Rajasthan Polytechnic Third Year Paper 2016 – Modern R.A.C Practices

Rajasthan Polytechnic Third Year Paper 2016 – Modern R.A.C Practices

The following is used for refrigerant charging in a refrigeration system
(a) Oil separator
(b) Ball valve
(c) Two way service valve
(d) Balancing valve

The strainer is used in refrigeration system
(a) to absorb moisture
(b) to prevent dust particles
(c) to prevent liquid refrigerant
(d) to balance pressure

The oil separator is fitted
(a) after Evaporator
(b) after Compressor
(c) after Condenser
(d) after expansion valve

The no. of pressure dial gauge in a gauge manifold are
(a) one
(b) two
(c) three
(d) four

The main function of oil separator is
(a) strain the oil to remove dust particles
(b) to absorb moisture
(c) to separate oil form refrigerant
(d) to separate oil from cooled air

Thermostatic expansion valve works on
(a) the change in pressure in the evaporator
(b) the change in temperature in the evaporator
(c) the change in volume in the evaporator
(d) the change in the degree of superheat at the exit from evaporator

In which type of evaporator, thermostatic expansion valve is used?
(a) Flooded
(b) DX coil
(c) Dry
(d) DX coil & Dry

Which one material is not used for Ammonia expansion valve?
(a) Copper
(b) Aluminium
(c) Steel
(d) None of these

The working principle of solenoid valve is based on
(a) electromagnetic
(b) electrostatic
(c) electronics
(d) electrical

Which type motor is used in a electronic expansion valve?
(a) Direct Current motor
(b) Synchronous
(c) Induction motor
(d) Step motor