1. The meters that measure the temperature by using electrical methods are called
(A) Thermocouple
(B) Tachometers
(C) Pyrometers
(D) Thermal meters
2. The meters which can measure high temperature of a hot body without touching them are called
(A) Thermistors
(B) Bimetallic thermometers
(C) Radiation type pyrometers
(D) Contact type pyrometers
3. These meters can measure high temperature of a hot body from a distance by measuring the radiated energy of hot body
(A) Resistance type pyrometers
(B) Thermocouple type pyrometers
(C) Thermistors
(D) Radiation type pyrometers
4. The material of resistance wire in resistance type pyrometers
(A) Platinum
(B) Copper
(C) German silver
(D) Nichrome
5. Important parts of resistance pyrometers are
(A) Resistance wire and its enclosure
(B) Measuring bridge
(C) Both a & b
(D) Hot junction
6. This should be the property of resistance material used in resistance pyrometer
(A) Change in resistance per degree change in temperature should be maximum
(B) All these
(C) It should be corrosion free
(D) Change in resistance for each degree change in temperature should be the same
7. This is a disadvantage of resistance pyrometer
(A) It needs power supply
(B) All these
(C) Absolute resistance is low
(D) High cost
8. Thermocouple pyrometers can continuously be used without deterioration up to this temperature
(A) 900°C
(B) 1200°C
(C) 1500°C
(D) 1700°C
9. At high temperatures, the thermocouple of a thermocouple pyrometer is kept in
(A) Both a or b
(B) Quartz tube
(C) Porcelain tube
(D) Steel
10. This pyrometer is suitable to measure the temperature of a specific point of machine or component
(A) Resistance pyrometer
(B) All these
(C) Radiation pyrometer
(D) Thermocouple pyrometer
11. This is used to measure temperature up to 3500°C
(A) Resistance pyrometer
(B) Thermocouple pyrometer
(C) Bimetallic thermometer
(D) Radiation pyrometer
12. Lux meter is used to measure
(A) Speed
(B) Temperature
(C) Light
(D) Magnetic field
13. The instrument used to measure the light is called
(A) Lux meter
(B) Photometer
(C) All these
(D) Illumination or light meter
14. Types of optical photometers are
(A) Trotter photometer
(B) Both a & b
(C) Photovoltaic type photometer
(D) Macbeth photometer
15. In this meter, light is measured by comparing the light coming from two sources
(A) Trotter photometer
(B) Macbeth photometer
(C) Both a & b
(D) Photovoltaic type photometer
16. Trotter type photometer works on this principle
(A) None of these
(B) Inverse square law
(C) Law of heat
(D) Lambert cosine law
17. In physical photometers, a PMMC meter calibrated in lux and this cell is used
(A) Any of these
(B) Photo conductive cell
(C) Photo emissive cell
(D) Photo voltaic cell
18. In this photometer, human eye is not used to compare the light (of two sources)
(A) Photovoltaic type photometer
(B) Macbeth photometer
(C) Trotter photometer
(D) None of these
19. In photovoltaic cell, a layer of this light sensitive material is used above the iron layer
(A) Selenium
(B) Platinum
(C) Gold
(D) Copper
20. This photometer is not suitable where light changes at the rate of more than 10,000 cycle per seconds
(A) Photovoltaic type lux meter
(B) Macbeth photometer
(C) Trotter photometer
(D) None of these
21. Tachometers are used to measure
(A) Temperature
(B) Rotational speed
(C) Pressure
(D) Light
22. Tachometer may be of this type
(A) All these
(B) Electronic type
(C) Mechanical type
(D) Electromechanical type
23. This is an electrical type tachometer
(A) D.C generator type tachometer
(B) All these
(C) Eddy current type tachometer
(D) A.C generator type tachometer
24. This is not a type of electronic tachometer
(A) Toothed rotor tachometer
(B) Photo electric pickup tachometer
(C) Drag cup tachometer
(D) Stroboscopic tachometer
25. These tachometers are simple, robust, cheaper, need little repair and their output is ripple free
(A) Mechanical tachometers
(B) Eddy current tachometers
(C) Drag cup tachometers
(D) Stroboscopic tachometers
26. If a disc having white and black geometrical patterns is fixed on the rotating shaft of a motor, the patterns will appear to be stationary when
(A) Frequency of flashes will be equal to the speed of disc
(B) Frequency of flashes will be double than the speed of disc
(C) All these
(D) Frequency of flashes will be triple than the speed of disc