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