Measurement And Instrumentation - Practice Test

[#81] The resistance of two coils of a watt-meter are 0.0 Ω and 100 Ω respectively and both are non-inductive. The current through a resistance load is 20 A and the voltage across it is 30 V. In one of the two ways of connecting the voltage coil, the error in the reading would be

(A) 0.1% too high

(B) 0.2% too high

(C) 1.5% too high

(D) zero

Correct Answer

(D) zero

[#82] The use of thermocouple meters for ac measurement leads to a meter scale which is

(A) Linear

(B) Square law

(C) Logarithmic

(D) Exponentia

Correct Answer

(B) Square law

[#83] Which one of the following statements is not correct in connection with electrodynamic instruments?

(A) As the coils are air-cored, these instruments are free from hysteresis and eddy current losses

(B) These instruments have a high torque/weight ratio and hence have a high sensitivity

(C) These instruments can be used on both a.c. and d.c. and are very useful where accurate r.m.s. values of voltage irrespective of waveforms, are required

(D) These are more expensive than either PMMC or moving-iron type instruments

Correct Answer

(B) These instruments have a high torque/weight ratio and hence have a high sensitivity

[#84] Which of the following equipment can check the condition of a transistor?

(A) Current tracer

(B) Ohmmeter

(C) Digital display meter

(D) All of these

Correct Answer

(D) All of these

[#85] The scale used for moving coil meter is

(A) non-linear

(B) linear

(C) square scale

(D) log scale

Correct Answer

(B) linear

Measurement And Instrumentation - Study Mode

[#81] The resistance of two coils of a watt-meter are 0.0 Ω and 100 Ω respectively and both are non-inductive. The current through a resistance load is 20 A and the voltage across it is 30 V. In one of the two ways of connecting the voltage coil, the error in the reading would be

Correct Answer

[#82] The use of thermocouple meters for ac measurement leads to a meter scale which is

Correct Answer

[#83] Which one of the following statements is not correct in connection with electrodynamic instruments?

Correct Answer

[#84] Which of the following equipment can check the condition of a transistor?

Correct Answer

[#85] The scale used for moving coil meter is

Correct Answer