CBSE Class-12 Question Papers for IOP/Comptt Examination 2017 : Air-Conditioning And Refrigeration

AIR-CONDITIONING AND REFRIGERATION - IV
(Theory)

Time allowed : 2 hours

Maximum Marks : 40

1. By which of the following is the capacity of an air conditioner prescribed ?
(i) By its total weight
(ii) By weight of its compressor
(iii) Heat removal per minute

2. In this air conditioner only the portion consisting of fan and evaporator is kept inside the room. Which of the following is this air conditioner ?

(i) Packaged air conditioner
(ii) Split air conditioner
(iii) Central air conditioner

3. For which of the following is a cooling coil used ?
(i) To produce cooling by evaporation of refrigerant.
(ii) To cool refrigerant vapours.
(iii) To cool the compressor.

4. In which of the following capacity are window type air conditioners usually available ?
(i) 0.5 to 1 ton
(ii) 0.5 to 1.5 ton
(iii) 2 to 2.5 ton

5. Which of the following method is preferred for direction of flow of air in conditioned space ?
(i) Towards the face of occupants
(ii) Towards the back of occupants
(iii) Towards the side of occupants

6. Which of the following is the total heat being extracted from the conditioned space ?
(i) Cooling load
(ii) Product load
(iii) Freezing load

7. Which type of element from the following is a solenoid valve ?
(i) Sensing element
(ii) Actuating element
(iii) Measuring element

8. Which of the following is not a safety device ?
(i) HP and LP cut outs
(ii) Motor relays
(iii) Capillary tube

9. Which of the following is not a refrigerant flow control device ?
(i) Solenoid valve
(ii) Thermostatic valve
(iii) Capillary tube
(iv) Bulb and Bellow

10. Which of the following is a modulating motor ?
(i) Reversible motor capable of stopping and holding at any position.
(ii) Single phase induction motor.
(iii) 3-phase induction motor.

11. Air-conditioning is sometimes carried out at partial load. Which of the following methods is adopted for this ?
(i) Bypass control
(ii) Stopping the plant in between
(iii) Allowing outside air to enter conditioned space

12. Which of the following is not a motor relay ?
(i) Current relay
(ii) Voltage relay
(iii) Thermal relay
(iv) Spring relay

13. Strips of two different metals joined together are used in which of the following elements ?
(i) Thermostatic element
(ii) Electric resistance element
(iii) Electromagnetic element

14. For which of the following is a thermostatic expansion valve used ?
(i) To regulate amount of refrigerant as per temperature and pressure
(ii) To control pressure of regulator
(iii) To control temperature of compressor

15. Which of the following can be the cause in a refrigerator for not producing cold even when it is running ?
(i) Shortage of refrigerant
(ii) Faulty capacitor
(iii) Less pressure of compressor

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Courtesy: CBSE