129) What will happen to rotor copper loss if the frequency of the input to an induction motor increases?

Increases

Decreases

Remains same

None of these

Answer is:

Increases

OFB Chargeman Mechanical Question Paper - 2014 with Answer Key

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130) Which of the following is not a part of squirrel case induction motor?

Rotor

Stator

Carbon brushes

Shaft

Answer is:

Carbon brushes

131) Direct on-line starters are not suitable for starting large D.C. motors because

The motor may not start

Large voltage drop may occur in the supply mains

The starting torque becomes very low

The motor may run away

Answer is:

Large voltage drop may occur in the supply mains

132) Broadly speaking, water is

10 times more compressible than steel

80 times more compressible than steel

80 times less compressible than steel

800 times less compressible than steel

Answer is:

80 times more compressible than steel

133) Cavitation will begin when

Pressure at any location reaches pressure equal to the saturated vapour pressure of the liquid

Pressure becomes more than critical pressure

Flow is increased

Pressure is increased

Answer is:

Pressure at any location reaches pressure equal to the saturated vapour pressure of the liquid

OFB Chargeman Mechanical Question Paper - 2014 with Answer Key

For more MCQ's Click Here

129) What will happen to rotor copper loss if the frequency of the input to an induction motor increases?

Increases

OFB Chargeman Mechanical Question Paper - 2014 with Answer Key

Related OFB Chargeman Mechanical Question Paper - 2014 with Answer Key

130) Which of the following is not a part of squirrel case induction motor?

Carbon brushes

131) Direct on-line starters are not suitable for starting large D.C. motors because

Large voltage drop may occur in the supply mains

132) Broadly speaking, water is

80 times more compressible than steel

133) Cavitation will begin when

Pressure at any location reaches pressure equal to the saturated vapour pressure of the liquid

OFB Chargeman Mechanical Question Paper - 2014 with Answer Key