Instruments and measurements. Part – 1

1. The dynamometer wattmeter can be used to measure

A. DC power only

B. AC power only

C. AC and DC power

D. AC power of 1- phase circuit

2. To extend the range of voltmeter a high resistance is connected in series with it and is called

A. Shunt

B. Multiplier

C. Both A and B

D. None of the above

3. Which of the following instruments can have full scale deflection of 300⁰?

A. PMMC

B. Electrostatic

C. Hot wire

D. Induction type

4. _______type instruments has identical calibration for AC as well as DC values.

A. hot wire

B. moving coil

C. induction type

D. moving iron

5. In the measurement of power by two wattmeter’s method, when the readings of the two wattmeter’s are equal and opposite, it can be concluded that power factor is

A. Lagging

B. Leading

C. Unity

D. Zero

6. Scale of instruments will uniform it

A. Deflecting torque varies directly as the deflecting angle

B. Control torque varies directly as the deflecting angle

C. Both a and b

D. Damping torque varies directly as the deflecting angle

7. Which of the following can be measured by LVDT?

A. Displacement

B. Velocity

C. Acceleration

D. Any of the above

8. An open resistor, when checked with an ohm meter reads

A. Zero

B. High but within tolerance

C. Infinite

D. Low but not zero

9. A moving iron type instrument has,

A. Uniform scale

B. Non-uniform scale

C. Very less weight

D. All of these

10. If the voltmeter is connected in series with the load in a circuit, what will happen?

A. Load will not work properly

B. Voltmeter will show wrong reading

C. Very less voltage across the load

D. All of the above