Two resistors R1 = 36 ? � 5% and R2 = 75 ? � 5% are connected in series. The tot

CuriousTab

CuriousTab

Home Aptitude

Discussion

Home ‣ Electronics and Communication Engineering ‣ Measurements and Instrumentation Comments

Question
Two resistors R₁ = 36 ? � 5% and R₂ = 75 ? � 5% are connected in series. The total resistance is
Options
A. 111 � 0 ?
B. 111 � 2.778 ?
C. 111 � 5.55 ?
D. 111 � 7.23 ?

Correct Answer

111 � 5.55 ?

Explanation

Two resistors R1 = 36 ? � 5% and R2 = 75 ? � 5% are connected in series. The total resistance is 111

Total maximum error � (1.8 + 3.75) = � 5.55 ?.

Measurements and Instrumentation problems

Search Results

1. Figure shows an RC potentiometer to measure ac voltage. It is desired that V₀/V_i should be independent of frequency. The value of C should be
Options
A. 10 ?F
B. 11 ?F
C. 0.1 ?F
D. 0.09 ?F

2. Which of the following are needed both for protection and metering?
Options
A. Wattmeters
B. Instrument transformers
C. Energy meters
D. Power factor meters

3. The coil of a moving coil meter has 100 turns, is 40 mm long and 30 mm wide. The control torque is 240 x 10^-6 N-m on full scale. If B = 1 Wb/m², range of meter is
Options
A. 1 mA
B. 2 mA
C. 3 mA
D. 4 mA

4. Which of the following measurements using a dc potentiometer do not require standardisation of potentiometer?
Options
A. Measurement of unknown voltage
B. Measurement of resistance
C. Measurement of unknown current
D. Calibration of voltmeter

5. Wave A = 100 sin ?t and wave B = 100 cos ?t. Then
Options
A. rms values of the two waves are equal
B. rms values of A is more than that of B
C. rms values of A is less than that of B
D. rms values of the two waves may or may not be equal

6. The speed transducer using a drag cup rotor has the main advantage of
Options
A. very high accuracy
B. low energy requirement
C. cheap construction
D. all of the above

7. A digital voltmeter has a read out range from 0 to 999 counts. If the full scale reading is 9.999 V, the resolution is
Options
A. 1 V
B. 0.01 V
C. 1 mV
D. 1 ?V

8. It is required to measure angular position. Out of the transducers
1. Circular potentiometer
2. LVDT
3. E pick up
4. Synchro
The proper devices are
Options
A. 1, 2, 3, 4
B. 2 and 3
C. 1, 2, 4
D. 1 and 4

9. A moving coil instrument has a resistance of 0.6 ? 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
Options
A. 0.6 ?
B. 0.06 ?
C. 0.1 ?
D. 0.004 ?

10. Assertion (A): De sauty's bridge is suitable only for pure capacitor.
Reason (R): Capacitors are mostly perfect.
Options
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

Comments

There are no comments.

More in Electronics and Communication Engineering: