Practice Test: Question Set - 10
1. According to application, instruments are classified as
- (A) Switch board
- (B) Portable
- (C) Both (A) and (B)
- (D) None of these
2. The switch board instruments
- (A) Should be mounted in vertical position
- (B) Should be mounted in horizontal position
- (C) Either (A) or (B)
- (D) Neither (A) nor (B)
3. In a Schering bridge the potential of the detector above earth potential is
- (A) A few volts only
- (B) 1 kV
- (C) 5 kV
- (D) 10 kV
4. A multi-range instrument has
- (A) Multiple shunt or series resistances inside
the meter
- (B) Multi-coil arrangement
- (C) Variable turns of coil
- (D) Multi range meters inside the measurement
system
5. In a low power factor wattmeter the compensating coil is connected
- (A) In series with current coil
- (B) In parallel with current coil
- (C) In series with pressure coil
- (D) In parallel with pressure coil
6. A moving-coil permanent-magnet instrument can be used as flux-meter
- (A) By using a low resistance shunt
- (B) By using a high series resistance
- (C) By eliminating the control springs
- (D) By making control springs of large moment of
inertia
7. Which of the following are integrating instruments?
- (A) Ammeters
- (B) Voltmeters
- (C) Watt-meters
- (D) Ampere-hour and watt-hour meters
8. A Weston synchronoscope is a
- (A) Moving coil instrument
- (B) Moving iron instrument
- (C) Dynamometer instrument
- (D) None of the above
9. Wattmeter cannot be designed on the principle of
- (A) Electrostatic instrument
- (B) Thermocouple instrument
- (C) Moving iron instrument
- (D) Electrodynamic instrument
10. Which of the following meters are not used on D.C. circuits?
- (A) Mercury motor meters
- (B) Commutator motor meters
- (C) Induction meters
- (D) None of the above
11. If an inductance is connected in one arm of bridge and resistances in the remaining three arms
- (A) The bridge can always be balanced
- (B) The bridge cannot be balanced
- (C) The bridge can be balanced if the
resistances have some specific values
- (D) None of the above
12. Which of the following properties a damping oil must possess?
- (A) Must be a good insulator
- (B) Should be non-evaporating
- (C) Should not have corrosive action upon the
metal of the vane
- (D) All of the above
13. In a portable instrument, the controlling torque is provided by
- (A) Spring
- (B) Gravity
- (C) Eddy currents
- (D) All of the above
14. The adjustment of position of shading bands, in an energy meter is done to provide
- (A) Friction compensation
- (B) Creep compensation
- (C) Braking torque
- (D) None of the above
15. For measurement of inductance having high value, we should use
- (A) Maxwell's bridge
- (B) Maxwell Wien bridge
- (C) Hay's bridge
- (D) Any of the above
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