IndiaBIX

Electronics and Communication Engineering - Measurements and Instrumentation

Exercise : Measurements and Instrumentation - Section 1
11.
A moving coil instrument has a resistance of 0.6 Ω and full scale deflection at 0.1 A. To convert it into an ammeter of 0-15 A range, the resistance of shunt should be
0.6 Ω
0.06 Ω
0.1 Ω
0.004 Ω
Answer: Option
Explanation:

.

12.
A piezoelectric force transducer has a charge sensitivity of 20 pC/N. It is connected to a charge amplifier and overall gain of transducer and amplifier is 50 mV/N. The gain of amplifier is
1 mV/pC
1.5 mV/pC
2.5 mV/pC
4 mV/pC
Answer: Option
Explanation:

.

13.
An LVDT is used to measure displacement. The LVDT feeds a Voltmeter of 0-5 V range through a 250 gain amplifier. For a displacement 0.5 mm the output of LVDT is 2 mV. The sensitivity of instrument is
0.1 V/mm
0.5 V/mm
1 V/mm
5 V/mm
Answer: Option
Explanation:

Final output = 2 x 10-3 x 250 = 0.5 V.

.

14.

Assertion (A): When a wattmeter is used for low impedance loads, the pressure coil is connected across the load.

Reason (R): A wattmeter measures apparent power.

Both A and R are true and R is correct explanation of A
Both A and R are true but R is not correct explanation of A
A is true R is false
A is false R is true
Answer: Option
Explanation:

Wattmeter measures active power.

15.
As per BIS there are 6 accuracy classes of instruments.
True
False
Answer: Option
Explanation:

There are 8 classes of accuracy as per BIS.

Quick links
Quantitative Aptitude
Verbal (English)
Reasoning
Programming
Interview
Placement Papers