RSMSSB Junior Instructor R&AC Mechanic 2019 Paper

RSMSSB Junior Instructor Refrigeration & Air Conditioning Mechanic 2019 Paper
Exam Date – 23rd Dec 2019 Duration – 3 hours

Efficiency of cooling tower does not depends upon
(a) DBT
(b) WBT
(c) Water flow rate
(d) Type of regrigerant

Capacity of cooling tower is measured in
(a) Tons
(b) litres
(c) Litres/hour
(d) Joule

Approach in cooling tower means-
(a) difference between water outlet temperature and WBT
(b) difference between water inlet temperature and WBT
(c) difference between water outlet temperature and DBT
(d) difference between water inlet temperature and DBT

The temperature and pressure of refrigerant in condensor coil are
(a) Equal to atmospheric temperature and pressure
(b) Higher than atmospheric temperature and pressure
(c) Lower than atmospheric temperature and pressure
(d) None of the above

Fins at the condensor are provided to
(a) Decrease heat transfer rate
(b) Increase heat transfer rate
(c) Decrease pressure of refrigerant
(d) Increase pressure of refrigerant

Water cooled condensors are used in
(a) Cold storage
(b) Water cooler
(c) Split A.C. 2 ton
(d) Window A.C

In a cooling tower, water theoretically can be cooled up to
(a) Air’s WBT
(b) Air’s DBT
(c) Air’s DPT
(d) Atmospheric temperature

The fins of condenser
(a) increase heat transfer rate
(b) decreases heat transfer rate
(c) increases work input
(d) decreases COP

The process takes place in capillary tube is
(a) isothermal
(b) constant volume
(c) constant pressure
(d) throttling

Commonly used drier material in refrigeration system is
(a) sand
(b) wood
(c) cotton
(d) silica gel

Silver coating on condenser surface
(a) increases heat transfer rate
(b) decreases heat transfer rate
(c) increase friction
(d) decreases friction

Purpose of starting relay is to
(a) prevent motor damage
(b) provide starting torque to motor
(c) start motor gradually
(d) stop the motor

The shape of stator in induction motor is
(a) Cylinder
(b) Hollow cylinder
(c) Sphere
(d) Hollow sphere

Process used in summer air conditioning is
(a) cooling and humidification
(b) heating and dehumidification
(c) cooling and dehumidification
(d) cooling and adiabatic humidification