Measurement and Instrumentation Objective Questions Answers for Practice

76. Wattmeter cannot be designed on the principle of

1. thermocouple instrument
2. moving iron instrument
3. electrodynamic instrument
4. electrostatic instrument

77. When a capacitor was connected to the terminal of ohmmeter, the pointer indicated a low resistance initially and then slowly came to infinity position. This shows that capacitor is

1. all right
2. faulty
3. short-circuited

78. Which of the following are integrating instruments ?

1. Voltmeters
2. Wattmeters
3. Ampere-hour and watt-hour meters
4. Ammeters

79. Which of the following devices may be used for extending the range of instruments ?

1. Multipliers
2. Current transformers
3. All of the above
4. Shunts

80. Which of the following devices should be used for accurate measurement of low D.C. voltage ?

1. D.C. potentiometer
2. Small range thermocouple voltmeter
3. None of the above
4. Small range moving coil voltmeter

81. Which of the following essential features is possessed by an indicating instrument ?

1. Controlling device
2. Damping device
3. All of the above
4. Deflecting device

82. Which of the following instruments indicate the instantaneous value of the electrical quantity being measured at the time at which it is being measured ?

1. Indicating instruments
2. Recording instruments
3. Integrating instruments
4. Absolute instruments

83. Which of the following is an essential part of a motor meter ?

1. A braking device
2. Revolution registering device
3. All of the above
4. An operating torque system

84. Which of the following is measured by using a vector voltmeter ?

1. Filler transfer functions
2. Complex insersion loss
3. All of the above
4. Amplifier gain and phase shift

85. Which of the following meters are not used on D.C. circuits

1. Commutator motor meters
2. Induction meters
3. None of the above
4. Mercury motor meters

86. Which of the following properties a damping oil must possess ?

1. Should be non-evaporating
2. Should not have corrosive action upon the metal of the vane
3. All of the above
4. Must be a good insulator

87. .............instruments are those which measure the total quantity of electricity delivered in a particular time.

1. Indicating
2. Recording
3. Integrating
4. Absolute

88. A direct current can be measured by

1. a D.C. potentiometer in conjunction with a standard resistance
2. a D.C. potentiometer in conjunction with a volt ratio box
3. none of the above
4. a D.C. potentiometer directly

89. A dynamometer wattmeter can be used for

1. D.C. only
2. A.C. only
3. any of the above
4. both D.C. and A.C.

90. A moving iron instrument can be used for

1. A.C. only
2. both D.C. and A.C.
3. D.C. only