Which of the following problems could cause the high pressure cutout switch to shut down the compressor in a refrigeration system?

A．A shortage of liquid refrigerant.

B．Excessive frost on the evaporator.

C．Excessive condenser cooling water.

D．Insufficient condenser cooling water flow.

[单选题]Which of the following problems is the main source of fuel pump and injection system malfunctions?A．Improper lubricationB．Air in the fuel systemC．Coated fuel linesD．Excessive vibration

[单选题]Which of the following problems can occur if you continually fail to drain off condensate from a starting air receiver?A．Corrosion and eventual failure of the tankB．Gumming of the tank relief valvesC．Immediate failure of components downstream of the

[单选题]Which of the following problems should be taken when cleaning the air filter on a diesel engine equipped with a turbocharger? .A．Reduce engine speed to idle before removing the filterB．Soak the dirty filter in kerosene onlyC．Blow out the air inlet wi

[单选题]Which of the following problems may occur if the opening pressure of a fuel injection nozzle is greater than specified by the engine manufacturer?（）A . The amount of fuel injected will be increasedB . The start of injection will be retardedC . The no

[单选题]Which of the following problems can cause fluctuating pressures in the closed cooling system of a main propulsion diesel engine?（）A . Defective temperature controls in the systemB . Cavitation in the cooling water pumpC . Opened vent in the cooling s

[单选题]Which of the following could serve as an appropriate title for the passage ?A．The Theory of Division of LaborB．Adam Smith as the Discoverer of Division of LaborC．Adam Smith, the English EconomistD．Division of Labor, an Efficient Way of Organizing Wor

[单选题]Which of the following conditions could contribute to the cracking of a diesel engine cylinder head?A．Leaking seal ringB．Insufficient heat transfer from the exhaust valvesC．Blocked cooling water passages to the headD．Excessive scavenging air provided

[单选题]Which of the following conditions could cause the feed pump for an auxiliary boiler to lose suction?（）A . Increased suction head pressureB . Decreased feedwater temperatureC . Pump recirculating line being open too muchD . Excessive feedwater tempera

[单选题]5 Which of the following factors could cause a company’s gross profit percentage on sales to fall below the expectedlevel?1 Understatement of closing inventories.2 The incorrect inclusion in purchases of invoices relating to goods supplied in the fol

[单选题]Which of the following conditions can cause above normal air temperature to develop in the intake manifold of a four-stroke/cycle turbo-charged diesel engine?（）A . Clogged air intake faltersB . Piston blow-byC . A defective after-coolerD . Faulty exh