Questions and answers for exam Preparation

MCQs

Total Questions : 543 | Page 26 of 55 pages

Question 251. The steering of a ship means

Movement of a complete ship up and down in vertical plane about transverse axis
Turning of a complete ship in a curve towards right or left, while it moves forward
Rolling of a complete ship sideways
None of the above

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Answer: Option B. -> Turning of a complete ship in a curve towards right or left, while it moves forward

Question 252. In a reciprocating steam engine, when the crank has turned from inner dead center through an angle $$\theta $$, the angular velocity of the connecting rod is given by

$$\frac{{\omega \,\sin \theta }}{{{{\left( {{{\text{n}}^2} - {{\sin }^2}\theta } \right)}^{\frac{1}{2}}}}}$$
$$\frac{{\omega \,\cos\theta }}{{{{\left( {{{\text{n}}^2} - {{\cos }^2}\theta } \right)}^{\frac{1}{2}}}}}$$
$$\frac{{\omega \,\sin \theta }}{{{{\left( {{{\text{n}}^2} - {{\cos }^2}\theta } \right)}^{\frac{1}{2}}}}}$$
$$\frac{{\omega \,\cos\theta }}{{{{\left( {{{\text{n}}^2} - {{\sin }^2}\theta } \right)}^{\frac{1}{2}}}}}$$

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Answer: Option D. -> $$\frac{{\omega \,\cos\theta }}{{{{\left( {{{\text{n}}^2} - {{\sin }^2}\theta } \right)}^{\frac{1}{2}}}}}$$

Question 253. In its simplest form, a cam mechanism consists of following number of links

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Answer: Option C. -> 3

Question 254. The Klein's diagram is used when

Crank has uniform angular velocity
Crank has nonuniform angular velocity
Crank has uniform angular acceleration
Crank has nonuniform angular acceleration

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Answer: Option A. -> Crank has uniform angular velocity

Question 255. The radius of a friction circle for a shaft rotating inside a bearing is (where r = Radius of shaft and $$\tan \varphi $$ = Coefficient of friction between the shaft and bearing)

$${\text{r}}\sin \varphi $$
$${\text{r}}\cos \varphi $$
$${\text{r}}\tan \varphi $$
$$\frac{{\text{r}}}{2}\cos \varphi $$

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Answer: Option A. -> $${\text{r}}\sin \varphi $$

Question 256. Two heavy rotating masses are connected by shafts of lengths $${l_1},\,{l_2}$$ and $${l_3}$$ and the corresponding diameters are d1, d2 and d3. This system is reduced to a torsionally equivalent system having uniform diameter d = d1 of the shaft. The equivalent length of the shaft is

$$\frac{{{l_1} + {l_2} + {l_3}}}{3}$$
$${l_1} + {l_2}{\left( {\frac{{{{\text{d}}_1}}}{{{{\text{d}}_2}}}} \right)^3} + {l_3}{\left( {\frac{{{{\text{d}}_1}}}{{{{\text{d}}_3}}}} \right)^3}$$
$${l_1} + {l_2}{\left( {\frac{{{{\text{d}}_1}}}{{{{\text{d}}_2}}}} \right)^4} + {l_3}{\left( {\frac{{{{\text{d}}_1}}}{{{{\text{d}}_3}}}} \right)^4}$$
$${l_1} + {l_2} + {l_3}$$

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Answer: Option C. -> $${l_1} + {l_2}{\left( {\frac{{{{\text{d}}_1}}}{{{{\text{d}}_2}}}} \right)^4} + {l_3}{\left( {\frac{{{{\text{d}}_1}}}{{{{\text{d}}_3}}}} \right)^4}$$

Question 257. The method of obtaining different mechanisms by fixing in turn different links in a kinematic chain, is known as

Structure
Machine
Inversion
Compound mechanism

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Answer: Option C. -> Inversion

Question 258. Any point on a link connecting double slider crank chain will trace a

Straight line
Circle
Ellipse
Parabola

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Answer: Option C. -> Ellipse

Question 259. Hammer blow

Is the maximum horizontal unbalanced force caused by the mass provided to balance the reciprocating masses.
Is the maximum vertical unbalanced force caused by the mass added to balance the reciprocating masses
Varies as the square root of the speed
Varies inversely with the square of the speed

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Answer: Option B. -> Is the maximum vertical unbalanced force caused by the mass added to balance the reciprocating masses

Question 260. The instantaneous centers which vary with the configuration of mechanism are called