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Questions in engineering

[Done] Select the best answer for the question. 16. All AC equipment is designed to operate at voltages within A. 10 B. 15 C. 25 D. 20 percent of its rated power.

[Done] If gear A has 50 teeth and runs at 40 rpm and is used in driving gear B with 25 teeth, at what speed will gear B be moving?

[Done] Choose all options that apply. Which factors most directly affect the maximum allowable pressure drop within a system? a) Type of refrigerant b) Gas velocity c) Temperature of the refrigerant d) Pipe size

[Done] Select the best answer for the question. 18. How is the minimum circuit ampacity for an air-conditioning condensing unit calculated? A. Compressor amps [tex]\times[/tex] fan amps B. ([tex]Compressor amps + fan amps) \times 1.25[/tex] C. Compressor amps + fan amps D. ([tex]Compressor amps \times 1.25[/tex])+ fan amps

[Done] Which of the following is the best definition of a vehicle's axle group spread? A. The distance separating two axles or axle groups calculated from the centres of the two adjacent axles B. The distance between the centre of the front axle (or front axle group) to the centre of rear axle group on either your tractor or trailer C. The distance between the axles within an axle group and is measured from the centre of the first axle to the centre of the rear axle in the group

[Done] Choose all options that apply. Which of the following uses of soldering are approved in the HVAC industry? a) Joining refrigerant lines b) Joining copper pipes used for water c) Joining combustible gas lines d) Joining electrical wiring

[Done] What happens when you slide the rear trailer axle to the rear? A. Weight is shifted from the rear axle to the drive axle B. Weight is shifted from the drive axle to the rear axle C. Weight is shifted from the steer axle to the drive axle

[Done] What must a technician do before connecting gauges to charge liquid refrigerant? a) Subtract the tare weight from the cylinder weight. b) Add the refrigerant. c) Find the tare weight of an empty cylinder. d) Weigh the cylinder. e) Close the service valve.

[Done] Where can you add the vapor refrigerant in non-operating systems? A. The charging device B. The low-pressure side C. The refrigerant cylinder D. The high-pressure side

[Done] (c) A separately excited d.c motor with a reactive feedback diode across it is fed from a [tex]$240 V, 50 Hz$[/tex] a.c supply through a single phase half-controlled bridge rectifier. The armature inductance and resistance are 0.06 H and [tex]$6 \Omega$[/tex] respectively. If the firing delay angle is [tex]$80^{\circ}$[/tex] and motor back e.m.f is 150 V , determine the mean input voltage of the d.c motor.