Question: Depending on the radiating properties, a body will be opaque when _________________?

• 1. p = 0, x = 0 and a = 1
• 2. p=l,x = 0anda = 0
• 3. p = 0, x = 1 and a = 0
• 4. x – 0, a + p = 1

Question: According to Wien’s law, the wavelength corresponding to maximum energy is proportion to ________________?

• 1. absolute temperature (T)
• 2. I2
• 3. f
• 4. t

Question: According to fan laws, at constant speed and capacity, the pressure and power vary_____________________?

• 1. directly as the air or gas density
• 2. inversely as square root of density
• 3. inversely as density
• 4. as square of density

Question: Maximum impulse will be developed in hydraulic ram when ___________________?

• 1. waste valve closes suddenly
• 2. supply pipe is long
• 3. supply pipe is short
• 4. ram chamber is large

Question: A hydraulic intensifier normally consists of __________________?

• 1. two cylinders, two rams and a storage device
• 2. a cylinder and a ram
• 3. two co-axial rams and two cylinders
• 4. a cylinder, a piston, storage tank and control valve

Question: Hydraulic accumulator is used for____________________?

• 1. accumulating oil
• 2. supplying large quantities of oil for very short duration
• 3. generally high pressures to operate hydraulic machines
• 4. supplying energy when main supply fails

Question: Puck up the wrong statement about centrifugal pump_______________?

• 1. discharge a diameter
• 2. head a speed2
• 3. head a diameter
• 4. Power a speed3

Question: Saving of work done and power by fitting an air vessel to double acting reciprocating pump is of the order of_______________?

• 1. 39.2%
• 2. 49.2%
• 3. 68.8%
• 4. 84.8%

Question: A hydraulic accumulator normally consists of________________?

• 1. two cylinders, two rams and a storage device
• 2. a cylinder and a ram
• 3. two co-axial rams and two cylinders
• 4. a cylinder, a piston, storage tank and control valve

Question: According to fan laws, at constant weight of air or gas, the speed, capacity and pressure vary________________?

• 1. directly as the air or gas density
• 2. inversely as square root of density
• 3. inversely as density
• 4. as square of density