Exercise: Measurements And Instrumentation

Questions for: Measurements And Instrumentation

Assertion (A): Schering bridge is a low voltage bridge.

Reason (R): Schering bridge is very commonly used for measurement of capacitance.

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: D

Schering bridge is a high voltage bridge.

📖
📝
💬
👁️
Two numbers are 131 ± 5 and 629 ± 3. The sum of the numbers with range of doubt is
A:
760 ± 8
B:
760 ± 2
C:
760 + 8
D:
760 - 8
Answer: A

The numbers can be 131 + 5, 131 - 5, 629 - 3. Therefore, the sum can be 760 ± 8.

📖
📝
💬
👁️
Which of these has a magnetic brake?
A:
Thermocouple ammeter
B:
Energy meter
C:
Dynamometer wattmeter
D:
Frequency meter
Answer: B

Braking torque, in an energy meter, is provided by a magnet.

📖
📝
💬
👁️
A meter coil has a resistance of 100 Ω and a full scale deflection current of 10 mA. To convert it into a voltmeter of 0-200 V range, the series resistance should be
A:
20 kΩ
B:
19.9 kΩ
C:
1.9 kΩ
D:
20.1 kΩ
Answer: B

.

📖
📝
💬
👁️
The power input and output in a device are 3650 W and 3385 W with each reading in doubt by ± 10 W. The percentage uncertainty in losses is
A:
± 7.55%
B:
± 3.77%
C:
± 11.32%
D:
± 15.09%
Answer: A

Losses = 3650 - 3385 = 265 W uncertainty = ± 20 W.

.

📖
📝
💬
👁️
Ad Slot (Above Pagination)
Quiz