Engineering

ISBT Engineering for all banking PO,Clerk,IBPS PO,Railway,SSC,IAS,OAS Exams

Q21.	Which of the following is indicate the symbol of P-N diode ?

1)	a	2)	b
3)	c	4)	d
5)	None of these

Q22.	At the time of discharging the battery converts ?

1)	Mechanical energy into electrical energy.	2)	Electrical energy into chemical energy.
3)	Chemical energy into mechanical energy.	4)	Chemical energy into electrical energy.
5)	None of these

Q23.	What is the condition of perfect truss ?

1)	n = 2j - 2	2)	n = 2j - 3
3)	n = 2j -4	4)	n = 2j - 5
5)	None of these

Q24.	A soil sample has specific gravity of 2.60 and a void ratio of 0.78. What should be the percentage  of water required to fully saturate the soil at the void ratio ?

1)	12	2)	16
3)	30	4)	40
5)	None of these

Q25.	The valves mounted on the boilers which change the direction of flow of steam by 90° and valves fitted in the pipelines which allow the steam in the same direction are respectively called as _____.

1)	Stop valves and junction valves	2)	Junction valves and stop valves
3)	Junction valves and safety valves	4)	Feed safety valves and stop valves
5)	None of these

Q26.	The engine oil at 150 °C is cooled to 80 °C in a parallel flow heat exchange by water entering at 25 °C and leaving at 60 °C. What will be the exchange effectiveness will be _____.

1)	0.36	2)	0.46
3)	0.56	4)	0.66
5)	None of these

Q27.	The amount of heat required to raise the temperature of 1 kg of water from 0°C to the saturation temperature Ts °C at a given constant pressure is defined as _____.

1)	Super-heat	2)	Entropy
3)	Latent heat	4)	Sensible heat
5)	None of these

Q28.	Which of the following is the chief advantage of die casting ?

1)	possibility of incorporating thick sections in small castings	2)	casting of inserts is possible
3)	wide tolerances are possible	4)	high production rates are possible
5)	None of these

Q29.	If carbon present in cast iron is partly free and partly in combined state, it is called _____.

1)	White cast iron	2)	Grey cast iron
3)	Molten cast iron	4)	None of these
5)	None of these

Q30.

1)	R1	2)	R2
3)	R3	4)	R4
5)	None of these