Which of the following motors is used in a situation where load increases with speed ?

Which one of the following is not necessarily the advantage of D.C. motors over A.C. motors?

A

Low cost

B

Wide speed range

C

Stability

D

High starting torque

When the axis of load lies in the plane of rivet group, then the most heavily loaded rivet will be the one which (where, Fa is the load shared by each rivet due to axial load and Fm is the shearing load due to moment in any rivet.)

A

Is at the maximum distance from CG of the rivet group

B

Is at the minimum distance from CG of the rivet group

C

Gives the maximum angle between the two forces Fa and Fm

D

Gives the minimum angle between the two forces Fa and Fm

In testing a pile by load test, pile platform is loaded with one and half times the design load and a maximum settlement is noted. The load is gradually removed and the consequent rebound is measured. For a safe pile, the net settlement (i.e. total settlement minus rebound) per tonne of test load should not exceed

A

10 mm

B

15 mm

C

20 mm

D

25 mm

People speculate when they consider a situation and assume something to be true based on inconclusive evidence. Which situation below is the best example of Speculation ?

A

Francine decides that it would be appropriate to wear jeans to her new office on Friday after reading about "Casual Fridays" in her employee handbook.

B

Mary spends thirty minutes sitting in traffic and wishes that she took the train instead of driving.

C

After consulting several guidebooks and her travel agent, Jennifer feels confident that the hotel she has chosen is first-rate.

D

When Emily opens the door in tears, Theo guesses that she's had a death in her family.

The school principal has received complaints from parents about bullying in the school yard during recess. He wants to investigate and end this situation as soon as possible, so he has asked the recess aides to watch closely. Which situation should the recess aides report to the principal?

A

A girl is sitting glumly on a bench reading a book and not interacting with her peers.

B

Four girls are surrounding another girl and seem to have possession of her backpack.

C

Two boys are playing a one-on-one game of basketball and are arguing over the last basket scored.

D

Three boys are huddled over a handheld video game, which isn't supposed to be on school grounds.

Which of the following motors always starts on load?

A

Conveyor motor

B

Floor mill motor

C

Fan motor

D

All of the above

In D.C. shunt motors as load is reduced

A

The speed will increase abruptly

B

The speed will increase in proportion to reduction in load

C

The speed will remain almost/constant

D

The speed will reduce

The mechanical displacement of the rotor with respect to the stator, in polyphase multipolar synchronous motors running at full load, is of the order of

A

zero degree

B

two degrees

C

five degrees

D

ten degrees

The standard full-load power factor ratings for synchronous motors are

A

zero or 0.8 leading

B

unity or 0.8 lagging

C

unity or 0.8 leading

D

unity or zero

When the load on the engine increases, it becomes necessary to increase the supply of working fluid and when the load decreases, less working fluid is required. The supply of the working fluid to the engine is controlled by a

A

D-slide valve

B

governor

C

Meyer’s expansion valve

D

flywheel

Which of the following motors is used in a situation where load increases with speed ?

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