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151.

Under which condition a material ordinatily said to be ductile undergoes a fracture similar to that of a brittle material

A.	Cyclic loading at normal temperature	B.	Long time static loading at elevated temperature
C.	Impact loading specially at low temperatures	D.	All of the above
E.	None of the above

152.

Which dynamometer will be most suitable for measuring the BHP of an automobile engine?

A.	Electrical generator type	B.	Electrical resistance type
C.	None of the above	D.	Hydraulic type

153.

In order to reverse the direction of rotation of a 3-phase induction motor

A.	Motor should eb replaced	B.	Supply voltage should be cut off in one phase
C.	Power factor should be changed	D.	All the three phases should be interchanged
E.	Any two phases should be interchanged

154.

An induction motor stator is cooled by

155.

Induction motors are generally provided with

156.

A 20 HP 1500 r.p.m. induction motor will take current of nearly

157.

The critical speed of a shaft is affected by

158.

Forced vibrations

A.	Are preceded by free vibrations	B.	Are followed by free vibrations
C.	Have a frequency more than the natural frequency	D.	Are independent of natural frequency
E.	None of the above

159.

A warm gear is generally made of

160.

While designing a warm and a worm wheel the sign should be governed by

A.	Worm	B.	Worm wheel
C.	Any one of the two	D.	Standards designs should be followed
E.	None of the above