MCQ Practice Test Measurement and Instrumentation - Set 02 - ObjectiveBooks

Practice Test: Question Set - 02

1. In a Weston synchronoscope, the fixed coils are connected across
(A) Bus-bars
(B) Incoming alternator
(C) A lamp
(D) None of the above

2. In a Weston frequency meter, the magnetic axes of the two fixed coils are
(A) Parallel
(B) Perpendicular
(C) Inclined at 60°
(D) Inclined at 120°

3. If an instrument has cramped scale for larger values, then it follows
(A) Square law
(B) Logarithmic law
(C) Uniform law
(D) None of the above

4. Alternating current is measured by
(A) Induction ammeter
(B) Permanent magnet type ammeter
(C) Electrostatic ammeter
(D) Moving iron repulsion type voltmeter

5. The power of a n-phase circuit can be measured by using a minimum of
(A) (n - 1) wattmeter elements
(B) n wattmeter elements
(C) (n + 1) wattmeter elements
(D) 2n wattmeter elements

6. To measure radio frequency, the suitable frequency meter is
(A) Weston frequency meter
(B) Reed vibrator frequency meter
(C) Heterodoxy frequency meter
(D) Electrical resonance frequency meter

7. Induction type single phase energy meters measure electric energy in
(A) kW
(B) Wh
(C) kWh
(D) VAR

8. In majority of instruments damping is provided by
(A) Fluid friction
(B) Spring
(C) Eddy currents
(D) All of the above

9. A moving iron instrument can be used for
(A) D.C. only
(B) A.C. only
(C) Both D.C. and A.C.
(D) None of the above

10. In a 3-phase power measurement by two wattmeter method, both the watt meters had identical readings. The power factor of the load was
(A) Unity
(B) 0.8 lagging