# Home / ECE / Measurements and Instrumentation :: Section 1

### ECE :: Measurements and Instrumentation

1. To increase Q factor of a coil, the wire should be

2.  A. long B. thin C. thick D. long and thin   3. An ammeter of 0-25 A range has a guaranteed accuracy of 1% of full scale reading. The current measured is 5 A. The limiting error is

4.  A. 2% B. 2.5% C. 4% D. 5%   5. The coil of a moving iron instrument has a resistance of 500 Ω and an inductance of 1 H. It reads 250 V when a 250 V dc is applied. If series resistance is 2000 Ω, its reading when fed by 250 V, 50 Hz ac will be

6.  A. 260 V B. 252 V C. 250 V D. 248 V   7. In a CRO which of the following is not a part of electron gun

8.  A. cathode B. grid C. accelerating anode D. X - Y plates   9. If reference sound pressure P0 is 2 x 10-5 N/m2, a sound pressure of 90 dB is equal to

10.  A. 0.632 N/m2 B. 0.707 N/m2 C. 0.835 N/m2 D. 0.925 N/m2   11. Which of the following voltmeters would you use for measuring voltage across 20 kΩ resistance?

12.  A. Voltmeter having a resistance of 5 kΩ B. Voltmeter having a sensitivity of 1 kW/V C. Voltmeter having sensitivity of 10 kW/V D. None of the above   13. A single phase energy meter has the rating 1200 resolutions/ kWh. If a 500 W electric gadget is used for 4 hours, the energy meter will make

14.  A. 1200 revolutions B. 1800 revolutions C. 2100 revolutions D. 2400 revolutions   15. Assertion (A): De sauty's bridge is suitable only for pure capacitor.

Reason (R): Capacitors are mostly perfect.

16.  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   17. In which of the transformer is the secondary nearly short circuited under normal operating conditions?

18.  A. CT B. PT C. Distribution transformer D. Power transformer   19. 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

20.  A. 0.6 Ω B. 0.06 Ω C. 0.1 Ω D. 0.004 Ω   