Engineering Answers

TASK 3 

Task 3 requires you to carry out a full risk assessment on a typical item or area from your selected working environment with which you are familiar with. You need to include all the hazards identified in task 2 and also use the Health and Safety `five steps to risk assessment’ procedures to complete this task. 

                                                This task provides evidence for grading criterion P6. 

TASK 4 

1. This task requires you to suggest suitable control measures for the risks identified in your risk assessment in task 3 and state the reasons why they are suitable. 

1. For each of the control measures identified in Task 4a describe how the control measures can prevent accidents. 

TASK 3 

Task 3 requires you to carry out a full risk assessment on a typical item or area from your selected working environment with which you are familiar with. You need to include all the hazards identified in task 2 and also use the Health and Safety `five steps to risk assessment’ procedures to complete this task. 

Task4

A) This task requires you to suggest suitable control measures for the risks identified in your risk assessment in task 3 and state the reasons why they are suitable. 

B) For each of the control measures identified in Task 4a describe how the control measures can prevent accidents. 

Describe the methods used to identify the health and safety hazards that may be present in the working environment with which you are familiar.  

Photographic evidence is required to show the hazards identified. 

You need to identify the waste materials generated from your selected working environment and explain the requirements for the safe disposal of these waste materials. 

A 1hp, DC shunt motor is loaded by a constant torque of 20Nm. The armature resistance

of the motor is 4Ω, and the field constant K=2.5Vsec. the motor is driven by a full-wave

SCR converter. The power source is 200V, 60Hz. The triggering angle of the converter is

60 and the conduction period is 150. Calculate the motor speed and the developed

power.

A 150V, DC shunt motor drives a constant-torque load at a speed of 1500rpm. The

armature and field resistances are 2Ω and 150Ω, respectively. The motor draws a line

current of 10A at the given load.

(a) Calculate the resistance that should be added to the armature circuit to reduce the

speed by 50%.

(b) Assume the rotational losses to be 100W. calculate the efficiency of the motor without

and with the added resistance.

(c) Calculate the resistance that must be added to the armature circuit to operate the

motor at the holding condition

A 150V, DC shunt motor drives a constant-torque load at a speed of 1500rpm. The

armature and field resistances are 2Ω and 150Ω, respectively. The motor draws a line

current of 10A. Assume that a resistance is added in the field circuit to reduce the field

current by 25%. Calculate the armature current, motor speed, value of the added

resistance and extra field losses.

A 200V DC shunt motor drives a constant-torque load at a speed of 1800rpm. The

armature & field resistance is 2Ω and 120Ω respectively. The motor draws a line current

of 10A. Assume that a resistance is added in the field circuit to reduce the field current by

20%. Calculate armature current, motor speed and value of the added resistance and

extra field losses.

A 500V, DC shunt motor has armature and field resistance of 2.5Ω and 500Ω respectively.

When the motor run unloaded, the line current is 3A and the speed is 1200rpm. Calculate

torque Developed at full load armature current of 50A, the motor speed if the load is

constant-torque type when 3Ω resistance is added to the armature circuit and the motor

speed if the field is reduced by 15%.

Weim (R = 0.4968 Btu/lbmoR) is compressed isothermally from 14.7 psia 68°F. The compression ratio is 4. Calculate the work done by the gas.