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
- (C) 0.8 leading
- (D) Zero
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