Measurement and Instrumentation Quiz | Measurement and Instrumentation Online Test for Practice

31. In order to achieve high accuracy, the slide wire of a potentiometer should be

1. as long as possible
2. as short as possible
3. neither too small not too large
4. very thick

32. In Weston synchronoscope the moving coil is connected across

1. bus-bars
2. incoming alternator
3. fixed coils
4. any of the above

33. Induction type single phase energy meters measure electric energy in

1. kW
2. Wh
3. kWh
4. VAR

34. Instrument transformers are

1. potential transformers
2. current transformers
3. both a and b
4. power transformers

35. is an instrument which measures the insulation resistance of an electric circuit relative to earth and one another

1. Tangent galvanometer
2. Meggar
3. Current transformer
4. None of the above

36. It is required to measure the true open circuit e.m.f. of a battery. The best device is

1. D.C. voltmeter
2. Ammeter and a known resistance
3. D.C. potentiometer
4. None of the above

37. Most common form of A.C. meters met with in every day domestic and industrial installations are

1. mercury motor meters
2. commutator motor meters
3. induction type single phase energy meters
4. all of the above

38. Most sensitive galvanometer is

1. elastic galvanometer
2. vibration galvanometer
3. Duddlb galvanometer
4. spot ballistic galvanometer

39. Murray loop test can be used for location of

1. ground fault on a cable
2. short circuit fault on a cable
3. both the ground fault and the short-circuit fault
4. none of the above

40. Operating torques in analogue instruments are

1. deflecting and control
2. deflecting and damping
3. deflecting, control and damping
4. vibration and balancing

41. Resistances can be measured with the help of

1. wattmeters
2. voltmeters
3. ammeters
4. ohmmeters and resistance bridges

42. Standard resistor is made from

1. platinum
2. maganin
3. silver
4. nichrome

43. Systematic errors are

1. instrumental errors
2. environmental errors
3. observational errors
4. all of the above

44. The adjustment of position of shading bands, in an energy meter is done to provide

1. friction compensation
2. creep compensation
3. braking torque
4. none of the above

45. The chemical effect of current is used in

1. D.C. ammeter hour meter
2. D.C. ammeter
3. D.C. energy meter
4. none of the above