Q.10.In a transducer the observed output deviates from the correct value by constant factor the resulting error is called

Ans: (B).Sensitivity Error

Q.11. If the current in a capacitor leads the voltage by 80°, the loss angle of the capacitor is

Ans:  (a) 10°

   Loss angle δ = 90 - 80 = 10°.

Q.12. To avoid the effect of stray magnetic field in A.C. bridges we can use

Ans: (a) magnetic screening

Q.13. The disc of an instrument using eddy current damping should be of

Ans: (c) conducting and non-magnetic material

Q.14. An induction meter can handle current upto

Ans:  (d) 100 A

Q.15. Which of the following devices may be used for extending the range of instruments ?

Ans: (e) All of the above