The notch sensitivity q is expressed in terms of fatigue stress concentration factor K<sub>f</sub> and theoretical stress concentration factor K<sub>t</sub> as

The notch sensitivity q is expressed in terms of fatigue stress concentration factor Kf and theoretical stress concentration factor Kt as

A

$$\frac{{{{\text{K}}_{\text{f}}} + 1}}{{{{\text{K}}_{\text{t}}} + 1}}$$

B

$$\frac{{{{\text{K}}_{\text{f}}} - 1}}{{{{\text{K}}_{\text{t}}} - 1}}$$

C

$$\frac{{{{\text{K}}_{\text{t}}} + 1}}{{{{\text{K}}_{\text{f}}} + 1}}$$

D

$$\frac{{{{\text{K}}_{\text{t}}} - 1}}{{{{\text{K}}_{\text{f}}} - 1}}$$

The material does not experience any reduction in the fatigue strength from the notch. The value of notch sensitivity factor (q) for this material will be equal to ___________

A

q=0

B

q=infinite

C

q=1

D

q=0.5

The material does not experience any reduction in the fatigue strength from the notch. The value of fatigue notch factor (Kf) for this material will be equal to ________

A

Kf=0

B

Kf=1

C

Kf=0.5

D

Kf=infinite

Consider a measuring system consisting of a sensor, an amplifier and an oscilloscope. The sensitivity of each equipment is as follows : Sensor sensitivity : 0.4 mV/°C, Amplifier gain : 5.0 V/mV, and Oscilloscope sensitivity : 10 mV/V. What is the sensitivity of complete measurement system ?

A

5.0 V/mV

B

10 mV/V

C

15.4 mV/°C

D

20 mV/°C

The stress concentration is generally expressed by a theoretical stress-concentration factor kt. Generally, Kt is described as the ratio of _________________

A

σmax / σmin

B

σmin/ σmax

C

σmax/σnominal

D

σnominal/σmax

The discharge over a rectangular notch is (where b = Width of notch, and H = Height of liquid, above the sill of the notch)

A

(2/3) Cd × b × √(2gH)

B

(2/3) Cd × b × √(2g) × H

C

(2/3) Cd × b × √(2g) × H3/2

D

(2/3) Cd × b × √(2g) × H2

The discharge over a rectangular notch is (where b = Width of notch and H = Height of liquid, above the sill of the notch)

A

$$\frac{2}{3}{{\text{C}}_{\text{d}}} \times {\text{b}}\sqrt {2{\text{gH}}} $$

B

$$\frac{2}{3}{{\text{C}}_{\text{d}}} \times {\text{b}}\sqrt {2{\text{g}}} \times {\text{H}}$$

C

$$\frac{2}{3}{{\text{C}}_{\text{d}}} \times {\text{b}}\sqrt {2{\text{g}}} \times {{\text{H}}^{\frac{3}{2}}}$$

D

$$\frac{2}{3}{{\text{C}}_{\text{d}}} \times {\text{b}}\sqrt {2{\text{g}}} \times {{\text{H}}^2}$$

The discharge over the trapezoidal notch is equal to the discharge over the rectangular notch __________ the discharge over the triangular notch.

A

Plus

B

Minus

C

Divide

D

None of these

If the sample is tested for a large number of cycles below its fatigue limit and the stress is gradually increased above the fatigue limit, the true fatigue limit of material will _______

A

improve

B

worsen

C

no effect

D

cannot say

The design stress, which is more than the damaging stress, is the least unit stress that will render a member unfit for service before the end of its normal life. The design stress factor or factor of safety indicates the margin between design stress and the __________ stress.

A

Working

B

Damaging

C

Allowable

D

None of these

The notch sensitivity q is expressed in terms of fatigue stress concentration factor K_f and theoretical stress concentration factor K_t as

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