The indicated mean effective pressure of an engine is obtained from the indicator diagram drawn with the help of an engine indicator.

Find the friction mean effective pressure of an engine having brake mean effective pressure 25 Hp and indicated mean effective pressure 30 Hp.

A

5.0 Hp

B

5.5 Hp

C

5.3 Hp

D

5.4 Hp

Which of the following relation between indicated mean effective pressure (imep), brake mean effective pressure (bmep) and friction mean effective power (fmep) is correct?

A

imep = fmep + bmep

B

imep = fmep * bmep

C

imep = fmep – bmep

D

imep = fmep / bmep

Consider the following statements with respect to flow diagram in work-study: 1. Movement of machines is drawn in flow diagram. 2. Movement of men is drawn in flow diagram. 3. In flow diagram, all movements are drawn true to scale. Which of the above statements are correct?

A

1 and 2 only

B

1 and 3 only

C

2 and 3 only

D

1, 2 and 3

Which of the following options are correct? 1. Three carbon atom is indicated by 'prop'. 2. Four carbon atom is indicated by 'but'. 3. Seven carbon atom is indicated by 'Hex'. 4. Nine carbon atom is indicated by 'Non'.

A

Only 1 & 2 are correct

B

Only 2 & 3 are correct

C

Only 1, 2 & 4 are correct

D

All are correct

Which of the following is correct? (Where pa = Actual mean effective pressure, pm = Theoretical mean effective pressure, and K = Diagram factor)

A

pa = pm/K

B

pa = pm × K

C

pa = K/pm

D

pa = pm + K

Which of the following is correct?
(Where pa = Actual mean effective pressure, pm = Theoretical mean effective pressure and K = Diagram factor)

A

$${\text{pa}} = \frac{{{\text{pm}}}}{{\text{K}}}$$

B

$${\text{pa}} = {\text{pm}} \times {\text{K}}$$

C

$${\text{pa}} = \frac{{\text{K}}}{{{\text{pm}}}}$$

D

$${\text{pa}} = {\text{pm}} + {\text{K}}$$

Which of the following remarks pertaining to supercharging of IC engines are correct? 1. Ideal supercharging increases the output, but decreases the thermal efficiency slightly 2. The indicated mean effective pressure and mechanical efficiency increase with supercharging 3. The permissible amount of supercharging depends on the compression ratio, air-fuel mixture and design of engine 4. Engine friction losses increase with supercharging

A

1, 2, 3 and 4

B

1, 2 and 3 only

C

1, 2 and 4 only

D

2, 3 and 4 only

The indicated power of a four stroke engine (in watts) is equal to (where P = Mean effective pressure in N/m², L = Length of stroke in metres, A = Cross-sectional area of the piston in m², and N = Speed of the engine in revolutions per second (r.p.s)

A

P.L.A.N/2

B

P.L.A.N

C

2 × P.L.A.N

D

P.L.A.N/4

The indicated power of a four stroke engine (in watts) is equal to (where P = Mean effective pressure in N/m², L = Length of stroke in metres, A = Cross-sectional area of the piston in m² and N = Speed of the engine in revolutions per second (r.p.s)

A

$$\frac{{{\text{P}}{\text{.L}}{\text{.A}}{\text{.N}}{\text{.}}}}{2}$$

B

P.L.A.N.

C

2 × P.L.A.N.

D

$$\frac{{{\text{P}}{\text{.L}}{\text{.A}}{\text{.N}}{\text{.}}}}{4}$$

The mean effective pressure obtained from engine indicator indicates the

A

Maximum pressure developed

B

Minimum pressure

C

Instantaneous pressure at any instant

D

Average pressure

The indicated mean effective pressure of an engine is obtained from the indicator diagram drawn with the help of an engine indicator.

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