J.p.techno Instruments

Karad, Satara, Maharashtra

The apparatus consists of a variable speed D.C. Motor. Driving Pulley and Driven Pulley of equal diameters. The pulleys are mounted on input shaft (motor shaft) and output shaft. The Driven pulley can slide on the base only with bearing block to change the initial tension in belt. Brake Drum is mounted on the output shaft, which helps to measure power output. The motor speed is varied by Dimmerstat. Driving and Driven pulley speeds are indicated by a two channel digital Speed Indicator. With the help of Stroboscope it is possible to demonstrate the slip of belt on Driving and Driven Pulley.

SPECIFICATIONSD.C. Motor- 1 HP, 1500 RPM, 230V variable SpeedDriving and Driven Pulleys of equal diameters (flat pulleys)Brake Drum along with spring balance and rope arrangement is provided to load the system.Flat belts of fixed length of following belt material.Fabric BeltCanvas BeltRubber BeltBelt tightening arrangement - Bearing block is sliding and dead weight can be applied toset the initial tension in belt.Speed Indicator: Two channel digital speed indicator with switch to change the channel.

EXPERIMENTATIONSTo measure co-efficient of friction between pulley material and different belt materials To measure power transmitted with varied belt tension and plotting a graph of(T1-T2) V/S (T1+T2) i.e. "Tension Characteristics".To measure percentage slip at fixed belt tension by varying load on the Brake Drum andplot the graph of (T1-T2) V/s percentage slip i.e. Slip Characteristics. Finding a Creep Zone from graph.To measure belt slip speed and observe the limiting value of load at constant speedwhen the slip just starts. SERVICE REQUIRED-Single Phase 15amp Electrical Connection.

The JPTI unit consists of a two circular aluminium plates of identical dimensions. One of the two plates is the blackened and considered as black surface. While other plates is the test plates. Both the plates have Nichrome wire heater bound in mica sheet attached to them. Both the plates are kept in close enclosure. Supply of heat to both the plates is given by different variances measured by a voltmeter & ammeter. Heat input to both the plates can be read with the help of SPDT switches. A temperature indicator is provided to measure the temperature of both the plates. SPECIFICATIONS:-Diameter of Test Plate = 0.18 mDiameter of Black Plate = 0.18 mTemperature indicator = 0 300 0CAmmeter = 0 - 5 AVoltmeter = 0 300 VDimmerstate (2Nos.) = 1000 wattHeater = Nichrome strip wound on mica sheet.Enclosure = With one side of Acrylic sheet

FEATURES:-Emissive of a non black surface can be determined over a range of temperature.Ideal for group studies & demonstration.Panellized instruments mounted on a control panel.Easy to operate.

SERVICE REQUIRED:-Suitable bench area to mount the instrument.15 amps, Single Phase A. C. supply with earthing connection.