During peak load periods, the best method of controlling compressors is___________________?
(A) start-stop motor
(B) constant speed unloader
(C) relief valve
(D) variable speed
(D) none of the above
An air compressor may be controlled by____________________?
(A) throttle control
(B) clearance control
(C) blow-off control
(D) any one of the above
(D) none of the above
Separators in compressor installations are located_____________________?
(A) before intercooler
(B) after intercooler
(C) after receiver
(D) between after-cooler and air receiver
(D) before suction
In multistage compressor, the isothermal compression is achieved by_________________?
(A) employing intercooler
(B) by constantly cooling the cylinder
(C) by running compressor at very slow speed
(D) by insulating the cylinder
(D) none of the above
The capacity of compressor will be highest when its intake temperature is___________________?
(A) lowest
(B) highest
(C) anything.
(D) atmospheric
(D) none of the above
Reciprocating air compressor is best suited for___________________?
(A) large quantity of air at high pressure
(B) small quantity of air at high pressure
(C) small quantity of air at low pressure
(D) large quantity of air at low pressure
(D) any one of the above
After-cooler is used to__________________?
(A) cool the air
(B) decrease the delivery temperature for ease in handling
(C) cause moisture and oil vapour to drop out
(D) reduce volume
(D) increase pressure
Rotary compressor is best suited for_____________________?
(A) large quantity of air at high pressure
(B) small quantity of air at high pressure
(C) small quantity of air at low pressure
(D) large quantity of air at low pressure
(D) any one of the above
The volumetirc efficiency of a compressor is calculated on the basis of __________________?
(A) volume of air inhaled at working conditions
(B) volume of air inhaled at N.T.P. conditions
(C) volume at 0°C and 1 kg/cm2
(D) volume at 20°C and 1 kg/cm2
(D) none of the above
For slow-speed large capacity compressor, following type of valve will be best suited________________?
(A) poppet valve
(B) mechanical valve of the corliss, sleeve, rotary or semirotary type
(C) disc or feather type
(D) any of the above
(D) none of the above